release: v1.2.0

### Explanation

_No response_

### Issue

Closes #102

### Attestations

- [ ] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [ ] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [ ] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

- [ ] I have run the linter and resolved any errors.
- [ ] My pull request uses an appropriate title, matching the conventional commit standards.
- [ ] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

### Documentation

_No response_

### Versioning

_No response_

Reviewed-on: #103
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

.gitea/workflows/ci.yml

@@ -49,13 +49,13 @@ jobs:
       - name: Run Svelte Check
         run: pnpm check
 
-      - name: Run frontend tests
+      - name: Run frontend tests with coverage
-        run: pnpm test
+        run: pnpm test:coverage
 
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          components: clippy
+          components: clippy, llvm-tools-preview
 
       - name: Cache Rust dependencies
         uses: actions/cache@v4
@@ -68,13 +68,16 @@ jobs:
             src-tauri/target/
           key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
+      - name: Install cargo-llvm-cov
+        run: cargo install cargo-llvm-cov --locked
+
       - name: Run Clippy
         working-directory: src-tauri
         run: cargo clippy --all-targets --all-features -- -D warnings
 
-      - name: Run Rust tests
+      - name: Run Rust tests with coverage
         working-directory: src-tauri
-        run: cargo test
+        run: cargo llvm-cov --fail-under-lines 50
 
   build-linux:
     name: Build Linux

.gitignore

@@ -8,3 +8,6 @@ node_modules
 !.env.example
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
+
+# Coverage reports
+/coverage

README.md

@@ -1 +1,29 @@
-tem
+# hikari-desktop
+
+Desktop companion application featuring Hikari.
+
+## Live Version
+
+This page is currently deployed. [View the live website.](https://git.nhcarrigan.com/nhcarrigan/hikari-desktop/releases)
+
+## Feedback and Bugs
+
+If you have feedback or a bug report, please [log a ticket on our forum](https://support.nhcarrigan.com).
+
+## Contributing
+
+If you would like to contribute to the project, you may create a Pull Request containing your proposed changes and we will review it as soon as we are able! Please review our [contributing guidelines](CONTRIBUTING.md) first.
+
+## Code of Conduct
+
+Before interacting with our community, please read our [Code of Conduct](CODE_OF_CONDUCT.md).
+
+## License
+
+This software is licensed under our [global software license](https://docs.nhcarrigan.com/#/license).
+
+Copyright held by Naomi Carrigan.
+
+## Contact
+
+We may be contacted through our [Chat Server](http://chat.nhcarrigan.com) or via email at `contact@nhcarrigan.com`

RELEASE_NOTES_v0.3.0.md

@@ -1,74 +0,0 @@
-# Hikari Desktop v0.3.0 Release Notes
-
-## New Features
-
-### AskUserQuestion Tool Support (#51)
-
-- Claude can now ask you questions with multiple choice options during conversations
-- A dedicated modal appears with answer choices and support for custom responses
-- Answers are seamlessly integrated back into the conversation context
-
-### Slash Commands
-
-- `/cd <path>` - Change the working directory while preserving conversation context (#55)
-- `/search <query>` - Search and highlight matches within the conversation (#32)
-- `/skill <name> [data]` - Invoke Claude Code skills from `~/.claude/skills/` (#57)
-- `/new`, `/clear`, `/rename`, `/help` commands for conversation management (#6)
-
-### Auto-Update Checker (#17)
-
-- Automatically checks for new releases on startup
-- Notification appears when a newer version is available
-- Can be disabled in settings
-
-### Font Size & Zoom (#19)
-
-- Adjust font size with keyboard shortcuts: `Ctrl++`, `Ctrl+-`, `Ctrl+0`
-- Font size slider in settings (10-24px range)
-- Preference persists between sessions
-
-### Resizable Character Panel (#10)
-
-- Drag the divider between the character panel and terminal to resize
-- Panel width is saved and restored on app restart
-- Sprite now uses full height for better proportions
-
-### Input History Navigation (#13)
-
-- Use up/down arrows to navigate through previous messages and commands
-- Arrow keys only navigate history when input is empty - otherwise they move the cursor (#58)
-
-### Keyboard Shortcuts (#21)
-
-- `Ctrl+N` - New conversation
-- `Ctrl+W` - Close current tab
-- `Ctrl+Tab` / `Ctrl+Shift+Tab` - Switch between tabs
-- `Ctrl+L` - Clear conversation
-- `Ctrl+,` - Open settings
-
-### Always On Top Toggle (#28)
-
-- Pin the window to stay above other applications
-- Toggle in settings
-
-## Improvements
-
-### UI/UX
-
-- Resizable chat input with drag handle (expands upward)
-- Send button properly aligned with input field
-- Markdown rendering with syntax-highlighted code blocks (#31, #33)
-- Light mode text colors improved for better readability
-- Scroll position persists per conversation tab when switching
-- Confirmation modal when closing connected tabs
-- Links in chat now open in default browser (#54)
-- Spaces allowed when renaming tabs (#52)
-
-### State Management
-
-- Stats (tokens, cost) persist across session changes and only reset on disconnect (#59)
-- Multiple tabs can now request permissions simultaneously without conflicts
-
-## Closed Issues
-
-#6, #10, #13, #17, #19, #21, #28, #31, #32, #33, #51, #52, #54, #55, #57, #58, #59

eslint.config.js

@@ -27,6 +27,6 @@ export default tseslint.config(
     },
   },
   {
-    ignores: ["build/", ".svelte-kit/", "dist/", "src-tauri/target/", "node_modules/"],
+    ignores: ["build/", ".svelte-kit/", "dist/", "src-tauri/target/", "node_modules/", "coverage/"],
   }
 );

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hikari-desktop",
-  "version": "0.3.0",
+  "version": "1.2.0",
   "description": "",
   "type": "module",
   "scripts": {
@@ -16,6 +16,10 @@
     "test": "vitest run",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
+    "test:backend": "cd src-tauri && cargo test",
+    "test:backend:coverage": "cd src-tauri && cargo llvm-cov --text",
+    "test:all": "pnpm test && pnpm test:backend",
+    "coverage:all": "pnpm test:coverage && pnpm test:backend:coverage",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "format": "prettier --write .",
@@ -23,6 +27,32 @@
   },
   "license": "MIT",
   "dependencies": {
+    "@codemirror/commands": "6.8.1",
+    "@codemirror/lang-angular": "^0.1.4",
+    "@codemirror/lang-cpp": "^6.0.3",
+    "@codemirror/lang-css": "^6.3.1",
+    "@codemirror/lang-go": "^6.0.1",
+    "@codemirror/lang-html": "^6.4.11",
+    "@codemirror/lang-java": "^6.0.2",
+    "@codemirror/lang-javascript": "^6.2.4",
+    "@codemirror/lang-json": "^6.0.2",
+    "@codemirror/lang-less": "^6.0.2",
+    "@codemirror/lang-markdown": "^6.5.0",
+    "@codemirror/lang-php": "^6.0.2",
+    "@codemirror/lang-python": "^6.2.1",
+    "@codemirror/lang-rust": "^6.0.2",
+    "@codemirror/lang-sass": "^6.0.2",
+    "@codemirror/lang-sql": "^6.10.0",
+    "@codemirror/lang-vue": "^0.1.3",
+    "@codemirror/lang-wast": "^6.0.2",
+    "@codemirror/lang-xml": "^6.1.0",
+    "@codemirror/lang-yaml": "^6.1.2",
+    "@codemirror/language": "^6.12.1",
+    "@codemirror/legacy-modes": "^6.5.2",
+    "@codemirror/state": "^6.5.4",
+    "@codemirror/theme-one-dark": "^6.1.3",
+    "@codemirror/view": "^6.39.11",
+    "@lezer/highlight": "^1.2.3",
     "@tauri-apps/api": "^2",
     "@tauri-apps/plugin-clipboard-manager": "^2.3.2",
     "@tauri-apps/plugin-dialog": "^2",
@@ -32,6 +62,7 @@
     "@tauri-apps/plugin-os": "^2",
     "@tauri-apps/plugin-shell": "^2.3.4",
     "@tauri-apps/plugin-store": "^2",
+    "codemirror": "^6.0.2",
     "highlight.js": "^11.11.1",
     "marked": "^17.0.1"
   },
@@ -44,6 +75,7 @@
     "@tauri-apps/cli": "^2",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/svelte": "^5.3.1",
+    "@vitest/coverage-v8": "^4.0.18",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-svelte": "^3.14.0",

pnpm-lock.yaml

@@ -8,6 +8,84 @@ importers:
 
   .:
     dependencies:
+      '@codemirror/commands':
+        specifier: 6.8.1
+        version: 6.8.1
+      '@codemirror/lang-angular':
+        specifier: ^0.1.4
+        version: 0.1.4
+      '@codemirror/lang-cpp':
+        specifier: ^6.0.3
+        version: 6.0.3
+      '@codemirror/lang-css':
+        specifier: ^6.3.1
+        version: 6.3.1
+      '@codemirror/lang-go':
+        specifier: ^6.0.1
+        version: 6.0.1
+      '@codemirror/lang-html':
+        specifier: ^6.4.11
+        version: 6.4.11
+      '@codemirror/lang-java':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-javascript':
+        specifier: ^6.2.4
+        version: 6.2.4
+      '@codemirror/lang-json':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-less':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-markdown':
+        specifier: ^6.5.0
+        version: 6.5.0
+      '@codemirror/lang-php':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-python':
+        specifier: ^6.2.1
+        version: 6.2.1
+      '@codemirror/lang-rust':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-sass':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-sql':
+        specifier: ^6.10.0
+        version: 6.10.0
+      '@codemirror/lang-vue':
+        specifier: ^0.1.3
+        version: 0.1.3
+      '@codemirror/lang-wast':
+        specifier: ^6.0.2
+        version: 6.0.2
+      '@codemirror/lang-xml':
+        specifier: ^6.1.0
+        version: 6.1.0
+      '@codemirror/lang-yaml':
+        specifier: ^6.1.2
+        version: 6.1.2
+      '@codemirror/language':
+        specifier: ^6.12.1
+        version: 6.12.1
+      '@codemirror/legacy-modes':
+        specifier: ^6.5.2
+        version: 6.5.2
+      '@codemirror/state':
+        specifier: ^6.5.4
+        version: 6.5.4
+      '@codemirror/theme-one-dark':
+        specifier: ^6.1.3
+        version: 6.1.3
+      '@codemirror/view':
+        specifier: ^6.39.11
+        version: 6.39.11
+      '@lezer/highlight':
+        specifier: ^1.2.3
+        version: 1.2.3
       '@tauri-apps/api':
         specifier: ^2
         version: 2.9.1
@@ -35,6 +113,9 @@ importers:
       '@tauri-apps/plugin-store':
         specifier: ^2
         version: 2.4.2
+      codemirror:
+        specifier: ^6.0.2
+        version: 6.0.2
       highlight.js:
         specifier: ^11.11.1
         version: 11.11.1
@@ -66,6 +147,9 @@ importers:
       '@testing-library/svelte':
         specifier: ^5.3.1
         version: 5.3.1(svelte@5.46.3)(vite@6.4.1(jiti@2.6.1)(lightningcss@1.30.2))(vitest@4.0.17(jiti@2.6.1)(jsdom@27.4.0)(lightningcss@1.30.2))
+      '@vitest/coverage-v8':
+        specifier: ^4.0.18
+        version: 4.0.18(vitest@4.0.17(jiti@2.6.1)(jsdom@27.4.0)(lightningcss@1.30.2))
       eslint:
         specifier: ^9.39.2
         version: 9.39.2(jiti@2.6.1)
@@ -130,14 +214,115 @@ packages:
     resolution: {integrity: sha512-JYgintcMjRiCvS8mMECzaEn+m3PfoQiyqukOMCCVQtoJGYJw8j/8LBJEiqkHLkfwCcs74E3pbAUFNg7d9VNJ+Q==}
     engines: {node: '>=6.9.0'}
 
+  '@babel/helper-string-parser@7.27.1':
+    resolution: {integrity: sha512-qMlSxKbpRlAridDExk92nSobyDdpPijUq2DW6oDnUqd0iOGxmQjyqhMIihI9+zv4LPyZdRje2cavWPbCbWm3eA==}
+    engines: {node: '>=6.9.0'}
+
   '@babel/helper-validator-identifier@7.28.5':
     resolution: {integrity: sha512-qSs4ifwzKJSV39ucNjsvc6WVHs6b7S03sOh2OcHF9UHfVPqWWALUsNUVzhSBiItjRZoLHx7nIarVjqKVusUZ1Q==}
     engines: {node: '>=6.9.0'}
 
+  '@babel/parser@7.28.6':
+    resolution: {integrity: sha512-TeR9zWR18BvbfPmGbLampPMW+uW1NZnJlRuuHso8i87QZNq2JRF9i6RgxRqtEq+wQGsS19NNTWr2duhnE49mfQ==}
+    engines: {node: '>=6.0.0'}
+    hasBin: true
+
   '@babel/runtime@7.28.6':
     resolution: {integrity: sha512-05WQkdpL9COIMz4LjTxGpPNCdlpyimKppYNoJ5Di5EUObifl8t4tuLuUBBZEpoLYOmfvIWrsp9fCl0HoPRVTdA==}
     engines: {node: '>=6.9.0'}
 
+  '@babel/types@7.28.6':
+    resolution: {integrity: sha512-0ZrskXVEHSWIqZM/sQZ4EV3jZJXRkio/WCxaqKZP1g//CEWEPSfeZFcms4XeKBCHU0ZKnIkdJeU/kF+eRp5lBg==}
+    engines: {node: '>=6.9.0'}
+
+  '@bcoe/v8-coverage@1.0.2':
+    resolution: {integrity: sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==}
+    engines: {node: '>=18'}
+
+  '@codemirror/autocomplete@6.20.0':
+    resolution: {integrity: sha512-bOwvTOIJcG5FVo5gUUupiwYh8MioPLQ4UcqbcRf7UQ98X90tCa9E1kZ3Z7tqwpZxYyOvh1YTYbmZE9RTfTp5hg==}
+
+  '@codemirror/commands@6.8.1':
+    resolution: {integrity: sha512-KlGVYufHMQzxbdQONiLyGQDUW0itrLZwq3CcY7xpv9ZLRHqzkBSoteocBHtMCoY7/Ci4xhzSrToIeLg7FxHuaw==}
+
+  '@codemirror/lang-angular@0.1.4':
+    resolution: {integrity: sha512-oap+gsltb/fzdlTQWD6BFF4bSLKcDnlxDsLdePiJpCVNKWXSTAbiiQeYI3UmES+BLAdkmIC1WjyztC1pi/bX4g==}
+
+  '@codemirror/lang-cpp@6.0.3':
+    resolution: {integrity: sha512-URM26M3vunFFn9/sm6rzqrBzDgfWuDixp85uTY49wKudToc2jTHUrKIGGKs+QWND+YLofNNZpxcNGRynFJfvgA==}
+
+  '@codemirror/lang-css@6.3.1':
+    resolution: {integrity: sha512-kr5fwBGiGtmz6l0LSJIbno9QrifNMUusivHbnA1H6Dmqy4HZFte3UAICix1VuKo0lMPKQr2rqB+0BkKi/S3Ejg==}
+
+  '@codemirror/lang-go@6.0.1':
+    resolution: {integrity: sha512-7fNvbyNylvqCphW9HD6WFnRpcDjr+KXX/FgqXy5H5ZS0eC5edDljukm/yNgYkwTsgp2busdod50AOTIy6Jikfg==}
+
+  '@codemirror/lang-html@6.4.11':
+    resolution: {integrity: sha512-9NsXp7Nwp891pQchI7gPdTwBuSuT3K65NGTHWHNJ55HjYcHLllr0rbIZNdOzas9ztc1EUVBlHou85FFZS4BNnw==}
+
+  '@codemirror/lang-java@6.0.2':
+    resolution: {integrity: sha512-m5Nt1mQ/cznJY7tMfQTJchmrjdjQ71IDs+55d1GAa8DGaB8JXWsVCkVT284C3RTASaY43YknrK2X3hPO/J3MOQ==}
+
+  '@codemirror/lang-javascript@6.2.4':
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+
+  '@codemirror/lang-json@6.0.2':
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+
+  '@codemirror/lang-php@6.0.2':
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+
+  '@codemirror/lang-python@6.2.1':
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+
+  '@codemirror/theme-one-dark@6.1.3':
+    resolution: {integrity: sha512-NzBdIvEJmx6fjeremiGp3t/okrLPYT0d9orIc7AFun8oZcRk58aejkqhv6spnz4MLAevrKNPMQYXEWMg4s+sKA==}
+
+  '@codemirror/view@6.39.11':
+    resolution: {integrity: sha512-bWdeR8gWM87l4DB/kYSF9A+dVackzDb/V56Tq7QVrQ7rn86W0rgZFtlL3g3pem6AeGcb9NQNoy3ao4WpW4h5tQ==}
+
   '@csstools/color-helpers@5.1.0':
     resolution: {integrity: sha512-S11EXWJyy0Mz5SYvRmY8nJYTFFd1LCNV+7cXyAgQtOOuzb4EsgfqDufL+9esx72/eLhsRdGZwaldu/h+E4t4BA==}
     engines: {node: '>=18'}
@@ -405,6 +590,60 @@ packages:
   '@jridgewell/trace-mapping@0.3.31':
     resolution: {integrity: sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==}
 
+  '@lezer/common@1.5.0':
+    resolution: {integrity: sha512-PNGcolp9hr4PJdXR4ix7XtixDrClScvtSCYW3rQG106oVMOOI+jFb+0+J3mbeL/53g1Zd6s0kJzaw6Ri68GmAA==}
+
+  '@lezer/cpp@1.1.5':
+    resolution: {integrity: sha512-DIhSXmYtJKLehrjzDFN+2cPt547ySQ41nA8yqcDf/GxMc+YM736xqltFkvADL2M0VebU5I+3+4ks2Vv+Kyq3Aw==}
+
+  '@lezer/css@1.3.0':
+    resolution: {integrity: sha512-pBL7hup88KbI7hXnZV3PQsn43DHy6TWyzuyk2AO9UyoXcDltvIdqWKE1dLL/45JVZ+YZkHe1WVHqO6wugZZWcw==}
+
+  '@lezer/go@1.0.1':
+    resolution: {integrity: sha512-xToRsYxwsgJNHTgNdStpcvmbVuKxTapV0dM0wey1geMMRc9aggoVyKgzYp41D2/vVOx+Ii4hmE206kvxIXBVXQ==}
+
+  '@lezer/highlight@1.2.3':
+    resolution: {integrity: sha512-qXdH7UqTvGfdVBINrgKhDsVTJTxactNNxLk7+UMwZhU13lMHaOBlJe9Vqp907ya56Y3+ed2tlqzys7jDkTmW0g==}
+
+  '@lezer/html@1.3.13':
+    resolution: {integrity: sha512-oI7n6NJml729m7pjm9lvLvmXbdoMoi2f+1pwSDJkl9d68zGr7a9Btz8NdHTGQZtW2DA25ybeuv/SyDb9D5tseg==}
+
+  '@lezer/java@1.1.3':
+    resolution: {integrity: sha512-yHquUfujwg6Yu4Fd1GNHCvidIvJwi/1Xu2DaKl/pfWIA2c1oXkVvawH3NyXhCaFx4OdlYBVX5wvz2f7Aoa/4Xw==}
+
+  '@lezer/javascript@1.5.4':
+    resolution: {integrity: sha512-vvYx3MhWqeZtGPwDStM2dwgljd5smolYD2lR2UyFcHfxbBQebqx8yjmFmxtJ/E6nN6u1D9srOiVWm3Rb4tmcUA==}
+
+  '@lezer/json@1.0.3':
+    resolution: {integrity: sha512-BP9KzdF9Y35PDpv04r0VeSTKDeox5vVr3efE7eBbx3r4s3oNLfunchejZhjArmeieBH+nVOpgIiBJpEAv8ilqQ==}
+
+  '@lezer/lr@1.4.8':
+    resolution: {integrity: sha512-bPWa0Pgx69ylNlMlPvBPryqeLYQjyJjqPx+Aupm5zydLIF3NE+6MMLT8Yi23Bd9cif9VS00aUebn+6fDIGBcDA==}
+
+  '@lezer/markdown@1.6.3':
+    resolution: {integrity: sha512-jpGm5Ps+XErS+xA4urw7ogEGkeZOahVQF21Z6oECF0sj+2liwZopd2+I8uH5I/vZsRuuze3OxBREIANLf6KKUw==}
+
+  '@lezer/php@1.0.5':
+    resolution: {integrity: sha512-W7asp9DhM6q0W6DYNwIkLSKOvxlXRrif+UXBMxzsJUuqmhE7oVU+gS3THO4S/Puh7Xzgm858UNaFi6dxTP8dJA==}
+
+  '@lezer/python@1.1.18':
+    resolution: {integrity: sha512-31FiUrU7z9+d/ElGQLJFXl+dKOdx0jALlP3KEOsGTex8mvj+SoE1FgItcHWK/axkxCHGUSpqIHt6JAWfWu9Rhg==}
+
+  '@lezer/rust@1.0.2':
+    resolution: {integrity: sha512-Lz5sIPBdF2FUXcWeCu1//ojFAZqzTQNRga0aYv6dYXqJqPfMdCAI0NzajWUd4Xijj1IKJLtjoXRPMvTKWBcqKg==}
+
+  '@lezer/sass@1.1.0':
+    resolution: {integrity: sha512-3mMGdCTUZ/84ArHOuXWQr37pnf7f+Nw9ycPUeKX+wu19b7pSMcZGLbaXwvD2APMBDOGxPmpK/O6S1v1EvLoqgQ==}
+
+  '@lezer/xml@1.0.6':
+    resolution: {integrity: sha512-CdDwirL0OEaStFue/66ZmFSeppuL6Dwjlk8qk153mSQwiSH/Dlri4GNymrNWnUmPl2Um7QfV1FO9KFUyX3Twww==}
+
+  '@lezer/yaml@1.0.3':
+    resolution: {integrity: sha512-GuBLekbw9jDBDhGur82nuwkxKQ+a3W5H0GfaAthDXcAu+XdpS43VlnxA9E9hllkpSP5ellRDKjLLj7Lu9Wr6xA==}
+
+  '@marijn/find-cluster-break@1.0.2':
+    resolution: {integrity: sha512-l0h88YhZFyKdXIFNfSWpyjStDjGHwZ/U7iobcK1cQQD8sejsONdQtTVU+1wVN1PBw40PiiHB1vA5S7VTfQiP9g==}
+
   '@polka/url@1.0.0-next.29':
     resolution: {integrity: sha512-wwQAWhWSuHaag8c4q/KN/vCoeOJYshAIvMQwD4GpSb3OiZklFfvAgmj0VCBBImRpuF/aFgIRzllXlVX93Jevww==}
 
@@ -869,6 +1108,15 @@ packages:
     resolution: {integrity: sha512-LZ2NqIHFhvFwxG0qZeLL9DvdNAHPGCY5dIRwBhyYeU+LfLhcStE1ImjsuTG/WaVh3XysGaeLW8Rqq7cGkPCFvw==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
 
+  '@vitest/coverage-v8@4.0.18':
+    resolution: {integrity: sha512-7i+N2i0+ME+2JFZhfuz7Tg/FqKtilHjGyGvoHYQ6iLV0zahbsJ9sljC9OcFcPDbhYKCet+sG8SsVqlyGvPflZg==}
+    peerDependencies:
+      '@vitest/browser': 4.0.18
+      vitest: 4.0.18
+    peerDependenciesMeta:
+      '@vitest/browser':
+        optional: true
+
   '@vitest/expect@4.0.17':
     resolution: {integrity: sha512-mEoqP3RqhKlbmUmntNDDCJeTDavDR+fVYkSOw8qRwJFaW/0/5zA9zFeTrHqNtcmwh6j26yMmwx2PqUDPzt5ZAQ==}
 
@@ -886,6 +1134,9 @@ packages:
   '@vitest/pretty-format@4.0.17':
     resolution: {integrity: sha512-Ah3VAYmjcEdHg6+MwFE17qyLqBHZ+ni2ScKCiW2XrlSBV4H3Z7vYfPfz7CWQ33gyu76oc0Ai36+kgLU3rfF4nw==}
 
+  '@vitest/pretty-format@4.0.18':
+    resolution: {integrity: sha512-P24GK3GulZWC5tz87ux0m8OADrQIUVDPIjjj65vBXYG17ZeU3qD7r+MNZ1RNv4l8CGU2vtTRqixrOi9fYk/yKw==}
+
   '@vitest/runner@4.0.17':
     resolution: {integrity: sha512-JmuQyf8aMWoo/LmNFppdpkfRVHJcsgzkbCA+/Bk7VfNH7RE6Ut2qxegeyx2j3ojtJtKIbIGy3h+KxGfYfk28YQ==}
 
@@ -898,6 +1149,9 @@ packages:
   '@vitest/utils@4.0.17':
     resolution: {integrity: sha512-RG6iy+IzQpa9SB8HAFHJ9Y+pTzI+h8553MrciN9eC6TFBErqrQaTas4vG+MVj8S4uKk8uTT2p0vgZPnTdxd96w==}
 
+  '@vitest/utils@4.0.18':
+    resolution: {integrity: sha512-msMRKLMVLWygpK3u2Hybgi4MNjcYJvwTb0Ru09+fOyCXIgT5raYP041DRRdiJiI3k/2U6SEbAETB3YtBrUkCFA==}
+
   acorn-jsx@5.3.2:
     resolution: {integrity: sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==}
     peerDependencies:
@@ -941,6 +1195,9 @@ packages:
     resolution: {integrity: sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA==}
     engines: {node: '>=12'}
 
+  ast-v8-to-istanbul@0.3.10:
+    resolution: {integrity: sha512-p4K7vMz2ZSk3wN8l5o3y2bJAoZXT3VuJI5OLTATY/01CYWumWvwkUw0SqDBnNq6IiTO3qDa1eSQDibAV8g7XOQ==}
+
   axobject-query@4.1.0:
     resolution: {integrity: sha512-qIj0G9wZbMGNLjLmg1PT6v2mE9AH2zlnADJD/2tC6E00hgmhUOfEB6greHPAfLRSufHqROIUTkw6E+M3lH0PTQ==}
     engines: {node: '>= 0.4'}
@@ -977,6 +1234,9 @@ packages:
     resolution: {integrity: sha512-eYm0QWBtUrBWZWG0d386OGAw16Z995PiOVo2B7bjWSbHedGl5e0ZWaq65kOGgUSNesEIDkB9ISbTg/JK9dhCZA==}
     engines: {node: '>=6'}
 
+  codemirror@6.0.2:
+    resolution: {integrity: sha512-VhydHotNW5w1UGK0Qj96BwSk/Zqbp9WbnyK2W/eVMv4QyF41INRGpjUhFJY7/uDNuudSc33a/PKr4iDqRduvHw==}
+
   color-convert@2.0.1:
     resolution: {integrity: sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==}
     engines: {node: '>=7.0.0'}
@@ -991,6 +1251,9 @@ packages:
     resolution: {integrity: sha512-U71cyTamuh1CRNCfpGY6to28lxvNwPG4Guz/EVjgf3Jmzv0vlDp1atT9eS5dDjMYHucpHbWns6Lwf3BKz6svdw==}
     engines: {node: '>= 0.6'}
 
+  crelt@1.0.6:
+    resolution: {integrity: sha512-VQ2MBenTq1fWZUH9DJNGti7kKv6EeAuYr3cLwxUWhIu1baTaXh4Ib5W2CqHVqib4/MqbYGJqiL3Zb8GJZr3l4g==}
+
   cross-spawn@7.0.6:
     resolution: {integrity: sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==}
     engines: {node: '>= 8'}
@@ -1211,6 +1474,9 @@ packages:
     resolution: {integrity: sha512-CV9TW3Y3f8/wT0BRFc1/KAVQ3TUHiXmaAb6VW9vtiMFf7SLoMd1PdAc4W3KFOFETBJUb90KatHqlsZMWV+R9Gg==}
     engines: {node: ^20.19.0 || ^22.12.0 || >=24.0.0}
 
+  html-escaper@2.0.2:
+    resolution: {integrity: sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==}
+
   http-proxy-agent@7.0.2:
     resolution: {integrity: sha512-T1gkAiYYDWYx3V5Bmyu7HcfcvL7mUrTWiM6yOfa3PIphViJ/gFPbvidQ+veqSOHci/PxBcDabeUNCzpOODJZig==}
     engines: {node: '>= 14'}
@@ -1256,6 +1522,18 @@ packages:
   isexe@2.0.0:
     resolution: {integrity: sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==}
 
+  istanbul-lib-coverage@3.2.2:
+    resolution: {integrity: sha512-O8dpsF+r0WV/8MNRKfnmrtCWhuKjxrq2w+jpzBL5UZKTi2LeVWnWOmWRxFlesJONmc+wLAGvKQZEOanko0LFTg==}
+    engines: {node: '>=8'}
+
+  istanbul-lib-report@3.0.1:
+    resolution: {integrity: sha512-GCfE1mtsHGOELCU8e/Z7YWzpmybrx/+dSTfLrvY8qRmaY6zXTKWn6WQIjaAFw069icm6GVMNkgu0NzI4iPZUNw==}
+    engines: {node: '>=10'}
+
+  istanbul-reports@3.2.0:
+    resolution: {integrity: sha512-HGYWWS/ehqTV3xN10i23tkPkpH46MLCIMFNCaaKNavAXTF1RkqxawEPtnjnGZ6XKSInBKkiOA5BKS+aZiY3AvA==}
+    engines: {node: '>=8'}
+
   jiti@2.6.1:
     resolution: {integrity: sha512-ekilCSN1jwRvIbgeg/57YFh8qQDNbwDb9xT/qu2DAHbFFZUicIl4ygVaAvzveMhMVr3LnpSKTNnwt8PoOfmKhQ==}
     hasBin: true
@@ -1263,6 +1541,9 @@ packages:
   js-tokens@4.0.0:
     resolution: {integrity: sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==}
 
+  js-tokens@9.0.1:
+    resolution: {integrity: sha512-mxa9E9ITFOt0ban3j6L5MpjwegGz6lBQmM1IJkWeBZGcMxto50+eWdjC/52xDbS2vy0k7vIMK0Fe2wfL9OQSpQ==}
+
   js-yaml@4.1.1:
     resolution: {integrity: sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==}
     hasBin: true
@@ -1394,6 +1675,13 @@ packages:
   magic-string@0.30.21:
     resolution: {integrity: sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==}
 
+  magicast@0.5.1:
+    resolution: {integrity: sha512-xrHS24IxaLrvuo613F719wvOIv9xPHFWQHuvGUBmPnCA/3MQxKI3b+r7n1jAoDHmsbC5bRhTZYR77invLAxVnw==}
+
+  make-dir@4.0.0:
+    resolution: {integrity: sha512-hXdUTZYIVOt1Ex//jAQi+wTZZpUpwBj/0QsOzqegb3rGMMeJiSEu5xLHnYfBrRV4RH2+OCSOO95Is/7x1WJ4bw==}
+    engines: {node: '>=10'}
+
   marked@17.0.1:
     resolution: {integrity: sha512-boeBdiS0ghpWcSwoNm/jJBwdpFaMnZWRzjA6SkUMYb40SVaN1x7mmfGKp0jvexGcx+7y2La5zRZsYFZI6Qpypg==}
     engines: {node: '>= 20'}
@@ -1600,6 +1888,9 @@ packages:
     resolution: {integrity: sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==}
     engines: {node: '>=8'}
 
+  style-mod@4.1.3:
+    resolution: {integrity: sha512-i/n8VsZydrugj3Iuzll8+x/00GH2vnYsk1eomD8QiRrSAeW6ItbCQDtfXCeJHd0iwiNagqjQkvpvREEPtW3IoQ==}
+
   supports-color@7.2.0:
     resolution: {integrity: sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==}
     engines: {node: '>=8'}
@@ -1779,6 +2070,9 @@ packages:
       jsdom:
         optional: true
 
+  w3c-keyname@2.2.8:
+    resolution: {integrity: sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==}
+
   w3c-xmlserializer@5.0.0:
     resolution: {integrity: sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==}
     engines: {node: '>=18'}
@@ -1869,10 +2163,233 @@ snapshots:
       js-tokens: 4.0.0
       picocolors: 1.1.1
 
+  '@babel/helper-string-parser@7.27.1': {}
+
   '@babel/helper-validator-identifier@7.28.5': {}
 
+  '@babel/parser@7.28.6':
+    dependencies:
+      '@babel/types': 7.28.6
+
   '@babel/runtime@7.28.6': {}
 
+  '@babel/types@7.28.6':
+    dependencies:
+      '@babel/helper-string-parser': 7.27.1
+      '@babel/helper-validator-identifier': 7.28.5
+
+  '@bcoe/v8-coverage@1.0.2': {}
+
+  '@codemirror/autocomplete@6.20.0':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+
+  '@codemirror/commands@6.8.1':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+
+  '@codemirror/lang-angular@0.1.4':
+    dependencies:
+      '@codemirror/lang-html': 6.4.11
+      '@codemirror/lang-javascript': 6.2.4
+      '@codemirror/language': 6.12.1
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@codemirror/lang-cpp@6.0.3':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@lezer/cpp': 1.1.5
+
+  '@codemirror/lang-css@6.3.1':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/css': 1.3.0
+
+  '@codemirror/lang-go@6.0.1':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/go': 1.0.1
+
+  '@codemirror/lang-html@6.4.11':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/lang-css': 6.3.1
+      '@codemirror/lang-javascript': 6.2.4
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+      '@lezer/css': 1.3.0
+      '@lezer/html': 1.3.13
+
+  '@codemirror/lang-java@6.0.2':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@lezer/java': 1.1.3
+
+  '@codemirror/lang-javascript@6.2.4':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/lint': 6.9.3
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+      '@lezer/javascript': 1.5.4
+
+  '@codemirror/lang-json@6.0.2':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@lezer/json': 1.0.3
+
+  '@codemirror/lang-less@6.0.2':
+    dependencies:
+      '@codemirror/lang-css': 6.3.1
+      '@codemirror/language': 6.12.1
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@codemirror/lang-markdown@6.5.0':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/lang-html': 6.4.11
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+      '@lezer/markdown': 1.6.3
+
+  '@codemirror/lang-php@6.0.2':
+    dependencies:
+      '@codemirror/lang-html': 6.4.11
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/php': 1.0.5
+
+  '@codemirror/lang-python@6.2.1':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/python': 1.1.18
+
+  '@codemirror/lang-rust@6.0.2':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@lezer/rust': 1.0.2
+
+  '@codemirror/lang-sass@6.0.2':
+    dependencies:
+      '@codemirror/lang-css': 6.3.1
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/sass': 1.1.0
+
+  '@codemirror/lang-sql@6.10.0':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@codemirror/lang-vue@0.1.3':
+    dependencies:
+      '@codemirror/lang-html': 6.4.11
+      '@codemirror/lang-javascript': 6.2.4
+      '@codemirror/language': 6.12.1
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@codemirror/lang-wast@6.0.2':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@codemirror/lang-xml@6.1.0':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+      '@lezer/xml': 1.0.6
+
+  '@codemirror/lang-yaml@6.1.2':
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+      '@lezer/yaml': 1.0.3
+
+  '@codemirror/language@6.12.1':
+    dependencies:
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+      style-mod: 4.1.3
+
+  '@codemirror/legacy-modes@6.5.2':
+    dependencies:
+      '@codemirror/language': 6.12.1
+
+  '@codemirror/lint@6.9.3':
+    dependencies:
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      crelt: 1.0.6
+
+  '@codemirror/search@6.6.0':
+    dependencies:
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      crelt: 1.0.6
+
+  '@codemirror/state@6.5.4':
+    dependencies:
+      '@marijn/find-cluster-break': 1.0.2
+
+  '@codemirror/theme-one-dark@6.1.3':
+    dependencies:
+      '@codemirror/language': 6.12.1
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+      '@lezer/highlight': 1.2.3
+
+  '@codemirror/view@6.39.11':
+    dependencies:
+      '@codemirror/state': 6.5.4
+      crelt: 1.0.6
+      style-mod: 4.1.3
+      w3c-keyname: 2.2.8
+
   '@csstools/color-helpers@5.1.0': {}
 
   '@csstools/css-calc@2.1.4(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)':
@@ -2051,6 +2568,101 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.5
 
+  '@lezer/common@1.5.0': {}
+
+  '@lezer/cpp@1.1.5':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/css@1.3.0':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/go@1.0.1':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/highlight@1.2.3':
+    dependencies:
+      '@lezer/common': 1.5.0
+
+  '@lezer/html@1.3.13':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/java@1.1.3':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/javascript@1.5.4':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/json@1.0.3':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/lr@1.4.8':
+    dependencies:
+      '@lezer/common': 1.5.0
+
+  '@lezer/markdown@1.6.3':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+
+  '@lezer/php@1.0.5':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/python@1.1.18':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/rust@1.0.2':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/sass@1.1.0':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/xml@1.0.6':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@lezer/yaml@1.0.3':
+    dependencies:
+      '@lezer/common': 1.5.0
+      '@lezer/highlight': 1.2.3
+      '@lezer/lr': 1.4.8
+
+  '@marijn/find-cluster-break@1.0.2': {}
+
   '@polka/url@1.0.0-next.29': {}
 
   '@rollup/rollup-android-arm-eabi@4.55.1':
@@ -2469,6 +3081,20 @@ snapshots:
       '@typescript-eslint/types': 8.53.0
       eslint-visitor-keys: 4.2.1
 
+  '@vitest/coverage-v8@4.0.18(vitest@4.0.17(jiti@2.6.1)(jsdom@27.4.0)(lightningcss@1.30.2))':
+    dependencies:
+      '@bcoe/v8-coverage': 1.0.2
+      '@vitest/utils': 4.0.18
+      ast-v8-to-istanbul: 0.3.10
+      istanbul-lib-coverage: 3.2.2
+      istanbul-lib-report: 3.0.1
+      istanbul-reports: 3.2.0
+      magicast: 0.5.1
+      obug: 2.1.1
+      std-env: 3.10.0
+      tinyrainbow: 3.0.3
+      vitest: 4.0.17(jiti@2.6.1)(jsdom@27.4.0)(lightningcss@1.30.2)
+
   '@vitest/expect@4.0.17':
     dependencies:
       '@standard-schema/spec': 1.1.0
@@ -2490,6 +3116,10 @@ snapshots:
     dependencies:
       tinyrainbow: 3.0.3
 
+  '@vitest/pretty-format@4.0.18':
+    dependencies:
+      tinyrainbow: 3.0.3
+
   '@vitest/runner@4.0.17':
     dependencies:
       '@vitest/utils': 4.0.17
@@ -2508,6 +3138,11 @@ snapshots:
       '@vitest/pretty-format': 4.0.17
       tinyrainbow: 3.0.3
 
+  '@vitest/utils@4.0.18':
+    dependencies:
+      '@vitest/pretty-format': 4.0.18
+      tinyrainbow: 3.0.3
+
   acorn-jsx@5.3.2(acorn@8.15.0):
     dependencies:
       acorn: 8.15.0
@@ -2541,6 +3176,12 @@ snapshots:
 
   assertion-error@2.0.1: {}
 
+  ast-v8-to-istanbul@0.3.10:
+    dependencies:
+      '@jridgewell/trace-mapping': 0.3.31
+      estree-walker: 3.0.3
+      js-tokens: 9.0.1
+
   axobject-query@4.1.0: {}
 
   balanced-match@1.0.2: {}
@@ -2573,6 +3214,16 @@ snapshots:
 
   clsx@2.1.1: {}
 
+  codemirror@6.0.2:
+    dependencies:
+      '@codemirror/autocomplete': 6.20.0
+      '@codemirror/commands': 6.8.1
+      '@codemirror/language': 6.12.1
+      '@codemirror/lint': 6.9.3
+      '@codemirror/search': 6.6.0
+      '@codemirror/state': 6.5.4
+      '@codemirror/view': 6.39.11
+
   color-convert@2.0.1:
     dependencies:
       color-name: 1.1.4
@@ -2583,6 +3234,8 @@ snapshots:
 
   cookie@0.6.0: {}
 
+  crelt@1.0.6: {}
+
   cross-spawn@7.0.6:
     dependencies:
       path-key: 3.1.1
@@ -2823,6 +3476,8 @@ snapshots:
     transitivePeerDependencies:
       - '@exodus/crypto'
 
+  html-escaper@2.0.2: {}
+
   http-proxy-agent@7.0.2:
     dependencies:
       agent-base: 7.1.4
@@ -2864,10 +3519,25 @@ snapshots:
 
   isexe@2.0.0: {}
 
+  istanbul-lib-coverage@3.2.2: {}
+
+  istanbul-lib-report@3.0.1:
+    dependencies:
+      istanbul-lib-coverage: 3.2.2
+      make-dir: 4.0.0
+      supports-color: 7.2.0
+
+  istanbul-reports@3.2.0:
+    dependencies:
+      html-escaper: 2.0.2
+      istanbul-lib-report: 3.0.1
+
   jiti@2.6.1: {}
 
   js-tokens@4.0.0: {}
 
+  js-tokens@9.0.1: {}
+
   js-yaml@4.1.1:
     dependencies:
       argparse: 2.0.1
@@ -2986,6 +3656,16 @@ snapshots:
     dependencies:
       '@jridgewell/sourcemap-codec': 1.5.5
 
+  magicast@0.5.1:
+    dependencies:
+      '@babel/parser': 7.28.6
+      '@babel/types': 7.28.6
+      source-map-js: 1.2.1
+
+  make-dir@4.0.0:
+    dependencies:
+      semver: 7.7.3
+
   marked@17.0.1: {}
 
   mdn-data@2.12.2: {}
@@ -3172,6 +3852,8 @@ snapshots:
 
   strip-json-comments@3.1.1: {}
 
+  style-mod@4.1.3: {}
+
   supports-color@7.2.0:
     dependencies:
       has-flag: 4.0.0
@@ -3331,6 +4013,8 @@ snapshots:
       - tsx
       - yaml
 
+  w3c-keyname@2.2.8: {}
+
   w3c-xmlserializer@5.0.0:
     dependencies:
       xml-name-validator: 5.0.0

src-tauri/Cargo.lock

@@ -1602,7 +1602,7 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hikari-desktop"
-version = "0.3.0"
+version = "1.1.1"
 dependencies = [
  "chrono",
  "parking_lot",

src-tauri/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "hikari-desktop"
-version = "0.3.0"
+version = "1.2.0"
 description = "Hikari - Claude Code Visual Assistant"
 authors = ["Naomi Carrigan"]
 edition = "2021"

src-tauri/src/bridge_manager.rs

@@ -3,6 +3,7 @@ use std::collections::HashMap;
 use std::sync::Arc;
 use tauri::AppHandle;
 
+use crate::commands::record_session;
 use crate::config::ClaudeStartOptions;
 use crate::stats::UsageStats;
 use crate::wsl_bridge::WslBridge;
@@ -53,7 +54,12 @@ impl BridgeManager {
             .or_insert_with(|| WslBridge::new_with_conversation_id(conversation_id.to_string()));
 
         // Start the Claude process
-        bridge.start(app, options)?;
+        bridge.start(app.clone(), options)?;
+
+        // Record session start for cost tracking
+        tauri::async_runtime::spawn(async move {
+            record_session(&app).await;
+        });
 
         Ok(())
     }

src-tauri/src/clipboard.rs

@@ -257,3 +257,468 @@ pub fn update_clipboard_language(
     save_history(&app, &history)?;
     Ok(updated_entry)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // ==================== ClipboardEntry tests ====================
+
+    #[test]
+    fn test_clipboard_entry_new() {
+        let entry = ClipboardEntry::new(
+            "let x = 42;".to_string(),
+            Some("rust".to_string()),
+            Some("main.rs".to_string()),
+        );
+
+        assert_eq!(entry.content, "let x = 42;");
+        assert_eq!(entry.language, Some("rust".to_string()));
+        assert_eq!(entry.source, Some("main.rs".to_string()));
+        assert!(!entry.is_pinned);
+        assert!(!entry.id.is_empty());
+        assert!(!entry.timestamp.is_empty());
+    }
+
+    #[test]
+    fn test_clipboard_entry_new_without_optional_fields() {
+        let entry = ClipboardEntry::new("some content".to_string(), None, None);
+
+        assert_eq!(entry.content, "some content");
+        assert!(entry.language.is_none());
+        assert!(entry.source.is_none());
+        assert!(!entry.is_pinned);
+    }
+
+    #[test]
+    fn test_clipboard_entry_unique_ids() {
+        let entry1 = ClipboardEntry::new("content1".to_string(), None, None);
+        let entry2 = ClipboardEntry::new("content2".to_string(), None, None);
+
+        assert_ne!(entry1.id, entry2.id);
+    }
+
+    #[test]
+    fn test_clipboard_entry_serialization() {
+        let entry = ClipboardEntry::new(
+            "fn main() {}".to_string(),
+            Some("rust".to_string()),
+            Some("lib.rs".to_string()),
+        );
+
+        let json = serde_json::to_string(&entry).unwrap();
+        assert!(json.contains("fn main() {}"));
+        assert!(json.contains("rust"));
+        assert!(json.contains("lib.rs"));
+        assert!(json.contains("is_pinned"));
+
+        let deserialized: ClipboardEntry = serde_json::from_str(&json).unwrap();
+        assert_eq!(deserialized.content, entry.content);
+        assert_eq!(deserialized.language, entry.language);
+        assert_eq!(deserialized.source, entry.source);
+        assert_eq!(deserialized.id, entry.id);
+    }
+
+    #[test]
+    fn test_clipboard_entry_clone() {
+        let entry = ClipboardEntry::new(
+            "original".to_string(),
+            Some("python".to_string()),
+            None,
+        );
+
+        let cloned = entry.clone();
+        assert_eq!(cloned.content, entry.content);
+        assert_eq!(cloned.id, entry.id);
+        assert_eq!(cloned.language, entry.language);
+    }
+
+    #[test]
+    fn test_clipboard_entry_timestamp_is_rfc3339() {
+        let entry = ClipboardEntry::new("test".to_string(), None, None);
+
+        // RFC3339 timestamp should parse successfully
+        let parsed = chrono::DateTime::parse_from_rfc3339(&entry.timestamp);
+        assert!(parsed.is_ok());
+    }
+
+    // ==================== ClipboardHistory tests ====================
+
+    #[test]
+    fn test_clipboard_history_default() {
+        let history = ClipboardHistory::default();
+        assert!(history.entries.is_empty());
+    }
+
+    #[test]
+    fn test_clipboard_history_serialization() {
+        let mut history = ClipboardHistory::default();
+        history.entries.push(ClipboardEntry::new(
+            "entry1".to_string(),
+            Some("js".to_string()),
+            None,
+        ));
+        history.entries.push(ClipboardEntry::new(
+            "entry2".to_string(),
+            None,
+            Some("file.txt".to_string()),
+        ));
+
+        let json = serde_json::to_string(&history).unwrap();
+        assert!(json.contains("entry1"));
+        assert!(json.contains("entry2"));
+        assert!(json.contains("js"));
+        assert!(json.contains("file.txt"));
+
+        let deserialized: ClipboardHistory = serde_json::from_str(&json).unwrap();
+        assert_eq!(deserialized.entries.len(), 2);
+    }
+
+    #[test]
+    fn test_clipboard_history_entries_order() {
+        let mut history = ClipboardHistory::default();
+
+        history.entries.push(ClipboardEntry::new("first".to_string(), None, None));
+        history.entries.push(ClipboardEntry::new("second".to_string(), None, None));
+        history.entries.push(ClipboardEntry::new("third".to_string(), None, None));
+
+        assert_eq!(history.entries[0].content, "first");
+        assert_eq!(history.entries[1].content, "second");
+        assert_eq!(history.entries[2].content, "third");
+    }
+
+    // ==================== ClipboardState tests ====================
+
+    #[test]
+    fn test_clipboard_state_default() {
+        let state = ClipboardState::default();
+        assert!(state.last_content.is_none());
+    }
+
+    #[test]
+    fn test_clipboard_state_with_content() {
+        let state = ClipboardState {
+            last_content: Some("cached content".to_string()),
+        };
+        assert_eq!(state.last_content, Some("cached content".to_string()));
+    }
+
+    // ==================== MAX_HISTORY_SIZE constant test ====================
+
+    #[test]
+    fn test_max_history_size_is_reasonable() {
+        assert_eq!(MAX_HISTORY_SIZE, 100);
+        // Compile-time assertions for constant bounds
+        const _: () = assert!(MAX_HISTORY_SIZE > 0);
+        const _: () = assert!(MAX_HISTORY_SIZE <= 1000); // Sanity check
+    }
+
+    // ==================== Pinned entry sorting tests ====================
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_pinned_entries_sorting() {
+        let mut entries = vec![
+            ClipboardEntry {
+                id: "1".to_string(),
+                content: "unpinned older".to_string(),
+                language: None,
+                source: None,
+                timestamp: "2024-01-01T00:00:00Z".to_string(),
+                is_pinned: false,
+            },
+            ClipboardEntry {
+                id: "2".to_string(),
+                content: "pinned".to_string(),
+                language: None,
+                source: None,
+                timestamp: "2024-01-02T00:00:00Z".to_string(),
+                is_pinned: true,
+            },
+            ClipboardEntry {
+                id: "3".to_string(),
+                content: "unpinned newer".to_string(),
+                language: None,
+                source: None,
+                timestamp: "2024-01-03T00:00:00Z".to_string(),
+                is_pinned: false,
+            },
+        ];
+
+        // Apply the same sorting logic as used in the module
+        entries.sort_by(|a, b| {
+            if a.is_pinned && !b.is_pinned {
+                std::cmp::Ordering::Less
+            } else if !a.is_pinned && b.is_pinned {
+                std::cmp::Ordering::Greater
+            } else {
+                b.timestamp.cmp(&a.timestamp)
+            }
+        });
+
+        // Pinned should be first
+        assert!(entries[0].is_pinned);
+        assert_eq!(entries[0].id, "2");
+
+        // Then unpinned sorted by timestamp descending (newest first)
+        assert_eq!(entries[1].id, "3"); // newer unpinned
+        assert_eq!(entries[2].id, "1"); // older unpinned
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_multiple_pinned_entries_sorting() {
+        let mut entries = vec![
+            ClipboardEntry {
+                id: "1".to_string(),
+                content: "pinned older".to_string(),
+                language: None,
+                source: None,
+                timestamp: "2024-01-01T00:00:00Z".to_string(),
+                is_pinned: true,
+            },
+            ClipboardEntry {
+                id: "2".to_string(),
+                content: "unpinned".to_string(),
+                language: None,
+                source: None,
+                timestamp: "2024-01-02T00:00:00Z".to_string(),
+                is_pinned: false,
+            },
+            ClipboardEntry {
+                id: "3".to_string(),
+                content: "pinned newer".to_string(),
+                language: None,
+                source: None,
+                timestamp: "2024-01-03T00:00:00Z".to_string(),
+                is_pinned: true,
+            },
+        ];
+
+        entries.sort_by(|a, b| {
+            if a.is_pinned && !b.is_pinned {
+                std::cmp::Ordering::Less
+            } else if !a.is_pinned && b.is_pinned {
+                std::cmp::Ordering::Greater
+            } else {
+                b.timestamp.cmp(&a.timestamp)
+            }
+        });
+
+        // Both pinned first, sorted by timestamp
+        assert!(entries[0].is_pinned);
+        assert_eq!(entries[0].id, "3"); // pinned newer
+        assert!(entries[1].is_pinned);
+        assert_eq!(entries[1].id, "1"); // pinned older
+        // Then unpinned
+        assert!(!entries[2].is_pinned);
+        assert_eq!(entries[2].id, "2");
+    }
+
+    // ==================== Entry filtering tests ====================
+
+    #[test]
+    fn test_filter_entries_by_language() {
+        let history = ClipboardHistory {
+            entries: vec![
+                ClipboardEntry {
+                    id: "1".to_string(),
+                    content: "rust code".to_string(),
+                    language: Some("rust".to_string()),
+                    source: None,
+                    timestamp: "2024-01-01T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "2".to_string(),
+                    content: "js code".to_string(),
+                    language: Some("javascript".to_string()),
+                    source: None,
+                    timestamp: "2024-01-02T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "3".to_string(),
+                    content: "more rust".to_string(),
+                    language: Some("rust".to_string()),
+                    source: None,
+                    timestamp: "2024-01-03T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+            ],
+        };
+
+        let filtered: Vec<_> = history
+            .entries
+            .iter()
+            .filter(|e| e.language.as_ref() == Some(&"rust".to_string()))
+            .collect();
+
+        assert_eq!(filtered.len(), 2);
+        assert!(filtered.iter().all(|e| e.language == Some("rust".to_string())));
+    }
+
+    #[test]
+    fn test_search_entries_by_content() {
+        let history = ClipboardHistory {
+            entries: vec![
+                ClipboardEntry {
+                    id: "1".to_string(),
+                    content: "fn hello_world()".to_string(),
+                    language: Some("rust".to_string()),
+                    source: None,
+                    timestamp: "2024-01-01T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "2".to_string(),
+                    content: "function hello()".to_string(),
+                    language: Some("javascript".to_string()),
+                    source: None,
+                    timestamp: "2024-01-02T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "3".to_string(),
+                    content: "def goodbye()".to_string(),
+                    language: Some("python".to_string()),
+                    source: None,
+                    timestamp: "2024-01-03T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+            ],
+        };
+
+        let query = "hello";
+        let query_lower = query.to_lowercase();
+        let filtered: Vec<_> = history
+            .entries
+            .iter()
+            .filter(|e| e.content.to_lowercase().contains(&query_lower))
+            .collect();
+
+        assert_eq!(filtered.len(), 2);
+        assert!(filtered[0].content.contains("hello"));
+        assert!(filtered[1].content.contains("hello"));
+    }
+
+    #[test]
+    fn test_search_entries_case_insensitive() {
+        let history = ClipboardHistory {
+            entries: vec![
+                ClipboardEntry {
+                    id: "1".to_string(),
+                    content: "HELLO WORLD".to_string(),
+                    language: None,
+                    source: None,
+                    timestamp: "2024-01-01T00:00:00Z".to_string(),
+                    is_pinned: false,
+                },
+            ],
+        };
+
+        let query = "hello";
+        let query_lower = query.to_lowercase();
+        let filtered: Vec<_> = history
+            .entries
+            .iter()
+            .filter(|e| e.content.to_lowercase().contains(&query_lower))
+            .collect();
+
+        assert_eq!(filtered.len(), 1);
+    }
+
+    // ==================== Unique languages extraction test ====================
+
+    #[test]
+    fn test_extract_unique_languages() {
+        let history = ClipboardHistory {
+            entries: vec![
+                ClipboardEntry {
+                    id: "1".to_string(),
+                    content: "".to_string(),
+                    language: Some("rust".to_string()),
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "2".to_string(),
+                    content: "".to_string(),
+                    language: Some("javascript".to_string()),
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "3".to_string(),
+                    content: "".to_string(),
+                    language: Some("rust".to_string()), // Duplicate
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "4".to_string(),
+                    content: "".to_string(),
+                    language: None, // No language
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: false,
+                },
+            ],
+        };
+
+        let mut languages: Vec<String> = history
+            .entries
+            .iter()
+            .filter_map(|e| e.language.clone())
+            .collect();
+        languages.sort();
+        languages.dedup();
+
+        assert_eq!(languages.len(), 2);
+        assert!(languages.contains(&"rust".to_string()));
+        assert!(languages.contains(&"javascript".to_string()));
+    }
+
+    // ==================== Retain pinned entries test ====================
+
+    #[test]
+    fn test_retain_pinned_on_clear() {
+        let mut history = ClipboardHistory {
+            entries: vec![
+                ClipboardEntry {
+                    id: "1".to_string(),
+                    content: "pinned".to_string(),
+                    language: None,
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: true,
+                },
+                ClipboardEntry {
+                    id: "2".to_string(),
+                    content: "unpinned".to_string(),
+                    language: None,
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: false,
+                },
+                ClipboardEntry {
+                    id: "3".to_string(),
+                    content: "another pinned".to_string(),
+                    language: None,
+                    source: None,
+                    timestamp: "".to_string(),
+                    is_pinned: true,
+                },
+            ],
+        };
+
+        // Simulate clear (keep only pinned)
+        history.entries.retain(|e| e.is_pinned);
+
+        assert_eq!(history.entries.len(), 2);
+        assert!(history.entries.iter().all(|e| e.is_pinned));
+    }
+}

src-tauri/src/commands.rs

@@ -393,3 +393,516 @@ pub async fn get_file_size(file_path: String) -> Result<u64, String> {
         .map_err(|e| format!("Failed to get file metadata: {}", e))?;
     Ok(metadata.len())
 }
+
+// ==================== Editor File Operations ====================
+
+#[derive(Debug, Clone, serde::Serialize)]
+pub struct FileEntry {
+    pub name: String,
+    pub path: String,
+    #[serde(rename = "isDirectory")]
+    pub is_directory: bool,
+}
+
+#[tauri::command]
+pub async fn list_directory(path: String) -> Result<Vec<FileEntry>, String> {
+    use std::fs;
+    use std::path::Path;
+
+    let dir_path = Path::new(&path);
+
+    if !dir_path.exists() {
+        return Err(format!("Directory does not exist: {}", path));
+    }
+
+    if !dir_path.is_dir() {
+        return Err(format!("Path is not a directory: {}", path));
+    }
+
+    let entries = fs::read_dir(dir_path)
+        .map_err(|e| format!("Failed to read directory: {}", e))?;
+
+    let mut file_entries = Vec::new();
+
+    for entry in entries {
+        let entry = entry.map_err(|e| format!("Failed to read entry: {}", e))?;
+        let path = entry.path();
+        let name = entry
+            .file_name()
+            .to_string_lossy()
+            .to_string();
+
+        // Skip hidden files by default (can be made configurable later)
+        if name.starts_with('.') {
+            continue;
+        }
+
+        file_entries.push(FileEntry {
+            name,
+            path: path.to_string_lossy().to_string(),
+            is_directory: path.is_dir(),
+        });
+    }
+
+    Ok(file_entries)
+}
+
+#[tauri::command]
+pub async fn read_file_content(path: String) -> Result<String, String> {
+    use std::fs;
+
+    fs::read_to_string(&path)
+        .map_err(|e| format!("Failed to read file: {}", e))
+}
+
+#[tauri::command]
+pub async fn write_file_content(path: String, content: String) -> Result<(), String> {
+    use std::fs;
+
+    fs::write(&path, content)
+        .map_err(|e| format!("Failed to write file: {}", e))
+}
+
+#[tauri::command]
+pub async fn create_file(path: String) -> Result<(), String> {
+    use std::fs::File;
+    use std::path::Path;
+
+    let file_path = Path::new(&path);
+
+    if file_path.exists() {
+        return Err("File already exists".to_string());
+    }
+
+    File::create(file_path).map_err(|e| format!("Failed to create file: {}", e))?;
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn create_directory(path: String) -> Result<(), String> {
+    use std::fs;
+    use std::path::Path;
+
+    let dir_path = Path::new(&path);
+
+    if dir_path.exists() {
+        return Err("Directory already exists".to_string());
+    }
+
+    fs::create_dir_all(dir_path).map_err(|e| format!("Failed to create directory: {}", e))?;
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn delete_file(path: String) -> Result<(), String> {
+    use std::fs;
+    use std::path::Path;
+
+    let file_path = Path::new(&path);
+
+    if !file_path.exists() {
+        return Err("File does not exist".to_string());
+    }
+
+    if file_path.is_dir() {
+        return Err("Path is a directory, use delete_directory instead".to_string());
+    }
+
+    fs::remove_file(file_path).map_err(|e| format!("Failed to delete file: {}", e))?;
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn delete_directory(path: String) -> Result<(), String> {
+    use std::fs;
+    use std::path::Path;
+
+    let dir_path = Path::new(&path);
+
+    if !dir_path.exists() {
+        return Err("Directory does not exist".to_string());
+    }
+
+    if !dir_path.is_dir() {
+        return Err("Path is not a directory".to_string());
+    }
+
+    fs::remove_dir_all(dir_path).map_err(|e| format!("Failed to delete directory: {}", e))?;
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn rename_path(old_path: String, new_path: String) -> Result<(), String> {
+    use std::fs;
+    use std::path::Path;
+
+    let old = Path::new(&old_path);
+    let new = Path::new(&new_path);
+
+    if !old.exists() {
+        return Err("Path does not exist".to_string());
+    }
+
+    if new.exists() {
+        return Err("Destination already exists".to_string());
+    }
+
+    fs::rename(old, new).map_err(|e| format!("Failed to rename: {}", e))?;
+
+    Ok(())
+}
+
+// ==================== Cost Tracking Commands ====================
+
+const COST_HISTORY_STORE_KEY: &str = "cost_history";
+
+#[tauri::command]
+pub async fn get_cost_summary(app: AppHandle, days: u32) -> Result<crate::cost_tracking::CostSummary, String> {
+    let history = load_cost_history(&app).await;
+    Ok(history.get_summary(days))
+}
+
+#[tauri::command]
+pub async fn get_cost_alerts(app: AppHandle) -> Result<Vec<crate::cost_tracking::CostAlert>, String> {
+    let mut history = load_cost_history(&app).await;
+    let alerts = history.check_alerts();
+
+    // Save updated alert state
+    save_cost_history(&app, &history).await?;
+
+    Ok(alerts)
+}
+
+#[tauri::command]
+pub async fn set_cost_alert_thresholds(
+    app: AppHandle,
+    daily: Option<f64>,
+    weekly: Option<f64>,
+    monthly: Option<f64>,
+) -> Result<(), String> {
+    let mut history = load_cost_history(&app).await;
+    history.set_alert_thresholds(daily, weekly, monthly);
+    save_cost_history(&app, &history).await
+}
+
+#[tauri::command]
+pub async fn export_cost_csv(app: AppHandle, days: u32) -> Result<String, String> {
+    let history = load_cost_history(&app).await;
+    Ok(history.export_csv(days))
+}
+
+#[tauri::command]
+pub async fn get_today_cost(app: AppHandle) -> Result<f64, String> {
+    let history = load_cost_history(&app).await;
+    Ok(history.get_today_cost())
+}
+
+#[tauri::command]
+pub async fn get_week_cost(app: AppHandle) -> Result<f64, String> {
+    let history = load_cost_history(&app).await;
+    Ok(history.get_week_cost())
+}
+
+#[tauri::command]
+pub async fn get_month_cost(app: AppHandle) -> Result<f64, String> {
+    let history = load_cost_history(&app).await;
+    Ok(history.get_month_cost())
+}
+
+/// Add cost to history (called internally when stats are updated)
+pub async fn record_cost(app: &AppHandle, input_tokens: u64, output_tokens: u64, cost_usd: f64) {
+    let mut history = load_cost_history(app).await;
+    history.add_cost(input_tokens, output_tokens, cost_usd);
+    let _ = save_cost_history(app, &history).await;
+}
+
+/// Record a new session
+pub async fn record_session(app: &AppHandle) {
+    let mut history = load_cost_history(app).await;
+    history.increment_sessions();
+    let _ = save_cost_history(app, &history).await;
+}
+
+async fn load_cost_history(app: &AppHandle) -> crate::cost_tracking::CostHistory {
+    let store = match app.store("hikari-cost-history.json") {
+        Ok(s) => s,
+        Err(_) => return crate::cost_tracking::CostHistory::new(),
+    };
+
+    match store.get(COST_HISTORY_STORE_KEY) {
+        Some(value) => serde_json::from_value(value.clone()).unwrap_or_default(),
+        None => crate::cost_tracking::CostHistory::new(),
+    }
+}
+
+async fn save_cost_history(app: &AppHandle, history: &crate::cost_tracking::CostHistory) -> Result<(), String> {
+    let store = app.store("hikari-cost-history.json").map_err(|e| e.to_string())?;
+    let value = serde_json::to_value(history).map_err(|e| e.to_string())?;
+    store.set(COST_HISTORY_STORE_KEY, value);
+    store.save().map_err(|e| e.to_string())?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::{self, File};
+    use std::io::Write;
+    use tempfile::TempDir;
+
+    // Helper to run async tests
+    fn run_async<F: std::future::Future>(f: F) -> F::Output {
+        tokio::runtime::Runtime::new().unwrap().block_on(f)
+    }
+
+    // ==================== validate_directory tests ====================
+
+    #[test]
+    fn test_validate_directory_absolute_path_exists() {
+        let temp_dir = TempDir::new().unwrap();
+        let path = temp_dir.path().to_string_lossy().to_string();
+
+        let result = run_async(validate_directory(path.clone(), None));
+        assert!(result.is_ok());
+        // Canonicalized path should be returned
+        assert!(result.unwrap().contains(&temp_dir.path().file_name().unwrap().to_string_lossy().to_string()));
+    }
+
+    #[test]
+    fn test_validate_directory_path_not_exists() {
+        let result = run_async(validate_directory(
+            "/nonexistent/path/that/does/not/exist".to_string(),
+            None,
+        ));
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("does not exist"));
+    }
+
+    #[test]
+    fn test_validate_directory_path_is_file() {
+        let temp_dir = TempDir::new().unwrap();
+        let file_path = temp_dir.path().join("test_file.txt");
+        File::create(&file_path).unwrap();
+
+        let result = run_async(validate_directory(
+            file_path.to_string_lossy().to_string(),
+            None,
+        ));
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("not a directory"));
+    }
+
+    #[test]
+    fn test_validate_directory_home_expansion() {
+        // This test assumes HOME is set (which it should be on most systems)
+        if std::env::var_os("HOME").is_some() {
+            let result = run_async(validate_directory("~".to_string(), None));
+            assert!(result.is_ok());
+            // Should not contain ~ after expansion
+            assert!(!result.unwrap().contains("~"));
+        }
+    }
+
+    #[test]
+    fn test_validate_directory_home_subpath_expansion() {
+        // This test assumes HOME is set and has some subdirectory
+        if let Some(home) = std::env::var_os("HOME") {
+            let home_path = std::path::Path::new(&home);
+            // Find any subdirectory in home
+            if let Ok(entries) = fs::read_dir(home_path) {
+                for entry in entries.flatten() {
+                    if entry.path().is_dir() {
+                        let subdir_name = entry.file_name().to_string_lossy().to_string();
+                        let tilde_path = format!("~/{}", subdir_name);
+                        let result = run_async(validate_directory(tilde_path, None));
+                        assert!(result.is_ok());
+                        assert!(!result.unwrap().contains("~"));
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    #[test]
+    fn test_validate_directory_relative_path_with_current_dir() {
+        let temp_dir = TempDir::new().unwrap();
+        let subdir = temp_dir.path().join("subdir");
+        fs::create_dir(&subdir).unwrap();
+
+        let result = run_async(validate_directory(
+            "subdir".to_string(),
+            Some(temp_dir.path().to_string_lossy().to_string()),
+        ));
+        assert!(result.is_ok());
+        assert!(result.unwrap().contains("subdir"));
+    }
+
+    #[test]
+    fn test_validate_directory_dot_path() {
+        let temp_dir = TempDir::new().unwrap();
+
+        let result = run_async(validate_directory(
+            ".".to_string(),
+            Some(temp_dir.path().to_string_lossy().to_string()),
+        ));
+        assert!(result.is_ok());
+    }
+
+    #[test]
+    fn test_validate_directory_dotdot_path() {
+        let temp_dir = TempDir::new().unwrap();
+        let subdir = temp_dir.path().join("subdir");
+        fs::create_dir(&subdir).unwrap();
+
+        let result = run_async(validate_directory(
+            "..".to_string(),
+            Some(subdir.to_string_lossy().to_string()),
+        ));
+        assert!(result.is_ok());
+        // Should resolve to parent
+        let resolved = result.unwrap();
+        assert!(resolved.contains(&temp_dir.path().file_name().unwrap().to_string_lossy().to_string()));
+    }
+
+    #[test]
+    fn test_validate_directory_relative_without_current_dir() {
+        // Relative path without current_dir - should fail since relative path likely won't exist
+        let result = run_async(validate_directory(
+            "some_random_nonexistent_relative_path".to_string(),
+            None,
+        ));
+        assert!(result.is_err());
+    }
+
+    // ==================== get_file_size tests ====================
+
+    #[test]
+    fn test_get_file_size_empty_file() {
+        let temp_dir = TempDir::new().unwrap();
+        let file_path = temp_dir.path().join("empty.txt");
+        File::create(&file_path).unwrap();
+
+        let result = run_async(get_file_size(file_path.to_string_lossy().to_string()));
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), 0);
+    }
+
+    #[test]
+    fn test_get_file_size_with_content() {
+        let temp_dir = TempDir::new().unwrap();
+        let file_path = temp_dir.path().join("content.txt");
+        let mut file = File::create(&file_path).unwrap();
+        file.write_all(b"Hello, Hikari!").unwrap();
+
+        let result = run_async(get_file_size(file_path.to_string_lossy().to_string()));
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), 14); // "Hello, Hikari!" is 14 bytes
+    }
+
+    #[test]
+    fn test_get_file_size_larger_file() {
+        let temp_dir = TempDir::new().unwrap();
+        let file_path = temp_dir.path().join("large.txt");
+        let mut file = File::create(&file_path).unwrap();
+        // Write 1000 bytes
+        let data = vec![b'x'; 1000];
+        file.write_all(&data).unwrap();
+
+        let result = run_async(get_file_size(file_path.to_string_lossy().to_string()));
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), 1000);
+    }
+
+    #[test]
+    fn test_get_file_size_nonexistent_file() {
+        let result = run_async(get_file_size(
+            "/nonexistent/path/file.txt".to_string(),
+        ));
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("Failed to get file metadata"));
+    }
+
+    #[test]
+    fn test_get_file_size_directory() {
+        let temp_dir = TempDir::new().unwrap();
+
+        // Getting "size" of a directory should work but return directory metadata
+        // This is actually valid - directories have metadata too
+        let result = run_async(get_file_size(temp_dir.path().to_string_lossy().to_string()));
+        assert!(result.is_ok());
+        // Directory size is platform-dependent, just check it returns something
+    }
+
+    // ==================== list_skills tests ====================
+
+    #[test]
+    fn test_list_skills_no_skills_dir() {
+        // This test is tricky because it depends on HOME being set
+        // and potentially affecting real user data, so we'll just
+        // verify the function doesn't panic
+        let result = run_async(list_skills());
+        // Should either return Ok with a list or Ok with empty vec
+        assert!(result.is_ok());
+    }
+
+    // ==================== select_wsl_directory tests ====================
+
+    #[test]
+    fn test_select_wsl_directory_returns_home() {
+        let result = run_async(select_wsl_directory());
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), "/home");
+    }
+
+    // ==================== UpdateInfo struct tests ====================
+
+    #[test]
+    fn test_update_info_serialization() {
+        let info = UpdateInfo {
+            current_version: "1.0.0".to_string(),
+            latest_version: "0.4.0".to_string(),
+            has_update: true,
+            release_url: "https://example.com/release".to_string(),
+            release_notes: Some("New features!".to_string()),
+        };
+
+        let json = serde_json::to_string(&info).unwrap();
+        assert!(json.contains("1.0.0"));
+        assert!(json.contains("0.4.0"));
+        assert!(json.contains("true"));
+        assert!(json.contains("New features!"));
+    }
+
+    #[test]
+    fn test_update_info_without_notes() {
+        let info = UpdateInfo {
+            current_version: "1.0.0".to_string(),
+            latest_version: "1.0.0".to_string(),
+            has_update: false,
+            release_url: "https://example.com/release".to_string(),
+            release_notes: None,
+        };
+
+        let json = serde_json::to_string(&info).unwrap();
+        assert!(json.contains("null") || json.contains("release_notes"));
+    }
+
+    // ==================== SavedFileInfo struct tests ====================
+
+    #[test]
+    fn test_saved_file_info_serialization() {
+        let info = SavedFileInfo {
+            path: "/tmp/test.txt".to_string(),
+            filename: "test.txt".to_string(),
+        };
+
+        let json = serde_json::to_string(&info).unwrap();
+        assert!(json.contains("/tmp/test.txt"));
+        assert!(json.contains("test.txt"));
+    }
+}

src-tauri/src/config.rs

@@ -96,6 +96,22 @@ pub struct HikariConfig {
     // Custom theme colors
     #[serde(default)]
     pub custom_theme_colors: CustomThemeColors,
+
+    // Token budget settings
+    #[serde(default)]
+    pub budget_enabled: bool,
+
+    #[serde(default)]
+    pub session_token_budget: Option<u64>,
+
+    #[serde(default)]
+    pub session_cost_budget: Option<f64>,
+
+    #[serde(default = "default_budget_action")]
+    pub budget_action: BudgetAction,
+
+    #[serde(default = "default_budget_warning_threshold")]
+    pub budget_warning_threshold: f32,
 }
 
 impl Default for HikariConfig {
@@ -123,6 +139,11 @@ impl Default for HikariConfig {
             profile_avatar_path: None,
             profile_bio: None,
             custom_theme_colors: CustomThemeColors::default(),
+            budget_enabled: false,
+            session_token_budget: None,
+            session_cost_budget: None,
+            budget_action: BudgetAction::Warn,
+            budget_warning_threshold: 0.8,
         }
     }
 }
@@ -147,6 +168,22 @@ fn default_font_size() -> u32 {
     14
 }
 
+fn default_budget_action() -> BudgetAction {
+    BudgetAction::Warn
+}
+
+fn default_budget_warning_threshold() -> f32 {
+    0.8
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq)]
+#[serde(rename_all = "lowercase")]
+pub enum BudgetAction {
+    #[default]
+    Warn,
+    Block,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize, Default, PartialEq)]
 #[serde(rename_all = "lowercase")]
 pub enum Theme {
@@ -205,6 +242,11 @@ mod tests {
         assert!(config.profile_avatar_path.is_none());
         assert!(config.profile_bio.is_none());
         assert_eq!(config.custom_theme_colors, CustomThemeColors::default());
+        assert!(!config.budget_enabled);
+        assert!(config.session_token_budget.is_none());
+        assert!(config.session_cost_budget.is_none());
+        assert_eq!(config.budget_action, BudgetAction::Warn);
+        assert!((config.budget_warning_threshold - 0.8).abs() < f32::EPSILON);
     }
 
     #[test]
@@ -232,6 +274,11 @@ mod tests {
             profile_avatar_path: None,
             profile_bio: Some("A test bio".to_string()),
             custom_theme_colors: CustomThemeColors::default(),
+            budget_enabled: true,
+            session_token_budget: Some(100000),
+            session_cost_budget: Some(1.50),
+            budget_action: BudgetAction::Block,
+            budget_warning_threshold: 0.75,
         };
 
         let json = serde_json::to_string(&config).unwrap();

src-tauri/src/cost_tracking.rs

@@ -0,0 +1,376 @@
+use chrono::{Datelike, Local, NaiveDate, Weekday};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+/// Represents a single day's cost data
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct DailyCost {
+    pub date: String, // ISO date string (YYYY-MM-DD)
+    pub input_tokens: u64,
+    pub output_tokens: u64,
+    pub cost_usd: f64,
+    pub messages_sent: u64,
+    pub sessions_count: u64,
+}
+
+/// Historical cost tracking data
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct CostHistory {
+    /// Daily costs indexed by date string (YYYY-MM-DD)
+    pub daily_costs: HashMap<String, DailyCost>,
+    /// Cost alert thresholds
+    pub daily_alert_threshold: Option<f64>,
+    pub weekly_alert_threshold: Option<f64>,
+    pub monthly_alert_threshold: Option<f64>,
+    /// Whether alerts have been triggered today
+    pub daily_alert_triggered: bool,
+    pub weekly_alert_triggered: bool,
+    pub monthly_alert_triggered: bool,
+    pub last_alert_reset_date: Option<String>,
+}
+
+impl CostHistory {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Get today's date as a string
+    fn today_str() -> String {
+        Local::now().format("%Y-%m-%d").to_string()
+    }
+
+    /// Get the start of the current week (Monday)
+    fn week_start() -> NaiveDate {
+        let today = Local::now().date_naive();
+        let days_since_monday = today.weekday().num_days_from_monday();
+        today - chrono::Duration::days(days_since_monday as i64)
+    }
+
+    /// Get the start of the current month
+    fn month_start() -> NaiveDate {
+        let today = Local::now().date_naive();
+        NaiveDate::from_ymd_opt(today.year(), today.month(), 1).unwrap_or(today)
+    }
+
+    /// Add cost for today
+    pub fn add_cost(&mut self, input_tokens: u64, output_tokens: u64, cost_usd: f64) {
+        let today = Self::today_str();
+
+        // Reset alert flags if it's a new day
+        if self.last_alert_reset_date.as_ref() != Some(&today) {
+            self.daily_alert_triggered = false;
+            // Reset weekly on Monday
+            if Local::now().weekday() == Weekday::Mon {
+                self.weekly_alert_triggered = false;
+            }
+            // Reset monthly on the 1st
+            if Local::now().day() == 1 {
+                self.monthly_alert_triggered = false;
+            }
+            self.last_alert_reset_date = Some(today.clone());
+        }
+
+        let daily = self.daily_costs.entry(today).or_default();
+        daily.input_tokens += input_tokens;
+        daily.output_tokens += output_tokens;
+        daily.cost_usd += cost_usd;
+        daily.messages_sent += 1;
+    }
+
+    /// Increment session count for today
+    pub fn increment_sessions(&mut self) {
+        let today = Self::today_str();
+        let daily = self.daily_costs.entry(today.clone()).or_insert_with(|| DailyCost {
+            date: today,
+            ..Default::default()
+        });
+        daily.sessions_count += 1;
+    }
+
+    /// Get today's cost
+    pub fn get_today_cost(&self) -> f64 {
+        self.daily_costs
+            .get(&Self::today_str())
+            .map(|d| d.cost_usd)
+            .unwrap_or(0.0)
+    }
+
+    /// Get this week's cost (Monday to Sunday)
+    pub fn get_week_cost(&self) -> f64 {
+        let week_start = Self::week_start();
+        self.daily_costs
+            .values()
+            .filter(|d| {
+                NaiveDate::parse_from_str(&d.date, "%Y-%m-%d")
+                    .map(|date| date >= week_start)
+                    .unwrap_or(false)
+            })
+            .map(|d| d.cost_usd)
+            .sum()
+    }
+
+    /// Get this month's cost
+    pub fn get_month_cost(&self) -> f64 {
+        let month_start = Self::month_start();
+        self.daily_costs
+            .values()
+            .filter(|d| {
+                NaiveDate::parse_from_str(&d.date, "%Y-%m-%d")
+                    .map(|date| date >= month_start)
+                    .unwrap_or(false)
+            })
+            .map(|d| d.cost_usd)
+            .sum()
+    }
+
+    /// Get cost summary for a date range
+    pub fn get_summary(&self, days: u32) -> CostSummary {
+        let today = Local::now().date_naive();
+        let start_date = today - chrono::Duration::days(days as i64 - 1);
+
+        let mut total_input_tokens = 0u64;
+        let mut total_output_tokens = 0u64;
+        let mut total_cost = 0.0f64;
+        let mut total_messages = 0u64;
+        let mut total_sessions = 0u64;
+        let mut daily_breakdown = Vec::new();
+
+        for i in 0..days {
+            let date = start_date + chrono::Duration::days(i as i64);
+            let date_str = date.format("%Y-%m-%d").to_string();
+
+            if let Some(daily) = self.daily_costs.get(&date_str) {
+                total_input_tokens += daily.input_tokens;
+                total_output_tokens += daily.output_tokens;
+                total_cost += daily.cost_usd;
+                total_messages += daily.messages_sent;
+                total_sessions += daily.sessions_count;
+                daily_breakdown.push(daily.clone());
+            } else {
+                daily_breakdown.push(DailyCost {
+                    date: date_str,
+                    ..Default::default()
+                });
+            }
+        }
+
+        CostSummary {
+            period_days: days,
+            total_input_tokens,
+            total_output_tokens,
+            total_cost,
+            total_messages,
+            total_sessions,
+            average_daily_cost: if days > 0 { total_cost / days as f64 } else { 0.0 },
+            daily_breakdown,
+        }
+    }
+
+    /// Check if any alert thresholds are exceeded and return which ones
+    pub fn check_alerts(&mut self) -> Vec<CostAlert> {
+        let mut alerts = Vec::new();
+
+        if let Some(threshold) = self.daily_alert_threshold {
+            let today_cost = self.get_today_cost();
+            if today_cost >= threshold && !self.daily_alert_triggered {
+                self.daily_alert_triggered = true;
+                alerts.push(CostAlert {
+                    alert_type: AlertType::Daily,
+                    threshold,
+                    current_cost: today_cost,
+                });
+            }
+        }
+
+        if let Some(threshold) = self.weekly_alert_threshold {
+            let week_cost = self.get_week_cost();
+            if week_cost >= threshold && !self.weekly_alert_triggered {
+                self.weekly_alert_triggered = true;
+                alerts.push(CostAlert {
+                    alert_type: AlertType::Weekly,
+                    threshold,
+                    current_cost: week_cost,
+                });
+            }
+        }
+
+        if let Some(threshold) = self.monthly_alert_threshold {
+            let month_cost = self.get_month_cost();
+            if month_cost >= threshold && !self.monthly_alert_triggered {
+                self.monthly_alert_triggered = true;
+                alerts.push(CostAlert {
+                    alert_type: AlertType::Monthly,
+                    threshold,
+                    current_cost: month_cost,
+                });
+            }
+        }
+
+        alerts
+    }
+
+    /// Set alert thresholds
+    pub fn set_alert_thresholds(
+        &mut self,
+        daily: Option<f64>,
+        weekly: Option<f64>,
+        monthly: Option<f64>,
+    ) {
+        self.daily_alert_threshold = daily;
+        self.weekly_alert_threshold = weekly;
+        self.monthly_alert_threshold = monthly;
+    }
+
+    /// Clean up old data (keep last N days)
+    #[allow(dead_code)]
+    pub fn cleanup_old_data(&mut self, keep_days: u32) {
+        let cutoff = Local::now().date_naive() - chrono::Duration::days(keep_days as i64);
+        self.daily_costs.retain(|date_str, _| {
+            NaiveDate::parse_from_str(date_str, "%Y-%m-%d")
+                .map(|date| date >= cutoff)
+                .unwrap_or(false)
+        });
+    }
+
+    /// Export to CSV format
+    pub fn export_csv(&self, days: u32) -> String {
+        let summary = self.get_summary(days);
+        let mut csv = String::from("Date,Input Tokens,Output Tokens,Cost (USD),Messages,Sessions\n");
+
+        for daily in &summary.daily_breakdown {
+            csv.push_str(&format!(
+                "{},{},{},{:.4},{},{}\n",
+                daily.date,
+                daily.input_tokens,
+                daily.output_tokens,
+                daily.cost_usd,
+                daily.messages_sent,
+                daily.sessions_count
+            ));
+        }
+
+        // Add totals row
+        csv.push_str(&format!(
+            "TOTAL,{},{},{:.4},{},{}\n",
+            summary.total_input_tokens,
+            summary.total_output_tokens,
+            summary.total_cost,
+            summary.total_messages,
+            summary.total_sessions
+        ));
+
+        csv
+    }
+}
+
+/// Cost summary for a period
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CostSummary {
+    pub period_days: u32,
+    pub total_input_tokens: u64,
+    pub total_output_tokens: u64,
+    pub total_cost: f64,
+    pub total_messages: u64,
+    pub total_sessions: u64,
+    pub average_daily_cost: f64,
+    pub daily_breakdown: Vec<DailyCost>,
+}
+
+/// Alert types
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+pub enum AlertType {
+    Daily,
+    Weekly,
+    Monthly,
+}
+
+/// Cost alert notification
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CostAlert {
+    pub alert_type: AlertType,
+    pub threshold: f64,
+    pub current_cost: f64,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_add_cost() {
+        let mut history = CostHistory::new();
+        history.add_cost(1000, 500, 0.05);
+
+        let today_cost = history.get_today_cost();
+        assert!((today_cost - 0.05).abs() < 0.0001);
+    }
+
+    #[test]
+    fn test_accumulate_daily_cost() {
+        let mut history = CostHistory::new();
+        history.add_cost(1000, 500, 0.05);
+        history.add_cost(2000, 1000, 0.10);
+
+        let today_cost = history.get_today_cost();
+        assert!((today_cost - 0.15).abs() < 0.0001);
+    }
+
+    #[test]
+    fn test_summary() {
+        let mut history = CostHistory::new();
+        history.add_cost(1000, 500, 0.05);
+
+        let summary = history.get_summary(7);
+        assert_eq!(summary.period_days, 7);
+        assert!((summary.total_cost - 0.05).abs() < 0.0001);
+    }
+
+    #[test]
+    fn test_daily_alert() {
+        let mut history = CostHistory::new();
+        history.set_alert_thresholds(Some(0.10), None, None);
+
+        history.add_cost(1000, 500, 0.05);
+        let alerts = history.check_alerts();
+        assert!(alerts.is_empty());
+
+        history.add_cost(1000, 500, 0.06);
+        let alerts = history.check_alerts();
+        assert_eq!(alerts.len(), 1);
+        assert_eq!(alerts[0].alert_type, AlertType::Daily);
+    }
+
+    #[test]
+    fn test_alert_only_triggers_once() {
+        let mut history = CostHistory::new();
+        history.set_alert_thresholds(Some(0.10), None, None);
+
+        history.add_cost(1000, 500, 0.15);
+        let alerts = history.check_alerts();
+        assert_eq!(alerts.len(), 1);
+
+        // Second check should not trigger again
+        let alerts = history.check_alerts();
+        assert!(alerts.is_empty());
+    }
+
+    #[test]
+    fn test_export_csv() {
+        let mut history = CostHistory::new();
+        history.add_cost(1000, 500, 0.05);
+
+        let csv = history.export_csv(1);
+        assert!(csv.contains("Date,Input Tokens"));
+        assert!(csv.contains("TOTAL"));
+    }
+
+    #[test]
+    fn test_increment_sessions() {
+        let mut history = CostHistory::new();
+        history.increment_sessions();
+        history.increment_sessions();
+
+        let summary = history.get_summary(1);
+        assert_eq!(summary.total_sessions, 2);
+    }
+}

src-tauri/src/git.rs

@@ -286,3 +286,593 @@ pub fn git_discard(working_dir: String, file_path: String) -> Result<String, Str
 pub fn git_create_branch(working_dir: String, branch_name: String) -> Result<String, String> {
     run_git_command(&working_dir, &["checkout", "-b", &branch_name])
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::{self, File};
+    use std::io::Write;
+    use tempfile::TempDir;
+
+    // Helper to create a git repository in a temp directory
+    fn create_test_repo() -> TempDir {
+        let temp_dir = TempDir::new().unwrap();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Initialize git repo
+        run_git_command(&working_dir, &["init"]).unwrap();
+
+        // Configure git user for commits
+        run_git_command(&working_dir, &["config", "user.email", "test@example.com"]).unwrap();
+        run_git_command(&working_dir, &["config", "user.name", "Test User"]).unwrap();
+
+        // Disable GPG signing for tests (user may have it enabled globally)
+        run_git_command(&working_dir, &["config", "commit.gpgsign", "false"]).unwrap();
+
+        temp_dir
+    }
+
+    // Helper to create a file in the test repo
+    fn create_file(dir: &TempDir, name: &str, content: &str) {
+        let file_path = dir.path().join(name);
+        let mut file = File::create(file_path).unwrap();
+        file.write_all(content.as_bytes()).unwrap();
+    }
+
+    // ==================== GitStatus struct tests ====================
+
+    #[test]
+    fn test_git_status_serialization() {
+        let status = GitStatus {
+            is_repo: true,
+            branch: Some("main".to_string()),
+            upstream: Some("origin/main".to_string()),
+            ahead: 2,
+            behind: 1,
+            staged: vec![GitFileChange {
+                path: "file.txt".to_string(),
+                status: "modified".to_string(),
+            }],
+            unstaged: vec![],
+            untracked: vec!["new_file.txt".to_string()],
+        };
+
+        let json = serde_json::to_string(&status).unwrap();
+        assert!(json.contains("\"is_repo\":true"));
+        assert!(json.contains("\"branch\":\"main\""));
+        assert!(json.contains("\"ahead\":2"));
+        assert!(json.contains("\"behind\":1"));
+    }
+
+    #[test]
+    fn test_git_status_not_a_repo() {
+        let status = GitStatus {
+            is_repo: false,
+            branch: None,
+            upstream: None,
+            ahead: 0,
+            behind: 0,
+            staged: vec![],
+            unstaged: vec![],
+            untracked: vec![],
+        };
+
+        let json = serde_json::to_string(&status).unwrap();
+        let deserialized: GitStatus = serde_json::from_str(&json).unwrap();
+        assert!(!deserialized.is_repo);
+        assert!(deserialized.branch.is_none());
+    }
+
+    // ==================== GitFileChange struct tests ====================
+
+    #[test]
+    fn test_git_file_change_serialization() {
+        let change = GitFileChange {
+            path: "src/main.rs".to_string(),
+            status: "added".to_string(),
+        };
+
+        let json = serde_json::to_string(&change).unwrap();
+        assert!(json.contains("src/main.rs"));
+        assert!(json.contains("added"));
+
+        let deserialized: GitFileChange = serde_json::from_str(&json).unwrap();
+        assert_eq!(deserialized.path, "src/main.rs");
+        assert_eq!(deserialized.status, "added");
+    }
+
+    // ==================== GitBranch struct tests ====================
+
+    #[test]
+    fn test_git_branch_serialization() {
+        let branch = GitBranch {
+            name: "feature/new-feature".to_string(),
+            is_current: true,
+            is_remote: false,
+        };
+
+        let json = serde_json::to_string(&branch).unwrap();
+        assert!(json.contains("feature/new-feature"));
+        assert!(json.contains("\"is_current\":true"));
+        assert!(json.contains("\"is_remote\":false"));
+    }
+
+    #[test]
+    fn test_git_branch_remote() {
+        let branch = GitBranch {
+            name: "origin/main".to_string(),
+            is_current: false,
+            is_remote: true,
+        };
+
+        let json = serde_json::to_string(&branch).unwrap();
+        let deserialized: GitBranch = serde_json::from_str(&json).unwrap();
+        assert!(deserialized.is_remote);
+        assert!(!deserialized.is_current);
+    }
+
+    // ==================== GitLogEntry struct tests ====================
+
+    #[test]
+    fn test_git_log_entry_serialization() {
+        let entry = GitLogEntry {
+            hash: "abc123def456".to_string(),
+            short_hash: "abc123d".to_string(),
+            author: "Hikari".to_string(),
+            date: "2 hours ago".to_string(),
+            message: "feat: add new feature".to_string(),
+        };
+
+        let json = serde_json::to_string(&entry).unwrap();
+        assert!(json.contains("abc123def456"));
+        assert!(json.contains("Hikari"));
+        assert!(json.contains("feat: add new feature"));
+    }
+
+    // ==================== git_status integration tests ====================
+
+    #[test]
+    fn test_git_status_not_a_git_repo() {
+        let temp_dir = TempDir::new().unwrap();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        let result = git_status(working_dir);
+        assert!(result.is_ok());
+
+        let status = result.unwrap();
+        assert!(!status.is_repo);
+        assert!(status.branch.is_none());
+        assert!(status.staged.is_empty());
+    }
+
+    #[test]
+    fn test_git_status_empty_repo() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        let result = git_status(working_dir);
+        assert!(result.is_ok());
+
+        let status = result.unwrap();
+        assert!(status.is_repo);
+        assert!(status.staged.is_empty());
+        assert!(status.unstaged.is_empty());
+        assert!(status.untracked.is_empty());
+    }
+
+    #[test]
+    fn test_git_status_with_untracked_file() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create an untracked file
+        create_file(&temp_dir, "untracked.txt", "hello");
+
+        let result = git_status(working_dir);
+        assert!(result.is_ok());
+
+        let status = result.unwrap();
+        assert!(status.is_repo);
+        assert!(status.untracked.contains(&"untracked.txt".to_string()));
+    }
+
+    #[test]
+    fn test_git_status_with_staged_file() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create and stage a file
+        create_file(&temp_dir, "staged.txt", "hello");
+        run_git_command(&working_dir, &["add", "staged.txt"]).unwrap();
+
+        let result = git_status(working_dir);
+        assert!(result.is_ok());
+
+        let status = result.unwrap();
+        assert!(status.is_repo);
+        assert!(!status.staged.is_empty());
+        assert_eq!(status.staged[0].path, "staged.txt");
+        assert_eq!(status.staged[0].status, "added");
+    }
+
+    #[test]
+    fn test_git_status_with_modified_file() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create, stage, and commit a file
+        create_file(&temp_dir, "file.txt", "initial content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial commit"]).unwrap();
+
+        // Modify the file
+        create_file(&temp_dir, "file.txt", "modified content");
+
+        let result = git_status(working_dir);
+        assert!(result.is_ok());
+
+        let status = result.unwrap();
+        assert!(status.is_repo);
+        assert!(!status.unstaged.is_empty());
+        assert_eq!(status.unstaged[0].path, "file.txt");
+        assert_eq!(status.unstaged[0].status, "modified");
+    }
+
+    // ==================== git_diff integration tests ====================
+
+    #[test]
+    fn test_git_diff_no_changes() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        let result = git_diff(working_dir, None, false);
+        assert!(result.is_ok());
+        assert!(result.unwrap().is_empty());
+    }
+
+    #[test]
+    fn test_git_diff_with_changes() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create and commit a file
+        create_file(&temp_dir, "file.txt", "initial content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Modify the file
+        create_file(&temp_dir, "file.txt", "modified content");
+
+        let result = git_diff(working_dir, None, false);
+        assert!(result.is_ok());
+        let diff = result.unwrap();
+        assert!(diff.contains("diff"));
+        assert!(diff.contains("file.txt"));
+    }
+
+    #[test]
+    fn test_git_diff_staged() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create and commit a file
+        create_file(&temp_dir, "file.txt", "initial content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Modify and stage the file
+        create_file(&temp_dir, "file.txt", "modified content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+
+        let result = git_diff(working_dir, None, true);
+        assert!(result.is_ok());
+        let diff = result.unwrap();
+        assert!(diff.contains("diff"));
+    }
+
+    #[test]
+    fn test_git_diff_specific_file() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create and commit files
+        create_file(&temp_dir, "file1.txt", "content1");
+        create_file(&temp_dir, "file2.txt", "content2");
+        run_git_command(&working_dir, &["add", "-A"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Modify both files
+        create_file(&temp_dir, "file1.txt", "modified1");
+        create_file(&temp_dir, "file2.txt", "modified2");
+
+        // Get diff for only file1.txt
+        let result = git_diff(working_dir, Some("file1.txt".to_string()), false);
+        assert!(result.is_ok());
+        let diff = result.unwrap();
+        assert!(diff.contains("file1.txt"));
+        assert!(!diff.contains("file2.txt"));
+    }
+
+    // ==================== git_branches integration tests ====================
+
+    #[test]
+    fn test_git_branches_single_branch() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Need at least one commit for branches to show
+        create_file(&temp_dir, "file.txt", "content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        let result = git_branches(working_dir);
+        assert!(result.is_ok());
+
+        let branches = result.unwrap();
+        assert!(!branches.is_empty());
+        // Should have at least one branch (main or master)
+    }
+
+    #[test]
+    fn test_git_branches_multiple_branches() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Initial commit
+        create_file(&temp_dir, "file.txt", "content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Create additional branch
+        run_git_command(&working_dir, &["branch", "feature-branch"]).unwrap();
+
+        let result = git_branches(working_dir);
+        assert!(result.is_ok());
+
+        let branches = result.unwrap();
+        assert!(branches.len() >= 2);
+        assert!(branches.iter().any(|b| b.name == "feature-branch"));
+    }
+
+    // ==================== git_stage and git_unstage tests ====================
+
+    #[test]
+    fn test_git_stage_file() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        create_file(&temp_dir, "file.txt", "content");
+
+        let result = git_stage(working_dir.clone(), "file.txt".to_string());
+        assert!(result.is_ok());
+
+        // Verify file is staged
+        let status = git_status(working_dir).unwrap();
+        assert!(status.staged.iter().any(|f| f.path == "file.txt"));
+    }
+
+    #[test]
+    fn test_git_unstage_file() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // First, commit a file so we have a HEAD to restore from
+        create_file(&temp_dir, "file.txt", "initial content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Modify and stage the file
+        create_file(&temp_dir, "file.txt", "modified content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+
+        let result = git_unstage(working_dir.clone(), "file.txt".to_string());
+        assert!(result.is_ok());
+
+        // Verify file is unstaged (should now be in unstaged/modified, not staged)
+        let status = git_status(working_dir).unwrap();
+        assert!(!status.staged.iter().any(|f| f.path == "file.txt"));
+        assert!(status.unstaged.iter().any(|f| f.path == "file.txt"));
+    }
+
+    #[test]
+    fn test_git_stage_all() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        create_file(&temp_dir, "file1.txt", "content1");
+        create_file(&temp_dir, "file2.txt", "content2");
+
+        let result = git_stage_all(working_dir.clone());
+        assert!(result.is_ok());
+
+        // Verify all files are staged
+        let status = git_status(working_dir).unwrap();
+        assert_eq!(status.staged.len(), 2);
+    }
+
+    // ==================== git_commit tests ====================
+
+    #[test]
+    fn test_git_commit() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        create_file(&temp_dir, "file.txt", "content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+
+        let result = git_commit(working_dir.clone(), "test commit message".to_string());
+        assert!(result.is_ok());
+
+        // Verify commit was made
+        let log = git_log(working_dir, Some(1)).unwrap();
+        assert!(!log.is_empty());
+        assert!(log[0].message.contains("test commit message"));
+    }
+
+    #[test]
+    fn test_git_commit_nothing_to_commit() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Need initial commit first
+        create_file(&temp_dir, "file.txt", "content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Try to commit with nothing staged
+        let result = git_commit(working_dir, "empty commit".to_string());
+        assert!(result.is_err()); // Should fail because nothing to commit
+    }
+
+    // ==================== git_log tests ====================
+
+    #[test]
+    fn test_git_log_empty_repo() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        let result = git_log(working_dir, Some(10));
+        // May fail on empty repo or return empty
+        if let Ok(commits) = result {
+            assert!(commits.is_empty());
+        }
+    }
+
+    #[test]
+    fn test_git_log_with_commits() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Make multiple commits
+        for i in 1..=3 {
+            create_file(&temp_dir, &format!("file{}.txt", i), "content");
+            run_git_command(&working_dir, &["add", "-A"]).unwrap();
+            run_git_command(&working_dir, &["commit", "-m", &format!("commit {}", i)]).unwrap();
+        }
+
+        let result = git_log(working_dir, Some(10));
+        assert!(result.is_ok());
+
+        let log = result.unwrap();
+        assert_eq!(log.len(), 3);
+        assert!(log[0].message.contains("commit 3")); // Most recent first
+        assert!(log[2].message.contains("commit 1"));
+    }
+
+    #[test]
+    fn test_git_log_limit() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Make 5 commits
+        for i in 1..=5 {
+            create_file(&temp_dir, &format!("file{}.txt", i), "content");
+            run_git_command(&working_dir, &["add", "-A"]).unwrap();
+            run_git_command(&working_dir, &["commit", "-m", &format!("commit {}", i)]).unwrap();
+        }
+
+        // Only get last 2
+        let result = git_log(working_dir, Some(2));
+        assert!(result.is_ok());
+
+        let log = result.unwrap();
+        assert_eq!(log.len(), 2);
+    }
+
+    // ==================== git_discard tests ====================
+
+    #[test]
+    fn test_git_discard_changes() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Create and commit a file
+        create_file(&temp_dir, "file.txt", "original content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Modify the file
+        create_file(&temp_dir, "file.txt", "modified content");
+
+        // Discard changes
+        let result = git_discard(working_dir.clone(), "file.txt".to_string());
+        assert!(result.is_ok());
+
+        // Verify file contents are restored
+        let content = fs::read_to_string(temp_dir.path().join("file.txt")).unwrap();
+        assert_eq!(content, "original content");
+    }
+
+    // ==================== git_create_branch tests ====================
+
+    #[test]
+    fn test_git_create_branch() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Initial commit required
+        create_file(&temp_dir, "file.txt", "content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        let result = git_create_branch(working_dir.clone(), "new-branch".to_string());
+        assert!(result.is_ok());
+
+        // Verify branch exists and is current
+        let branches = git_branches(working_dir).unwrap();
+        assert!(branches.iter().any(|b| b.name == "new-branch" && b.is_current));
+    }
+
+    // ==================== git_checkout tests ====================
+
+    #[test]
+    fn test_git_checkout() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // Initial commit required
+        create_file(&temp_dir, "file.txt", "content");
+        run_git_command(&working_dir, &["add", "file.txt"]).unwrap();
+        run_git_command(&working_dir, &["commit", "-m", "initial"]).unwrap();
+
+        // Create a branch
+        run_git_command(&working_dir, &["branch", "other-branch"]).unwrap();
+
+        // Checkout the branch
+        let result = git_checkout(working_dir.clone(), "other-branch".to_string());
+        assert!(result.is_ok());
+
+        // Verify current branch
+        let branches = git_branches(working_dir).unwrap();
+        let current = branches.iter().find(|b| b.is_current);
+        assert!(current.is_some());
+        assert_eq!(current.unwrap().name, "other-branch");
+    }
+
+    // ==================== run_git_command tests ====================
+
+    #[test]
+    fn test_run_git_command_success() {
+        let temp_dir = create_test_repo();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        let result = run_git_command(&working_dir, &["status"]);
+        assert!(result.is_ok());
+    }
+
+    #[test]
+    fn test_run_git_command_failure() {
+        let temp_dir = TempDir::new().unwrap();
+        let working_dir = temp_dir.path().to_string_lossy().to_string();
+
+        // This should fail because it's not a git repo
+        let result = run_git_command(&working_dir, &["log"]);
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn test_run_git_command_invalid_dir() {
+        let result = run_git_command("/nonexistent/path", &["status"]);
+        assert!(result.is_err());
+    }
+}

src-tauri/src/lib.rs

@@ -3,6 +3,7 @@ mod bridge_manager;
 mod clipboard;
 mod commands;
 mod config;
+mod cost_tracking;
 mod git;
 mod notifications;
 mod quick_actions;
@@ -10,6 +11,7 @@ mod sessions;
 mod snippets;
 mod stats;
 mod temp_manager;
+mod tool_cache;
 mod tray;
 mod types;
 mod vbs_notification;
@@ -151,6 +153,22 @@ pub fn run() {
             search_clipboard_entries,
             get_clipboard_languages,
             update_clipboard_language,
+            list_directory,
+            read_file_content,
+            write_file_content,
+            create_file,
+            create_directory,
+            delete_file,
+            delete_directory,
+            rename_path,
+            // Cost tracking commands
+            get_cost_summary,
+            get_cost_alerts,
+            set_cost_alert_thresholds,
+            export_cost_csv,
+            get_today_cost,
+            get_week_cost,
+            get_month_cost,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");

src-tauri/src/quick_actions.rs

@@ -171,6 +171,18 @@ pub async fn reset_default_quick_actions(app: AppHandle) -> Result<(), String> {
 mod tests {
     use super::*;
 
+    fn create_test_action(id: &str, name: &str, is_default: bool) -> QuickAction {
+        QuickAction {
+            id: id.to_string(),
+            name: name.to_string(),
+            prompt: "Test prompt".to_string(),
+            icon: "star".to_string(),
+            is_default,
+            created_at: Utc::now(),
+            updated_at: Utc::now(),
+        }
+    }
+
     #[test]
     fn test_default_quick_actions_exist() {
         let defaults = get_default_quick_actions();
@@ -188,4 +200,174 @@ mod tests {
             assert!(!action.icon.is_empty());
         }
     }
+
+    #[test]
+    fn test_default_quick_actions_count() {
+        let defaults = get_default_quick_actions();
+        // Should have 6 default actions
+        assert_eq!(defaults.len(), 6);
+    }
+
+    #[test]
+    fn test_default_quick_actions_have_unique_ids() {
+        let defaults = get_default_quick_actions();
+        let mut ids: Vec<&String> = defaults.iter().map(|a| &a.id).collect();
+        ids.sort();
+        ids.dedup();
+        assert_eq!(ids.len(), defaults.len());
+    }
+
+    #[test]
+    fn test_default_quick_actions_ids_start_with_default() {
+        let defaults = get_default_quick_actions();
+        assert!(defaults.iter().all(|a| a.id.starts_with("default-")));
+    }
+
+    #[test]
+    fn test_quick_action_serialization() {
+        let action = create_test_action("test-1", "Test Action", false);
+        let json = serde_json::to_string(&action).expect("Failed to serialize");
+        let parsed: QuickAction = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.id, action.id);
+        assert_eq!(parsed.name, action.name);
+        assert_eq!(parsed.prompt, action.prompt);
+        assert_eq!(parsed.icon, action.icon);
+        assert_eq!(parsed.is_default, action.is_default);
+    }
+
+    #[test]
+    fn test_quick_action_clone() {
+        let original = create_test_action("clone-test", "Clone Test", true);
+        let cloned = original.clone();
+
+        assert_eq!(original.id, cloned.id);
+        assert_eq!(original.name, cloned.name);
+        assert_eq!(original.is_default, cloned.is_default);
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_quick_action_sorting_defaults_first() {
+        let mut actions = vec![
+            create_test_action("custom-z", "Zebra", false),
+            create_test_action("default-a", "Apple", true),
+            create_test_action("custom-a", "Alpha", false),
+            create_test_action("default-z", "Zulu", true),
+        ];
+
+        // Sort by: defaults first, then alphabetically by name
+        actions.sort_by(|a, b| {
+            let default_cmp = b.is_default.cmp(&a.is_default);
+            if default_cmp == std::cmp::Ordering::Equal {
+                a.name.cmp(&b.name)
+            } else {
+                default_cmp
+            }
+        });
+
+        // Defaults should come first
+        assert!(actions[0].is_default);
+        assert!(actions[1].is_default);
+        assert!(!actions[2].is_default);
+        assert!(!actions[3].is_default);
+
+        // Within defaults, alphabetically sorted
+        assert_eq!(actions[0].name, "Apple");
+        assert_eq!(actions[1].name, "Zulu");
+
+        // Within non-defaults, alphabetically sorted
+        assert_eq!(actions[2].name, "Alpha");
+        assert_eq!(actions[3].name, "Zebra");
+    }
+
+    #[test]
+    fn test_known_default_actions() {
+        let defaults = get_default_quick_actions();
+        let ids: Vec<&str> = defaults.iter().map(|a| a.id.as_str()).collect();
+
+        assert!(ids.contains(&"default-review-pr"));
+        assert!(ids.contains(&"default-run-tests"));
+        assert!(ids.contains(&"default-explain-file"));
+        assert!(ids.contains(&"default-fix-error"));
+        assert!(ids.contains(&"default-write-tests"));
+        assert!(ids.contains(&"default-refactor"));
+    }
+
+    #[test]
+    fn test_default_action_icons() {
+        let defaults = get_default_quick_actions();
+        let icons: Vec<&str> = defaults.iter().map(|a| a.icon.as_str()).collect();
+
+        assert!(icons.contains(&"git-pull-request"));
+        assert!(icons.contains(&"play"));
+        assert!(icons.contains(&"file-text"));
+        assert!(icons.contains(&"alert-circle"));
+        assert!(icons.contains(&"check-square"));
+        assert!(icons.contains(&"refresh-cw"));
+    }
+
+    #[test]
+    fn test_quick_action_prompts_not_empty() {
+        let defaults = get_default_quick_actions();
+        for action in defaults {
+            assert!(
+                action.prompt.len() > 10,
+                "Prompt should be meaningful: {}",
+                action.name
+            );
+        }
+    }
+
+    #[test]
+    fn test_quick_action_timestamps() {
+        let action = create_test_action("time-test", "Time Test", false);
+        assert!(action.created_at <= action.updated_at);
+    }
+
+    #[test]
+    fn test_default_actions_have_same_timestamps() {
+        let defaults = get_default_quick_actions();
+        // All defaults are created at the same instant
+        let first_created = defaults[0].created_at;
+        let first_updated = defaults[0].updated_at;
+
+        for action in &defaults {
+            assert_eq!(action.created_at, first_created);
+            assert_eq!(action.updated_at, first_updated);
+        }
+    }
+
+    #[test]
+    fn test_action_retain_non_default() {
+        let mut actions = vec![
+            create_test_action("default-1", "Default 1", true),
+            create_test_action("custom-1", "Custom 1", false),
+            create_test_action("default-2", "Default 2", true),
+            create_test_action("custom-2", "Custom 2", false),
+        ];
+
+        // Mimics reset_default_quick_actions behavior (retain non-defaults)
+        actions.retain(|a| !a.is_default);
+
+        assert_eq!(actions.len(), 2);
+        assert!(actions.iter().all(|a| !a.is_default));
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_action_find_by_id() {
+        let actions = vec![
+            create_test_action("action-1", "First", false),
+            create_test_action("action-2", "Second", false),
+            create_test_action("action-3", "Third", false),
+        ];
+
+        let found = actions.iter().find(|a| a.id == "action-2");
+        assert!(found.is_some());
+        assert_eq!(found.unwrap().name, "Second");
+
+        let not_found = actions.iter().find(|a| a.id == "action-999");
+        assert!(not_found.is_none());
+    }
 }

src-tauri/src/sessions.rs

@@ -145,6 +145,30 @@ pub async fn clear_all_sessions(app: AppHandle) -> Result<(), String> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use chrono::TimeZone;
+
+    fn create_test_session(id: &str, name: &str) -> SavedSession {
+        SavedSession {
+            id: id.to_string(),
+            name: name.to_string(),
+            created_at: Utc::now(),
+            last_activity_at: Utc::now(),
+            working_directory: "/home/test".to_string(),
+            message_count: 5,
+            preview: "Hello world".to_string(),
+            messages: vec![],
+        }
+    }
+
+    fn create_test_message(id: &str, content: &str, msg_type: &str) -> SavedMessage {
+        SavedMessage {
+            id: id.to_string(),
+            message_type: msg_type.to_string(),
+            content: content.to_string(),
+            timestamp: Utc::now(),
+            tool_name: None,
+        }
+    }
 
     #[test]
     fn test_session_list_item_from_saved_session() {
@@ -164,4 +188,187 @@ mod tests {
         assert_eq!(item.name, "Test Session");
         assert_eq!(item.message_count, 5);
     }
+
+    #[test]
+    fn test_session_list_item_preserves_all_fields() {
+        let created = Utc.with_ymd_and_hms(2024, 1, 15, 10, 30, 0).unwrap();
+        let last_activity = Utc.with_ymd_and_hms(2024, 1, 15, 14, 45, 0).unwrap();
+
+        let session = SavedSession {
+            id: "sess-123".to_string(),
+            name: "My Chat".to_string(),
+            created_at: created,
+            last_activity_at: last_activity,
+            working_directory: "/home/naomi/project".to_string(),
+            message_count: 42,
+            preview: "What is the meaning of life?".to_string(),
+            messages: vec![],
+        };
+
+        let item = SessionListItem::from(&session);
+
+        assert_eq!(item.id, "sess-123");
+        assert_eq!(item.name, "My Chat");
+        assert_eq!(item.created_at, created);
+        assert_eq!(item.last_activity_at, last_activity);
+        assert_eq!(item.working_directory, "/home/naomi/project");
+        assert_eq!(item.message_count, 42);
+        assert_eq!(item.preview, "What is the meaning of life?");
+    }
+
+    #[test]
+    fn test_saved_session_serialization() {
+        let session = create_test_session("test-1", "Test Session");
+        let json = serde_json::to_string(&session).expect("Failed to serialize");
+        let parsed: SavedSession = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.id, session.id);
+        assert_eq!(parsed.name, session.name);
+        assert_eq!(parsed.working_directory, session.working_directory);
+    }
+
+    #[test]
+    fn test_saved_message_serialization() {
+        let message = create_test_message("msg-1", "Hello!", "user");
+        let json = serde_json::to_string(&message).expect("Failed to serialize");
+        let parsed: SavedMessage = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.id, message.id);
+        assert_eq!(parsed.content, message.content);
+        assert_eq!(parsed.message_type, "user");
+    }
+
+    #[test]
+    fn test_saved_message_with_tool_name() {
+        let message = SavedMessage {
+            id: "msg-tool-1".to_string(),
+            message_type: "tool".to_string(),
+            content: "File read successfully".to_string(),
+            timestamp: Utc::now(),
+            tool_name: Some("Read".to_string()),
+        };
+
+        let json = serde_json::to_string(&message).expect("Failed to serialize");
+        let parsed: SavedMessage = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.tool_name, Some("Read".to_string()));
+    }
+
+    #[test]
+    fn test_session_with_messages_serialization() {
+        let mut session = create_test_session("sess-full", "Full Session");
+        session.messages = vec![
+            create_test_message("msg-1", "Hello!", "user"),
+            create_test_message("msg-2", "Hi there!", "assistant"),
+            create_test_message("msg-3", "Read file", "tool"),
+        ];
+        session.message_count = 3;
+
+        let json = serde_json::to_string(&session).expect("Failed to serialize");
+        let parsed: SavedSession = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.messages.len(), 3);
+        assert_eq!(parsed.messages[0].content, "Hello!");
+        assert_eq!(parsed.messages[1].message_type, "assistant");
+        assert_eq!(parsed.messages[2].message_type, "tool");
+    }
+
+    #[test]
+    fn test_session_list_item_serialization() {
+        let item = SessionListItem {
+            id: "list-item-1".to_string(),
+            name: "Quick Chat".to_string(),
+            created_at: Utc::now(),
+            last_activity_at: Utc::now(),
+            working_directory: "/tmp".to_string(),
+            message_count: 10,
+            preview: "Short preview...".to_string(),
+        };
+
+        let json = serde_json::to_string(&item).expect("Failed to serialize");
+        let parsed: SessionListItem = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.id, item.id);
+        assert_eq!(parsed.name, item.name);
+        assert_eq!(parsed.preview, item.preview);
+    }
+
+    #[test]
+    fn test_message_type_field_rename() {
+        // The message_type field is renamed to "type" in JSON
+        let message = create_test_message("msg-1", "Test", "assistant");
+        let json = serde_json::to_string(&message).expect("Failed to serialize");
+
+        assert!(json.contains("\"type\":"));
+        assert!(!json.contains("\"message_type\":"));
+    }
+
+    #[test]
+    fn test_session_default_empty_messages() {
+        let session = SavedSession {
+            id: "empty".to_string(),
+            name: "Empty".to_string(),
+            created_at: Utc::now(),
+            last_activity_at: Utc::now(),
+            working_directory: "/".to_string(),
+            message_count: 0,
+            preview: "".to_string(),
+            messages: vec![],
+        };
+
+        assert!(session.messages.is_empty());
+        assert_eq!(session.message_count, 0);
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_session_sorting_by_activity() {
+        let old_time = Utc.with_ymd_and_hms(2024, 1, 1, 0, 0, 0).unwrap();
+        let new_time = Utc.with_ymd_and_hms(2024, 6, 15, 12, 0, 0).unwrap();
+
+        let mut sessions = vec![
+            SessionListItem {
+                id: "old".to_string(),
+                name: "Old Session".to_string(),
+                created_at: old_time,
+                last_activity_at: old_time,
+                working_directory: "/old".to_string(),
+                message_count: 1,
+                preview: "Old".to_string(),
+            },
+            SessionListItem {
+                id: "new".to_string(),
+                name: "New Session".to_string(),
+                created_at: new_time,
+                last_activity_at: new_time,
+                working_directory: "/new".to_string(),
+                message_count: 1,
+                preview: "New".to_string(),
+            },
+        ];
+
+        // Sort by last activity, most recent first (mimics list_sessions behavior)
+        sessions.sort_by(|a, b| b.last_activity_at.cmp(&a.last_activity_at));
+
+        assert_eq!(sessions[0].id, "new");
+        assert_eq!(sessions[1].id, "old");
+    }
+
+    #[test]
+    fn test_session_clone() {
+        let original = create_test_session("clone-test", "Clone Test");
+        let cloned = original.clone();
+
+        assert_eq!(original.id, cloned.id);
+        assert_eq!(original.name, cloned.name);
+    }
+
+    #[test]
+    fn test_message_clone() {
+        let original = create_test_message("msg-clone", "Content", "user");
+        let cloned = original.clone();
+
+        assert_eq!(original.id, cloned.id);
+        assert_eq!(original.content, cloned.content);
+    }
 }

src-tauri/src/snippets.rs

@@ -205,6 +205,19 @@ pub async fn reset_default_snippets(app: AppHandle) -> Result<(), String> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use std::collections::HashSet;
+
+    fn create_test_snippet(id: &str, name: &str, category: &str, is_default: bool) -> Snippet {
+        Snippet {
+            id: id.to_string(),
+            name: name.to_string(),
+            content: "Test content".to_string(),
+            category: category.to_string(),
+            is_default,
+            created_at: Utc::now(),
+            updated_at: Utc::now(),
+        }
+    }
 
     #[test]
     fn test_default_snippets_exist() {
@@ -223,4 +236,204 @@ mod tests {
             assert!(!snippet.category.is_empty());
         }
     }
+
+    #[test]
+    fn test_default_snippets_count() {
+        let defaults = get_default_snippets();
+        // Should have 8 default snippets
+        assert_eq!(defaults.len(), 8);
+    }
+
+    #[test]
+    fn test_default_snippets_have_unique_ids() {
+        let defaults = get_default_snippets();
+        let ids: HashSet<&String> = defaults.iter().map(|s| &s.id).collect();
+        assert_eq!(ids.len(), defaults.len());
+    }
+
+    #[test]
+    fn test_default_snippets_ids_start_with_default() {
+        let defaults = get_default_snippets();
+        assert!(defaults.iter().all(|s| s.id.starts_with("default-")));
+    }
+
+    #[test]
+    fn test_snippet_serialization() {
+        let snippet = create_test_snippet("test-1", "Test Snippet", "Testing", false);
+        let json = serde_json::to_string(&snippet).expect("Failed to serialize");
+        let parsed: Snippet = serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(parsed.id, snippet.id);
+        assert_eq!(parsed.name, snippet.name);
+        assert_eq!(parsed.content, snippet.content);
+        assert_eq!(parsed.category, snippet.category);
+        assert_eq!(parsed.is_default, snippet.is_default);
+    }
+
+    #[test]
+    fn test_snippet_clone() {
+        let original = create_test_snippet("clone-test", "Clone Test", "Category", true);
+        let cloned = original.clone();
+
+        assert_eq!(original.id, cloned.id);
+        assert_eq!(original.name, cloned.name);
+        assert_eq!(original.is_default, cloned.is_default);
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_snippet_sorting_by_category_then_name() {
+        let mut snippets = vec![
+            create_test_snippet("s1", "Zebra", "B-Category", false),
+            create_test_snippet("s2", "Apple", "A-Category", false),
+            create_test_snippet("s3", "Banana", "B-Category", false),
+            create_test_snippet("s4", "Alpha", "A-Category", false),
+        ];
+
+        // Sort by category, then by name (mimics list_snippets behavior)
+        snippets.sort_by(|a, b| {
+            let cat_cmp = a.category.cmp(&b.category);
+            if cat_cmp == std::cmp::Ordering::Equal {
+                a.name.cmp(&b.name)
+            } else {
+                cat_cmp
+            }
+        });
+
+        // A-Category should come first
+        assert_eq!(snippets[0].category, "A-Category");
+        assert_eq!(snippets[1].category, "A-Category");
+        assert_eq!(snippets[2].category, "B-Category");
+        assert_eq!(snippets[3].category, "B-Category");
+
+        // Within categories, alphabetically by name
+        assert_eq!(snippets[0].name, "Alpha");
+        assert_eq!(snippets[1].name, "Apple");
+        assert_eq!(snippets[2].name, "Banana");
+        assert_eq!(snippets[3].name, "Zebra");
+    }
+
+    #[test]
+    fn test_known_default_snippets() {
+        let defaults = get_default_snippets();
+        let ids: Vec<&str> = defaults.iter().map(|s| s.id.as_str()).collect();
+
+        assert!(ids.contains(&"default-explain-code"));
+        assert!(ids.contains(&"default-fix-error"));
+        assert!(ids.contains(&"default-write-tests"));
+        assert!(ids.contains(&"default-refactor"));
+        assert!(ids.contains(&"default-optimize"));
+        assert!(ids.contains(&"default-review-pr"));
+        assert!(ids.contains(&"default-add-comments"));
+        assert!(ids.contains(&"default-security-review"));
+    }
+
+    #[test]
+    fn test_default_snippet_categories() {
+        let defaults = get_default_snippets();
+        let categories: HashSet<&String> = defaults.iter().map(|s| &s.category).collect();
+
+        assert!(categories.contains(&"Code Review".to_string()));
+        assert!(categories.contains(&"Debugging".to_string()));
+        assert!(categories.contains(&"Testing".to_string()));
+        assert!(categories.contains(&"Performance".to_string()));
+        assert!(categories.contains(&"Documentation".to_string()));
+        assert!(categories.contains(&"Security".to_string()));
+    }
+
+    #[test]
+    fn test_snippet_content_not_empty() {
+        let defaults = get_default_snippets();
+        for snippet in defaults {
+            assert!(
+                snippet.content.len() > 10,
+                "Content should be meaningful: {}",
+                snippet.name
+            );
+        }
+    }
+
+    #[test]
+    fn test_snippet_timestamps() {
+        let snippet = create_test_snippet("time-test", "Time Test", "Cat", false);
+        assert!(snippet.created_at <= snippet.updated_at);
+    }
+
+    #[test]
+    fn test_default_snippets_have_same_timestamps() {
+        let defaults = get_default_snippets();
+        // All defaults are created at the same instant
+        let first_created = defaults[0].created_at;
+        let first_updated = defaults[0].updated_at;
+
+        for snippet in &defaults {
+            assert_eq!(snippet.created_at, first_created);
+            assert_eq!(snippet.updated_at, first_updated);
+        }
+    }
+
+    #[test]
+    fn test_snippet_retain_non_default() {
+        let mut snippets = vec![
+            create_test_snippet("default-1", "Default 1", "Cat", true),
+            create_test_snippet("custom-1", "Custom 1", "Cat", false),
+            create_test_snippet("default-2", "Default 2", "Cat", true),
+            create_test_snippet("custom-2", "Custom 2", "Cat", false),
+        ];
+
+        // Mimics reset_default_snippets behavior (retain non-defaults)
+        snippets.retain(|s| !s.is_default);
+
+        assert_eq!(snippets.len(), 2);
+        assert!(snippets.iter().all(|s| !s.is_default));
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_snippet_find_by_id() {
+        let snippets = vec![
+            create_test_snippet("snippet-1", "First", "Cat", false),
+            create_test_snippet("snippet-2", "Second", "Cat", false),
+            create_test_snippet("snippet-3", "Third", "Cat", false),
+        ];
+
+        let found = snippets.iter().find(|s| s.id == "snippet-2");
+        assert!(found.is_some());
+        assert_eq!(found.unwrap().name, "Second");
+
+        let not_found = snippets.iter().find(|s| s.id == "snippet-999");
+        assert!(not_found.is_none());
+    }
+
+    #[test]
+    #[allow(clippy::useless_vec)]
+    fn test_extract_categories_sorted_and_deduped() {
+        let snippets = vec![
+            create_test_snippet("s1", "S1", "Zebra", false),
+            create_test_snippet("s2", "S2", "Alpha", false),
+            create_test_snippet("s3", "S3", "Beta", false),
+            create_test_snippet("s4", "S4", "Alpha", false), // Duplicate
+        ];
+
+        let mut categories: Vec<String> = snippets.iter().map(|s| s.category.clone()).collect();
+        categories.sort();
+        categories.dedup();
+
+        assert_eq!(categories.len(), 3);
+        assert_eq!(categories[0], "Alpha");
+        assert_eq!(categories[1], "Beta");
+        assert_eq!(categories[2], "Zebra");
+    }
+
+    #[test]
+    fn test_snippet_category_code_review_count() {
+        let defaults = get_default_snippets();
+        let code_review_count = defaults
+            .iter()
+            .filter(|s| s.category == "Code Review")
+            .count();
+
+        // There should be multiple code review snippets
+        assert!(code_review_count >= 2);
+    }
 }

src-tauri/src/temp_manager.rs

@@ -137,3 +137,290 @@ pub type SharedTempFileManager = Arc<Mutex<TempFileManager>>;
 pub fn create_shared_temp_manager() -> Result<SharedTempFileManager, String> {
     Ok(Arc::new(Mutex::new(TempFileManager::new()?)))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs;
+    use tempfile::TempDir;
+
+    // Helper to create a TempFileManager with a custom base directory for testing
+    fn create_test_manager(base_dir: PathBuf) -> TempFileManager {
+        if !base_dir.exists() {
+            fs::create_dir_all(&base_dir).expect("Failed to create test temp dir");
+        }
+        TempFileManager {
+            base_dir,
+            files: HashMap::new(),
+        }
+    }
+
+    #[test]
+    fn test_new_creates_base_directory() {
+        let manager = TempFileManager::new().expect("Failed to create TempFileManager");
+        assert!(manager.base_dir.exists());
+    }
+
+    #[test]
+    fn test_get_base_dir_returns_correct_path() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let manager = create_test_manager(base_path.clone());
+
+        assert_eq!(manager.get_base_dir(), base_path.as_path());
+    }
+
+    #[test]
+    fn test_save_file_creates_file_with_content() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"Hello, world!";
+        let result = manager.save_file("conv-1", data, Some("test.txt"));
+
+        assert!(result.is_ok());
+        let file_path = result.unwrap();
+        assert!(file_path.exists());
+
+        let content = fs::read(&file_path).expect("Failed to read file");
+        assert_eq!(content, data);
+    }
+
+    #[test]
+    fn test_save_file_uses_correct_extension() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"test data";
+        let result = manager.save_file("conv-1", data, Some("document.pdf"));
+
+        assert!(result.is_ok());
+        let file_path = result.unwrap();
+        assert_eq!(file_path.extension().unwrap(), "pdf");
+    }
+
+    #[test]
+    fn test_save_file_uses_bin_extension_when_no_filename() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"binary data";
+        let result = manager.save_file("conv-1", data, None);
+
+        assert!(result.is_ok());
+        let file_path = result.unwrap();
+        assert_eq!(file_path.extension().unwrap(), "bin");
+    }
+
+    #[test]
+    fn test_register_file_tracks_file_path() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let file_path = PathBuf::from("/some/path/file.txt");
+        manager.register_file("conv-1", file_path.clone());
+
+        let files = manager.get_files_for_conversation("conv-1");
+        assert_eq!(files.len(), 1);
+        assert_eq!(files[0], file_path);
+    }
+
+    #[test]
+    fn test_get_files_for_conversation_returns_empty_for_unknown() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let manager = create_test_manager(base_path);
+
+        let files = manager.get_files_for_conversation("unknown-conv");
+        assert!(files.is_empty());
+    }
+
+    #[test]
+    fn test_get_files_for_conversation_returns_all_files() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"test";
+        manager.save_file("conv-1", data, Some("file1.txt")).unwrap();
+        manager.save_file("conv-1", data, Some("file2.txt")).unwrap();
+        manager.save_file("conv-2", data, Some("file3.txt")).unwrap();
+
+        let files_conv1 = manager.get_files_for_conversation("conv-1");
+        let files_conv2 = manager.get_files_for_conversation("conv-2");
+
+        assert_eq!(files_conv1.len(), 2);
+        assert_eq!(files_conv2.len(), 1);
+    }
+
+    #[test]
+    fn test_cleanup_conversation_removes_files() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"test";
+        let file_path = manager.save_file("conv-1", data, Some("test.txt")).unwrap();
+        assert!(file_path.exists());
+
+        let result = manager.cleanup_conversation("conv-1");
+        assert!(result.is_ok());
+        assert!(!file_path.exists());
+        assert!(manager.get_files_for_conversation("conv-1").is_empty());
+    }
+
+    #[test]
+    fn test_cleanup_conversation_handles_missing_files() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        // Register a file that doesn't exist
+        manager.register_file("conv-1", PathBuf::from("/nonexistent/file.txt"));
+
+        // Should not error, just skip missing files
+        let result = manager.cleanup_conversation("conv-1");
+        assert!(result.is_ok());
+    }
+
+    #[test]
+    fn test_cleanup_conversation_for_unknown_returns_ok() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let result = manager.cleanup_conversation("unknown-conv");
+        assert!(result.is_ok());
+    }
+
+    #[test]
+    fn test_cleanup_all_removes_all_files() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"test";
+        let file1 = manager.save_file("conv-1", data, Some("f1.txt")).unwrap();
+        let file2 = manager.save_file("conv-2", data, Some("f2.txt")).unwrap();
+
+        assert!(file1.exists());
+        assert!(file2.exists());
+
+        let result = manager.cleanup_all();
+        assert!(result.is_ok());
+
+        assert!(!file1.exists());
+        assert!(!file2.exists());
+        assert!(manager.files.is_empty());
+    }
+
+    #[test]
+    fn test_cleanup_orphaned_files_removes_untracked() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path.clone());
+
+        // Create a tracked file
+        let data = b"tracked";
+        let tracked_path = manager.save_file("conv-1", data, Some("tracked.txt")).unwrap();
+
+        // Create an untracked (orphaned) file directly in the temp directory
+        let orphan_path = base_path.join("orphan.txt");
+        fs::write(&orphan_path, b"orphan").expect("Failed to create orphan file");
+
+        assert!(tracked_path.exists());
+        assert!(orphan_path.exists());
+
+        let result = manager.cleanup_orphaned_files();
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), 1); // One orphan removed
+
+        assert!(tracked_path.exists()); // Tracked file still exists
+        assert!(!orphan_path.exists()); // Orphan removed
+    }
+
+    #[test]
+    fn test_cleanup_orphaned_returns_zero_when_none() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let data = b"test";
+        manager.save_file("conv-1", data, Some("test.txt")).unwrap();
+
+        let result = manager.cleanup_orphaned_files();
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), 0);
+    }
+
+    #[test]
+    fn test_cleanup_orphaned_returns_zero_when_dir_missing() {
+        let mut manager = TempFileManager {
+            base_dir: PathBuf::from("/nonexistent/dir"),
+            files: HashMap::new(),
+        };
+
+        let result = manager.cleanup_orphaned_files();
+        assert!(result.is_ok());
+        assert_eq!(result.unwrap(), 0);
+    }
+
+    #[test]
+    fn test_default_creates_manager() {
+        // Default should work as long as we can create temp directories
+        let manager = TempFileManager::default();
+        assert!(manager.base_dir.exists());
+    }
+
+    #[test]
+    fn test_create_shared_temp_manager() {
+        let result = create_shared_temp_manager();
+        assert!(result.is_ok());
+
+        let shared = result.unwrap();
+        let manager = shared.lock();
+        assert!(manager.base_dir.exists());
+    }
+
+    #[test]
+    fn test_multiple_files_same_conversation() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        // Save multiple files to same conversation
+        for i in 0..5 {
+            let data = format!("content {}", i);
+            manager
+                .save_file("conv-1", data.as_bytes(), Some(&format!("file{}.txt", i)))
+                .unwrap();
+        }
+
+        let files = manager.get_files_for_conversation("conv-1");
+        assert_eq!(files.len(), 5);
+
+        // Each file should have unique content
+        for (i, file_path) in files.iter().enumerate() {
+            let content = fs::read_to_string(file_path).expect("Failed to read");
+            assert_eq!(content, format!("content {}", i));
+        }
+    }
+
+    #[test]
+    fn test_file_paths_contain_conversation_id() {
+        let temp_dir = TempDir::new().expect("Failed to create temp dir");
+        let base_path = temp_dir.path().join("hikari-test");
+        let mut manager = create_test_manager(base_path);
+
+        let file_path = manager
+            .save_file("my-conversation-id", b"test", Some("test.txt"))
+            .unwrap();
+
+        let filename = file_path.file_name().unwrap().to_str().unwrap();
+        assert!(filename.starts_with("my-conversation-id_"));
+    }
+}

src-tauri/src/tool_cache.rs

@@ -0,0 +1,266 @@
+use serde::{Deserialize, Serialize};
+use std::collections::hash_map::DefaultHasher;
+use std::collections::HashMap;
+use std::hash::{Hash, Hasher};
+
+/// Tools that could benefit from caching
+#[allow(dead_code)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CacheableTool {
+    Read,
+    Glob,
+    Grep,
+}
+
+impl CacheableTool {
+    #[allow(dead_code)]
+    pub fn from_name(name: &str) -> Option<Self> {
+        match name {
+            "Read" => Some(Self::Read),
+            "Glob" => Some(Self::Glob),
+            "Grep" => Some(Self::Grep),
+            _ => None,
+        }
+    }
+}
+
+/// Statistics about potential cache savings
+#[allow(dead_code)]
+#[derive(Debug, Default, Clone, Serialize, Deserialize)]
+pub struct CacheAnalytics {
+    /// Number of tool calls that could have been cache hits
+    pub potential_cache_hits: u64,
+    /// Estimated tokens that could have been saved
+    pub potential_savings_tokens: u64,
+    /// Tracks unique tool invocations: hash -> (tool_name, call_count)
+    #[serde(skip)]
+    recent_invocations: HashMap<u64, (String, u64)>,
+}
+
+#[allow(dead_code)]
+impl CacheAnalytics {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Compute a hash key from tool name and input
+    fn compute_key(tool_name: &str, input: &serde_json::Value) -> u64 {
+        let mut hasher = DefaultHasher::new();
+        tool_name.hash(&mut hasher);
+        input.to_string().hash(&mut hasher);
+        hasher.finish()
+    }
+
+    /// Track a tool invocation for analytics
+    /// Returns true if this was a repeated invocation (potential cache hit)
+    pub fn track_invocation(
+        &mut self,
+        tool_name: &str,
+        input: &serde_json::Value,
+        estimated_tokens: u64,
+    ) -> bool {
+        // Only track cacheable tools
+        if CacheableTool::from_name(tool_name).is_none() {
+            return false;
+        }
+
+        let key = Self::compute_key(tool_name, input);
+
+        if let Some((_, count)) = self.recent_invocations.get_mut(&key) {
+            *count += 1;
+            // This is a repeat - could have been a cache hit
+            self.potential_cache_hits += 1;
+            self.potential_savings_tokens += estimated_tokens;
+            true
+        } else {
+            self.recent_invocations
+                .insert(key, (tool_name.to_string(), 1));
+            false
+        }
+    }
+
+    /// Get the number of unique tool invocations being tracked
+    pub fn unique_invocations(&self) -> usize {
+        self.recent_invocations.len()
+    }
+
+    /// Get invocations that were called more than once
+    pub fn repeated_invocations(&self) -> Vec<(&str, u64)> {
+        self.recent_invocations
+            .values()
+            .filter(|(_, count)| *count > 1)
+            .map(|(name, count)| (name.as_str(), *count))
+            .collect()
+    }
+
+    /// Clear session analytics (keep totals)
+    pub fn clear_session(&mut self) {
+        self.recent_invocations.clear();
+    }
+
+    /// Fully reset all analytics
+    pub fn reset(&mut self) {
+        self.potential_cache_hits = 0;
+        self.potential_savings_tokens = 0;
+        self.recent_invocations.clear();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    #[test]
+    fn test_cacheable_tool_from_name() {
+        assert_eq!(CacheableTool::from_name("Read"), Some(CacheableTool::Read));
+        assert_eq!(CacheableTool::from_name("Glob"), Some(CacheableTool::Glob));
+        assert_eq!(CacheableTool::from_name("Grep"), Some(CacheableTool::Grep));
+        assert_eq!(CacheableTool::from_name("Bash"), None);
+        assert_eq!(CacheableTool::from_name("Edit"), None);
+        assert_eq!(CacheableTool::from_name("Write"), None);
+    }
+
+    #[test]
+    fn test_first_invocation_not_cache_hit() {
+        let mut analytics = CacheAnalytics::new();
+        let input = json!({"file_path": "/home/test/file.txt"});
+
+        let is_repeat = analytics.track_invocation("Read", &input, 100);
+
+        assert!(!is_repeat);
+        assert_eq!(analytics.potential_cache_hits, 0);
+        assert_eq!(analytics.potential_savings_tokens, 0);
+    }
+
+    #[test]
+    fn test_second_invocation_is_cache_hit() {
+        let mut analytics = CacheAnalytics::new();
+        let input = json!({"file_path": "/home/test/file.txt"});
+
+        analytics.track_invocation("Read", &input, 100);
+        let is_repeat = analytics.track_invocation("Read", &input, 100);
+
+        assert!(is_repeat);
+        assert_eq!(analytics.potential_cache_hits, 1);
+        assert_eq!(analytics.potential_savings_tokens, 100);
+    }
+
+    #[test]
+    fn test_different_inputs_not_cache_hit() {
+        let mut analytics = CacheAnalytics::new();
+        let input1 = json!({"file_path": "/home/test/file1.txt"});
+        let input2 = json!({"file_path": "/home/test/file2.txt"});
+
+        analytics.track_invocation("Read", &input1, 100);
+        let is_repeat = analytics.track_invocation("Read", &input2, 100);
+
+        assert!(!is_repeat);
+        assert_eq!(analytics.potential_cache_hits, 0);
+    }
+
+    #[test]
+    fn test_non_cacheable_tool_ignored() {
+        let mut analytics = CacheAnalytics::new();
+        let input = json!({"command": "ls -la"});
+
+        let is_repeat = analytics.track_invocation("Bash", &input, 100);
+        analytics.track_invocation("Bash", &input, 100);
+
+        assert!(!is_repeat);
+        assert_eq!(analytics.potential_cache_hits, 0);
+        assert_eq!(analytics.unique_invocations(), 0);
+    }
+
+    #[test]
+    fn test_multiple_repeated_invocations() {
+        let mut analytics = CacheAnalytics::new();
+        let input = json!({"file_path": "/home/test/file.txt"});
+
+        analytics.track_invocation("Read", &input, 100);
+        analytics.track_invocation("Read", &input, 100);
+        analytics.track_invocation("Read", &input, 100);
+
+        assert_eq!(analytics.potential_cache_hits, 2);
+        assert_eq!(analytics.potential_savings_tokens, 200);
+    }
+
+    #[test]
+    fn test_unique_invocations_count() {
+        let mut analytics = CacheAnalytics::new();
+
+        analytics.track_invocation("Read", &json!({"file_path": "/file1.txt"}), 100);
+        analytics.track_invocation("Read", &json!({"file_path": "/file2.txt"}), 100);
+        analytics.track_invocation("Glob", &json!({"pattern": "*.rs"}), 50);
+
+        assert_eq!(analytics.unique_invocations(), 3);
+    }
+
+    #[test]
+    fn test_repeated_invocations_list() {
+        let mut analytics = CacheAnalytics::new();
+
+        // file1 read twice
+        analytics.track_invocation("Read", &json!({"file_path": "/file1.txt"}), 100);
+        analytics.track_invocation("Read", &json!({"file_path": "/file1.txt"}), 100);
+
+        // file2 read once
+        analytics.track_invocation("Read", &json!({"file_path": "/file2.txt"}), 100);
+
+        // glob run 3 times
+        analytics.track_invocation("Glob", &json!({"pattern": "*.rs"}), 50);
+        analytics.track_invocation("Glob", &json!({"pattern": "*.rs"}), 50);
+        analytics.track_invocation("Glob", &json!({"pattern": "*.rs"}), 50);
+
+        let repeated = analytics.repeated_invocations();
+        assert_eq!(repeated.len(), 2); // file1 and glob pattern
+    }
+
+    #[test]
+    fn test_clear_session() {
+        let mut analytics = CacheAnalytics::new();
+        let input = json!({"file_path": "/file.txt"});
+
+        analytics.track_invocation("Read", &input, 100);
+        analytics.track_invocation("Read", &input, 100);
+
+        assert_eq!(analytics.potential_cache_hits, 1);
+        assert_eq!(analytics.unique_invocations(), 1);
+
+        analytics.clear_session();
+
+        assert_eq!(analytics.potential_cache_hits, 1); // Preserved
+        assert_eq!(analytics.unique_invocations(), 0); // Cleared
+    }
+
+    #[test]
+    fn test_reset() {
+        let mut analytics = CacheAnalytics::new();
+        let input = json!({"file_path": "/file.txt"});
+
+        analytics.track_invocation("Read", &input, 100);
+        analytics.track_invocation("Read", &input, 100);
+
+        analytics.reset();
+
+        assert_eq!(analytics.potential_cache_hits, 0);
+        assert_eq!(analytics.potential_savings_tokens, 0);
+        assert_eq!(analytics.unique_invocations(), 0);
+    }
+
+    #[test]
+    fn test_serialization() {
+        let mut analytics = CacheAnalytics::new();
+        analytics.potential_cache_hits = 10;
+        analytics.potential_savings_tokens = 500;
+
+        let json = serde_json::to_string(&analytics).expect("Failed to serialize");
+        let deserialized: CacheAnalytics =
+            serde_json::from_str(&json).expect("Failed to deserialize");
+
+        assert_eq!(deserialized.potential_cache_hits, 10);
+        assert_eq!(deserialized.potential_savings_tokens, 500);
+        // recent_invocations is skipped in serialization
+        assert_eq!(deserialized.unique_invocations(), 0);
+    }
+}

src-tauri/src/types.rs

@@ -176,6 +176,14 @@ pub struct StateChangeEvent {
     pub conversation_id: Option<String>,
 }
 
+/// Cost information for a message
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct MessageCost {
+    pub input_tokens: u64,
+    pub output_tokens: u64,
+    pub cost_usd: f64,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct OutputEvent {
     pub line_type: String,
@@ -183,6 +191,8 @@ pub struct OutputEvent {
     pub tool_name: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub conversation_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub cost: Option<MessageCost>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -354,10 +364,31 @@ mod tests {
             content: "Test output".to_string(),
             tool_name: None,
             conversation_id: None,
+            cost: None,
         };
 
         let serialized = serde_json::to_string(&event).unwrap();
         assert!(serialized.contains("\"line_type\":\"assistant\""));
         assert!(serialized.contains("\"content\":\"Test output\""));
     }
+
+    #[test]
+    fn test_output_event_with_cost() {
+        let event = OutputEvent {
+            line_type: "assistant".to_string(),
+            content: "Test output".to_string(),
+            tool_name: None,
+            conversation_id: Some("conv-123".to_string()),
+            cost: Some(MessageCost {
+                input_tokens: 100,
+                output_tokens: 50,
+                cost_usd: 0.005,
+            }),
+        };
+
+        let serialized = serde_json::to_string(&event).unwrap();
+        assert!(serialized.contains("\"cost\":"));
+        assert!(serialized.contains("\"input_tokens\":100"));
+        assert!(serialized.contains("\"output_tokens\":50"));
+    }
 }

src-tauri/src/wsl_bridge.rs

@@ -9,12 +9,13 @@ use tempfile::NamedTempFile;
 use std::os::windows::process::CommandExt;
 
 use crate::achievements::{get_achievement_info, AchievementUnlockedEvent};
+use crate::commands::record_cost;
 use crate::config::ClaudeStartOptions;
-use crate::stats::{StatsUpdateEvent, UsageStats};
+use crate::stats::{calculate_cost, StatsUpdateEvent, UsageStats};
 use crate::types::{
-    CharacterState, ClaudeMessage, ConnectionEvent, ConnectionStatus, ContentBlock, OutputEvent,
+    CharacterState, ClaudeMessage, ConnectionEvent, ConnectionStatus, ContentBlock, MessageCost,
-    PermissionPromptEvent, QuestionOption, SessionEvent, StateChangeEvent, UserQuestionEvent,
+    OutputEvent, PermissionPromptEvent, QuestionOption, SessionEvent, StateChangeEvent,
-    WorkingDirectoryEvent,
+    UserQuestionEvent, WorkingDirectoryEvent,
 };
 use parking_lot::RwLock;
 
@@ -534,6 +535,7 @@ fn handle_stderr(
                         content: line,
                         tool_name: None,
                         conversation_id: conversation_id.clone(),
+                        cost: None,
                     },
                 );
             }
@@ -586,17 +588,57 @@ fn process_json_line(
             let mut state = CharacterState::Typing;
             let mut tool_name = None;
 
+            // Collect all tool names in this message for token attribution
+            let tools_in_message: Vec<String> = message
+                .content
+                .iter()
+                .filter_map(|block| match block {
+                    ContentBlock::ToolUse { name, .. } => Some(name.clone()),
+                    _ => None,
+                })
+                .collect();
+
+            // Track message cost for display
+            let mut message_cost: Option<MessageCost> = None;
+
             // Only update stats if we have usage information
             if let Some(usage) = &message.usage {
                 if let Some(model) = &message.model {
+                    // Calculate cost for historical tracking
+                    let cost_usd = calculate_cost(usage.input_tokens, usage.output_tokens, model);
+
+                    // Store cost for later use in output events
+                    message_cost = Some(MessageCost {
+                        input_tokens: usage.input_tokens,
+                        output_tokens: usage.output_tokens,
+                        cost_usd,
+                    });
+
                     // Batch all stats updates in a single write lock
                     {
                         let mut stats_guard = stats.write();
                         stats_guard.increment_messages();
                         stats_guard.add_usage(usage.input_tokens, usage.output_tokens, model);
                         stats_guard.get_session_duration();
+
+                        // Attribute tokens to tools if any tools were used in this message
+                        if !tools_in_message.is_empty() {
+                            let per_tool_input = usage.input_tokens / tools_in_message.len() as u64;
+                            let per_tool_output = usage.output_tokens / tools_in_message.len() as u64;
+                            for tool in &tools_in_message {
+                                stats_guard.add_tool_tokens(tool, per_tool_input, per_tool_output);
+                            }
+                        }
                     }
 
+                    // Record to historical cost tracking
+                    let app_clone = app.clone();
+                    let input = usage.input_tokens;
+                    let output = usage.output_tokens;
+                    tauri::async_runtime::spawn(async move {
+                        record_cost(&app_clone, input, output, cost_usd).await;
+                    });
+
                     // Don't emit here - we'll emit on Result message instead
                     // This reduces the frequency of updates
                 } else {
@@ -635,6 +677,7 @@ fn process_json_line(
                                 content: desc,
                                 tool_name: Some(name.clone()),
                                 conversation_id: conversation_id.clone(),
+                                cost: None, // Tool use doesn't have separate cost
                             },
                         );
                     }
@@ -652,6 +695,7 @@ fn process_json_line(
                                 content: text.clone(),
                                 tool_name: None,
                                 conversation_id: conversation_id.clone(),
+                                cost: message_cost.clone(), // Include cost with assistant text
                             },
                         );
                     }
@@ -664,6 +708,7 @@ fn process_json_line(
                                 content: format!("[Thinking] {}", thinking),
                                 tool_name: None,
                                 conversation_id: conversation_id.clone(),
+                                cost: None,
                             },
                         );
                     }
@@ -704,7 +749,7 @@ fn process_json_line(
             subtype,
             result,
             permission_denials,
-            usage: _,
+            usage,
             ..
         } => {
             let state = if subtype == "success" {
@@ -713,6 +758,32 @@ fn process_json_line(
                 CharacterState::Error
             };
 
+            // Track token usage from Result messages if available
+            // This captures tokens from tool outputs and other operations
+            if let Some(usage_info) = usage {
+                // We need the model info to calculate cost properly
+                // For now, use the last known model from stats
+                let model = {
+                    let stats_guard = stats.read();
+                    stats_guard.model.clone().unwrap_or_else(|| "claude-opus-4-20250514".to_string())
+                };
+
+                // Calculate cost for historical tracking
+                let cost_usd = calculate_cost(usage_info.input_tokens, usage_info.output_tokens, &model);
+
+                let mut stats_guard = stats.write();
+                stats_guard.add_usage(usage_info.input_tokens, usage_info.output_tokens, &model);
+                println!("Result message tokens - input: {}, output: {}", usage_info.input_tokens, usage_info.output_tokens);
+
+                // Record to historical cost tracking
+                let app_clone = app.clone();
+                let input = usage_info.input_tokens;
+                let output = usage_info.output_tokens;
+                tauri::async_runtime::spawn(async move {
+                    record_cost(&app_clone, input, output, cost_usd).await;
+                });
+            }
+
             // Always emit updated stats on result message (less frequent)
             // This includes the latest session duration
             let newly_unlocked = {
@@ -782,6 +853,7 @@ fn process_json_line(
                             content: text.clone(),
                             tool_name: None,
                             conversation_id: conversation_id.clone(),
+                            cost: None,
                         },
                     );
                 }

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "hikari-desktop",
-  "version": "0.3.0",
+  "version": "1.2.0",
   "identifier": "com.naomi.hikari-desktop",
   "build": {
     "beforeDevCommand": "pnpm dev",

src/lib/commands/slashCommands.test.ts

@@ -0,0 +1,414 @@
+import { describe, it, expect, vi } from "vitest";
+import {
+  slashCommands,
+  parseSlashCommand,
+  getMatchingCommands,
+  isSlashCommand,
+  type SlashCommand,
+} from "./slashCommands";
+
+// Mock all external dependencies
+vi.mock("svelte/store", () => ({
+  get: vi.fn(),
+}));
+
+vi.mock("@tauri-apps/api/core", () => ({
+  invoke: vi.fn(),
+}));
+
+vi.mock("$lib/stores/claude", () => ({
+  claudeStore: {
+    addLine: vi.fn(),
+    clearTerminal: vi.fn(),
+    activeConversationId: { subscribe: vi.fn() },
+    currentWorkingDirectory: { subscribe: vi.fn() },
+    setWorkingDirectory: vi.fn(),
+    getConversationHistory: vi.fn(),
+  },
+}));
+
+vi.mock("$lib/stores/character", () => ({
+  characterState: {
+    setState: vi.fn(),
+    setTemporaryState: vi.fn(),
+  },
+}));
+
+vi.mock("$lib/tauri", () => ({
+  setSkipNextGreeting: vi.fn(),
+}));
+
+vi.mock("$lib/stores/search", () => ({
+  searchState: {
+    setQuery: vi.fn(),
+    clear: vi.fn(),
+  },
+}));
+
+describe("slashCommands", () => {
+  describe("slashCommands array", () => {
+    it("contains expected commands", () => {
+      const commandNames = slashCommands.map((cmd) => cmd.name);
+      expect(commandNames).toContain("cd");
+      expect(commandNames).toContain("clear");
+      expect(commandNames).toContain("new");
+      expect(commandNames).toContain("help");
+      expect(commandNames).toContain("search");
+      expect(commandNames).toContain("summarise");
+      expect(commandNames).toContain("skill");
+    });
+
+    it("has 7 commands total", () => {
+      expect(slashCommands.length).toBe(7);
+    });
+
+    it("each command has required properties", () => {
+      slashCommands.forEach((cmd) => {
+        expect(cmd.name).toBeDefined();
+        expect(typeof cmd.name).toBe("string");
+        expect(cmd.name.length).toBeGreaterThan(0);
+
+        expect(cmd.description).toBeDefined();
+        expect(typeof cmd.description).toBe("string");
+        expect(cmd.description.length).toBeGreaterThan(0);
+
+        expect(cmd.usage).toBeDefined();
+        expect(typeof cmd.usage).toBe("string");
+        expect(cmd.usage.startsWith("/")).toBe(true);
+
+        expect(cmd.execute).toBeDefined();
+        expect(typeof cmd.execute).toBe("function");
+      });
+    });
+
+    it("cd command has correct metadata", () => {
+      const cdCmd = slashCommands.find((cmd) => cmd.name === "cd");
+      expect(cdCmd).toBeDefined();
+      expect(cdCmd!.description).toBe("Change the working directory");
+      expect(cdCmd!.usage).toBe("/cd <path>");
+    });
+
+    it("clear command has correct metadata", () => {
+      const clearCmd = slashCommands.find((cmd) => cmd.name === "clear");
+      expect(clearCmd).toBeDefined();
+      expect(clearCmd!.description).toBe("Clear the terminal display (keeps conversation context)");
+      expect(clearCmd!.usage).toBe("/clear");
+    });
+
+    it("new command has correct metadata", () => {
+      const newCmd = slashCommands.find((cmd) => cmd.name === "new");
+      expect(newCmd).toBeDefined();
+      expect(newCmd!.description).toBe("Start a fresh conversation (resets context)");
+      expect(newCmd!.usage).toBe("/new");
+    });
+
+    it("help command has correct metadata", () => {
+      const helpCmd = slashCommands.find((cmd) => cmd.name === "help");
+      expect(helpCmd).toBeDefined();
+      expect(helpCmd!.description).toBe("Show available slash commands");
+      expect(helpCmd!.usage).toBe("/help");
+    });
+
+    it("search command has correct metadata", () => {
+      const searchCmd = slashCommands.find((cmd) => cmd.name === "search");
+      expect(searchCmd).toBeDefined();
+      expect(searchCmd!.description).toBe("Search within the conversation (use /search to clear)");
+      expect(searchCmd!.usage).toBe("/search [query]");
+    });
+
+    it("summarise command has correct metadata", () => {
+      const summariseCmd = slashCommands.find((cmd) => cmd.name === "summarise");
+      expect(summariseCmd).toBeDefined();
+      expect(summariseCmd!.description).toBe("Get a summary of the entire conversation");
+      expect(summariseCmd!.usage).toBe("/summarise");
+    });
+
+    it("skill command has correct metadata", () => {
+      const skillCmd = slashCommands.find((cmd) => cmd.name === "skill");
+      expect(skillCmd).toBeDefined();
+      expect(skillCmd!.description).toBe("Invoke a Claude Code skill from ~/.claude/skills/");
+      expect(skillCmd!.usage).toBe("/skill [name] [data]");
+    });
+  });
+
+  describe("parseSlashCommand", () => {
+    it("returns null for non-slash input", () => {
+      const result = parseSlashCommand("hello world");
+      expect(result.command).toBeNull();
+      expect(result.args).toBe("");
+    });
+
+    it("returns null for empty string", () => {
+      const result = parseSlashCommand("");
+      expect(result.command).toBeNull();
+      expect(result.args).toBe("");
+    });
+
+    it("returns null for whitespace only", () => {
+      const result = parseSlashCommand("   ");
+      expect(result.command).toBeNull();
+      expect(result.args).toBe("");
+    });
+
+    it("parses /cd command without args", () => {
+      const result = parseSlashCommand("/cd");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("cd");
+      expect(result.args).toBe("");
+    });
+
+    it("parses /cd command with path argument", () => {
+      const result = parseSlashCommand("/cd /home/naomi/code");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("cd");
+      expect(result.args).toBe("/home/naomi/code");
+    });
+
+    it("parses /clear command", () => {
+      const result = parseSlashCommand("/clear");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("clear");
+      expect(result.args).toBe("");
+    });
+
+    it("parses /new command", () => {
+      const result = parseSlashCommand("/new");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("new");
+      expect(result.args).toBe("");
+    });
+
+    it("parses /help command", () => {
+      const result = parseSlashCommand("/help");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("help");
+      expect(result.args).toBe("");
+    });
+
+    it("parses /search command with query", () => {
+      const result = parseSlashCommand("/search hello world");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("search");
+      expect(result.args).toBe("hello world");
+    });
+
+    it("parses /search command without query", () => {
+      const result = parseSlashCommand("/search");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("search");
+      expect(result.args).toBe("");
+    });
+
+    it("parses /summarise command", () => {
+      const result = parseSlashCommand("/summarise");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("summarise");
+      expect(result.args).toBe("");
+    });
+
+    it("parses /skill command with name and data", () => {
+      const result = parseSlashCommand("/skill onboard-mentee john@example.com");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("skill");
+      expect(result.args).toBe("onboard-mentee john@example.com");
+    });
+
+    it("parses /skill command with name only", () => {
+      const result = parseSlashCommand("/skill onboard-mentee");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("skill");
+      expect(result.args).toBe("onboard-mentee");
+    });
+
+    it("parses /skill command without arguments", () => {
+      const result = parseSlashCommand("/skill");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("skill");
+      expect(result.args).toBe("");
+    });
+
+    it("returns null for unknown command", () => {
+      const result = parseSlashCommand("/unknown");
+      expect(result.command).toBeNull();
+      expect(result.args).toBe("");
+    });
+
+    it("is case insensitive for command names", () => {
+      const result1 = parseSlashCommand("/CD /path");
+      expect(result1.command).not.toBeNull();
+      expect(result1.command!.name).toBe("cd");
+
+      const result2 = parseSlashCommand("/CLEAR");
+      expect(result2.command).not.toBeNull();
+      expect(result2.command!.name).toBe("clear");
+
+      const result3 = parseSlashCommand("/Help");
+      expect(result3.command).not.toBeNull();
+      expect(result3.command!.name).toBe("help");
+    });
+
+    it("handles leading whitespace", () => {
+      const result = parseSlashCommand("  /cd /path");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("cd");
+      expect(result.args).toBe("/path");
+    });
+
+    it("handles trailing whitespace", () => {
+      const result = parseSlashCommand("/cd /path  ");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("cd");
+      expect(result.args).toBe("/path");
+    });
+
+    it("handles multiple spaces between args", () => {
+      const result = parseSlashCommand("/search   hello   world");
+      expect(result.command).not.toBeNull();
+      expect(result.command!.name).toBe("search");
+      expect(result.args).toBe("hello world");
+    });
+  });
+
+  describe("getMatchingCommands", () => {
+    it("returns empty array for non-slash input", () => {
+      const result = getMatchingCommands("hello");
+      expect(result).toEqual([]);
+    });
+
+    it("returns empty array for empty string", () => {
+      const result = getMatchingCommands("");
+      expect(result).toEqual([]);
+    });
+
+    it("returns all commands for just slash", () => {
+      const result = getMatchingCommands("/");
+      expect(result.length).toBe(slashCommands.length);
+    });
+
+    it("returns matching commands for partial input", () => {
+      const result = getMatchingCommands("/c");
+      const names = result.map((cmd) => cmd.name);
+      expect(names).toContain("cd");
+      expect(names).toContain("clear");
+      expect(names).not.toContain("help");
+    });
+
+    it("returns single command for exact match", () => {
+      const result = getMatchingCommands("/cd");
+      expect(result.length).toBe(1);
+      expect(result[0].name).toBe("cd");
+    });
+
+    it("returns single command for partial unique match", () => {
+      const result = getMatchingCommands("/cl");
+      expect(result.length).toBe(1);
+      expect(result[0].name).toBe("clear");
+    });
+
+    it("returns matching commands for /s prefix", () => {
+      const result = getMatchingCommands("/s");
+      const names = result.map((cmd) => cmd.name);
+      expect(names).toContain("search");
+      expect(names).toContain("summarise");
+      expect(names).toContain("skill");
+    });
+
+    it("is case insensitive", () => {
+      const result1 = getMatchingCommands("/C");
+      const result2 = getMatchingCommands("/c");
+      expect(result1.length).toBe(result2.length);
+    });
+
+    it("returns empty array for no matches", () => {
+      const result = getMatchingCommands("/xyz");
+      expect(result).toEqual([]);
+    });
+
+    it("handles whitespace correctly", () => {
+      const result = getMatchingCommands("  /c");
+      const names = result.map((cmd) => cmd.name);
+      expect(names).toContain("cd");
+      expect(names).toContain("clear");
+    });
+
+    it("returns command for full command name", () => {
+      const result = getMatchingCommands("/help");
+      expect(result.length).toBe(1);
+      expect(result[0].name).toBe("help");
+    });
+
+    it("returns command for /new", () => {
+      const result = getMatchingCommands("/n");
+      expect(result.length).toBe(1);
+      expect(result[0].name).toBe("new");
+    });
+  });
+
+  describe("isSlashCommand", () => {
+    it("returns true for input starting with slash", () => {
+      expect(isSlashCommand("/cd")).toBe(true);
+      expect(isSlashCommand("/")).toBe(true);
+      expect(isSlashCommand("/help")).toBe(true);
+      expect(isSlashCommand("/unknown")).toBe(true);
+    });
+
+    it("returns false for non-slash input", () => {
+      expect(isSlashCommand("hello")).toBe(false);
+      expect(isSlashCommand("")).toBe(false);
+      expect(isSlashCommand("cd")).toBe(false);
+    });
+
+    it("handles whitespace correctly", () => {
+      expect(isSlashCommand("  /cd")).toBe(true);
+      expect(isSlashCommand("  hello")).toBe(false);
+    });
+
+    it("returns false for slash in middle of string", () => {
+      expect(isSlashCommand("hello/world")).toBe(false);
+    });
+  });
+
+  describe("SlashCommand interface", () => {
+    it("can create a valid slash command object", () => {
+      const testCommand: SlashCommand = {
+        name: "test",
+        description: "A test command",
+        usage: "/test [arg]",
+        execute: vi.fn(),
+      };
+
+      expect(testCommand.name).toBe("test");
+      expect(testCommand.description).toBe("A test command");
+      expect(testCommand.usage).toBe("/test [arg]");
+      expect(typeof testCommand.execute).toBe("function");
+    });
+
+    it("execute can be async function", () => {
+      const asyncCommand: SlashCommand = {
+        name: "async",
+        description: "An async command",
+        usage: "/async",
+        execute: async () => {
+          await Promise.resolve();
+        },
+      };
+
+      expect(asyncCommand.execute("")).toBeInstanceOf(Promise);
+    });
+
+    it("execute can be sync function", () => {
+      const syncCommand: SlashCommand = {
+        name: "sync",
+        description: "A sync command",
+        usage: "/sync",
+        execute: () => {
+          // Synchronous execution
+        },
+      };
+
+      const result = syncCommand.execute("");
+      // Sync function returns undefined, not a Promise
+      expect(result).toBeUndefined();
+    });
+  });
+});

src/lib/components/AchievementNotification.svelte

@@ -161,7 +161,7 @@
 
         <!-- Celebration confetti effect (CSS only) -->
         <div class="absolute inset-0 pointer-events-none overflow-hidden rounded-lg">
-          {#each Array(10) as _ (_)}
+          {#each Array.from({ length: 10 }, (_, i) => i) as confettiIndex (confettiIndex)}
             <div
               class="absolute w-2 h-2 bg-gradient-to-br {getRarityColor(
                 getAchievementRarity(currentAchievement.achievement.id)

src/lib/components/ConfigSidebar.svelte

@@ -12,6 +12,7 @@
   } from "$lib/stores/config";
   import { claudeStore } from "$lib/stores/claude";
   import { getCurrentWindow } from "@tauri-apps/api/window";
+  import CostSummary from "./CostSummary.svelte";
 
   let config: HikariConfig = $state({
     model: null,
@@ -45,6 +46,11 @@
       text_secondary: null,
       border_color: null,
     },
+    budget_enabled: false,
+    session_token_budget: null,
+    session_cost_budget: null,
+    budget_action: "warn",
+    budget_warning_threshold: 0.8,
   });
 
   let showCustomThemeEditor = $state(false);
@@ -74,8 +80,17 @@
 
   const availableModels = [
     { value: "", label: "Default (from ~/.claude)" },
+    // Current generation (Claude 4.5)
+    { value: "claude-sonnet-4-5-20250929", label: "Claude Sonnet 4.5 (Recommended)" },
+    { value: "claude-haiku-4-5-20251001", label: "Claude Haiku 4.5 (Fast & Cheap)" },
+    { value: "claude-opus-4-5-20251101", label: "Claude Opus 4.5 (Most Capable)" },
+    // Previous generation (Claude 4)
+    { value: "claude-opus-4-1-20250805", label: "Claude Opus 4.1" },
     { value: "claude-sonnet-4-20250514", label: "Claude Sonnet 4" },
     { value: "claude-opus-4-20250514", label: "Claude Opus 4" },
+    // Legacy (Claude 3.x)
+    { value: "claude-3-7-sonnet-20250219", label: "Claude 3.7 Sonnet" },
+    { value: "claude-3-haiku-20240307", label: "Claude 3 Haiku (Cheapest)" },
   ];
 
   const commonTools = [
@@ -778,6 +793,135 @@
       {/if}
     </section>
 
+    <!-- Budget Settings Section -->
+    <section class="mb-6">
+      <h3 class="text-sm font-medium text-[var(--accent-primary)] uppercase tracking-wider mb-3">
+        Budget Settings
+      </h3>
+
+      <!-- Enable Budget Tracking -->
+      <div class="mb-4">
+        <label class="flex items-center gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            bind:checked={config.budget_enabled}
+            class="w-4 h-4 text-[var(--accent-primary)] bg-[var(--bg-primary)] border-[var(--border-color)] rounded focus:ring-[var(--accent-primary)] focus:ring-2"
+          />
+          <span class="text-sm text-[var(--text-primary)]">Enable budget tracking</span>
+        </label>
+        <p class="text-xs text-[var(--text-tertiary)] mt-1 ml-7">
+          Set limits on token usage and costs per session
+        </p>
+      </div>
+
+      {#if config.budget_enabled}
+        <!-- Token Budget -->
+        <div class="mb-4">
+          <label for="token-budget" class="block text-sm text-[var(--text-secondary)] mb-1">
+            Session Token Budget
+          </label>
+          <div class="flex items-center gap-2">
+            <input
+              id="token-budget"
+              type="number"
+              bind:value={config.session_token_budget}
+              min="0"
+              step="10000"
+              placeholder="e.g., 100000"
+              class="flex-1 px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-color)] rounded-lg text-[var(--text-primary)] text-sm focus:outline-none focus:border-[var(--accent-primary)]"
+            />
+            <span class="text-xs text-[var(--text-tertiary)]">tokens</span>
+          </div>
+          <p class="text-xs text-[var(--text-tertiary)] mt-1">Leave empty for unlimited tokens</p>
+        </div>
+
+        <!-- Cost Budget -->
+        <div class="mb-4">
+          <label for="cost-budget" class="block text-sm text-[var(--text-secondary)] mb-1">
+            Session Cost Budget
+          </label>
+          <div class="flex items-center gap-2">
+            <span class="text-sm text-[var(--text-secondary)]">$</span>
+            <input
+              id="cost-budget"
+              type="number"
+              bind:value={config.session_cost_budget}
+              min="0"
+              step="0.50"
+              placeholder="e.g., 5.00"
+              class="flex-1 px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-color)] rounded-lg text-[var(--text-primary)] text-sm focus:outline-none focus:border-[var(--accent-primary)]"
+            />
+            <span class="text-xs text-[var(--text-tertiary)]">USD</span>
+          </div>
+          <p class="text-xs text-[var(--text-tertiary)] mt-1">Leave empty for unlimited spending</p>
+        </div>
+
+        <!-- Warning Threshold -->
+        <div class="mb-4">
+          <label for="warning-threshold" class="block text-sm text-[var(--text-secondary)] mb-2">
+            Warning Threshold
+          </label>
+          <div class="flex items-center gap-3">
+            <input
+              id="warning-threshold"
+              type="range"
+              bind:value={config.budget_warning_threshold}
+              min="0.5"
+              max="0.95"
+              step="0.05"
+              class="flex-1 h-2 bg-[var(--bg-primary)] rounded-lg appearance-none cursor-pointer"
+            />
+            <span class="text-sm text-[var(--text-secondary)] w-12 text-right">
+              {Math.round(config.budget_warning_threshold * 100)}%
+            </span>
+          </div>
+          <p class="text-xs text-[var(--text-tertiary)] mt-1">
+            Show warning when this percentage of budget is used
+          </p>
+        </div>
+
+        <!-- Budget Action -->
+        <div class="mb-4">
+          <span class="block text-sm text-[var(--text-secondary)] mb-2"
+            >When budget is exceeded</span
+          >
+          <div class="flex gap-2" role="group" aria-label="Budget action">
+            <button
+              onclick={() => (config.budget_action = "warn")}
+              class="flex-1 px-3 py-2 rounded-lg border transition-colors text-sm {config.budget_action ===
+              'warn'
+                ? 'bg-[var(--accent-primary)] border-[var(--accent-primary)] text-white'
+                : 'bg-[var(--bg-primary)] border-[var(--border-color)] text-[var(--text-secondary)] hover:border-[var(--accent-primary)]'}"
+            >
+              Warn Only
+            </button>
+            <button
+              onclick={() => (config.budget_action = "block")}
+              class="flex-1 px-3 py-2 rounded-lg border transition-colors text-sm {config.budget_action ===
+              'block'
+                ? 'bg-[var(--accent-primary)] border-[var(--accent-primary)] text-white'
+                : 'bg-[var(--bg-primary)] border-[var(--border-color)] text-[var(--text-secondary)] hover:border-[var(--accent-primary)]'}"
+            >
+              Block Input
+            </button>
+          </div>
+          <p class="text-xs text-[var(--text-tertiary)] mt-2">
+            {config.budget_action === "warn"
+              ? "Show a warning but allow continued usage"
+              : "Prevent sending more messages until session is reset"}
+          </p>
+        </div>
+      {/if}
+    </section>
+
+    <!-- Cost History Section -->
+    <section class="mb-6">
+      <h3 class="text-sm font-medium text-[var(--accent-primary)] uppercase tracking-wider mb-3">
+        Cost History
+      </h3>
+      <CostSummary />
+    </section>
+
     <!-- Notifications Section -->
     <section class="mb-6">
       <h3 class="text-sm font-medium text-[var(--accent-primary)] uppercase tracking-wider mb-3">

src/lib/components/CostSummary.svelte

@@ -0,0 +1,402 @@
+<script lang="ts">
+  import {
+    costTrackingStore,
+    formattedCosts,
+    formatCost,
+    type CostSummary,
+    type CostAlertThresholds,
+  } from "$lib/stores/costTracking";
+
+  let selectedPeriod = $state<7 | 30 | 90>(7);
+  let summary = $state<CostSummary | null>(null);
+  let isLoading = $state(false);
+  let showThresholdSettings = $state(false);
+  let thresholds = $state<CostAlertThresholds>({
+    daily: null,
+    weekly: null,
+    monthly: null,
+  });
+
+  const costs = $derived($formattedCosts);
+
+  async function loadSummary() {
+    isLoading = true;
+    summary = await costTrackingStore.getSummary(selectedPeriod);
+    isLoading = false;
+  }
+
+  async function handleExport() {
+    const csv = await costTrackingStore.exportCsv(selectedPeriod);
+    if (csv) {
+      const blob = new Blob([csv], { type: "text/csv" });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement("a");
+      a.href = url;
+      a.download = `hikari-costs-${selectedPeriod}days.csv`;
+      a.click();
+      URL.revokeObjectURL(url);
+    }
+  }
+
+  async function handleSaveThresholds() {
+    await costTrackingStore.setAlertThresholds(thresholds);
+    showThresholdSettings = false;
+  }
+
+  $effect(() => {
+    loadSummary();
+  });
+</script>
+
+<div class="cost-summary">
+  <h3 class="summary-title">Cost Summary</h3>
+
+  <!-- Quick Stats -->
+  <div class="quick-stats">
+    <div class="stat-card">
+      <span class="stat-label">Today</span>
+      <span class="stat-value">{costs.today}</span>
+    </div>
+    <div class="stat-card">
+      <span class="stat-label">This Week</span>
+      <span class="stat-value">{costs.week}</span>
+    </div>
+    <div class="stat-card">
+      <span class="stat-label">This Month</span>
+      <span class="stat-value">{costs.month}</span>
+    </div>
+  </div>
+
+  <!-- Period Selector -->
+  <div class="period-selector">
+    <button
+      class="period-btn"
+      class:active={selectedPeriod === 7}
+      onclick={() => (selectedPeriod = 7)}
+    >
+      7 Days
+    </button>
+    <button
+      class="period-btn"
+      class:active={selectedPeriod === 30}
+      onclick={() => (selectedPeriod = 30)}
+    >
+      30 Days
+    </button>
+    <button
+      class="period-btn"
+      class:active={selectedPeriod === 90}
+      onclick={() => (selectedPeriod = 90)}
+    >
+      90 Days
+    </button>
+  </div>
+
+  <!-- Summary Details -->
+  {#if isLoading}
+    <div class="loading">Loading...</div>
+  {:else if summary}
+    <div class="summary-details">
+      <div class="detail-row">
+        <span class="detail-label">Total Cost</span>
+        <span class="detail-value highlight">{formatCost(summary.total_cost)}</span>
+      </div>
+      <div class="detail-row">
+        <span class="detail-label">Average Daily</span>
+        <span class="detail-value">{formatCost(summary.average_daily_cost)}</span>
+      </div>
+      <div class="detail-row">
+        <span class="detail-label">Messages</span>
+        <span class="detail-value">{summary.total_messages.toLocaleString()}</span>
+      </div>
+      <div class="detail-row">
+        <span class="detail-label">Sessions</span>
+        <span class="detail-value">{summary.total_sessions.toLocaleString()}</span>
+      </div>
+      <div class="detail-row">
+        <span class="detail-label">Input Tokens</span>
+        <span class="detail-value">{summary.total_input_tokens.toLocaleString()}</span>
+      </div>
+      <div class="detail-row">
+        <span class="detail-label">Output Tokens</span>
+        <span class="detail-value">{summary.total_output_tokens.toLocaleString()}</span>
+      </div>
+    </div>
+
+    <!-- Daily Breakdown (mini chart) -->
+    {#if summary.daily_breakdown.length > 0}
+      <div class="chart-section">
+        <h4 class="chart-title">Daily Spending</h4>
+        <div class="mini-chart">
+          {#each summary.daily_breakdown.slice(-14) as day (day.date)}
+            {@const maxCost = Math.max(...summary.daily_breakdown.map((d) => d.cost_usd), 0.01)}
+            {@const height = (day.cost_usd / maxCost) * 100}
+            <div class="chart-bar-container" title="{day.date}: {formatCost(day.cost_usd)}">
+              <div class="chart-bar" style="height: {height}%"></div>
+            </div>
+          {/each}
+        </div>
+      </div>
+    {/if}
+  {/if}
+
+  <!-- Actions -->
+  <div class="actions">
+    <button class="action-btn" onclick={handleExport}> Export CSV </button>
+    <button class="action-btn" onclick={() => (showThresholdSettings = !showThresholdSettings)}>
+      Set Alerts
+    </button>
+  </div>
+
+  <!-- Threshold Settings -->
+  {#if showThresholdSettings}
+    <div class="threshold-settings">
+      <h4>Cost Alert Thresholds</h4>
+      <div class="threshold-row">
+        <label for="daily-threshold">Daily</label>
+        <input
+          id="daily-threshold"
+          type="number"
+          step="0.01"
+          placeholder="e.g., 1.00"
+          bind:value={thresholds.daily}
+        />
+      </div>
+      <div class="threshold-row">
+        <label for="weekly-threshold">Weekly</label>
+        <input
+          id="weekly-threshold"
+          type="number"
+          step="0.01"
+          placeholder="e.g., 5.00"
+          bind:value={thresholds.weekly}
+        />
+      </div>
+      <div class="threshold-row">
+        <label for="monthly-threshold">Monthly</label>
+        <input
+          id="monthly-threshold"
+          type="number"
+          step="0.01"
+          placeholder="e.g., 20.00"
+          bind:value={thresholds.monthly}
+        />
+      </div>
+      <button class="save-btn" onclick={handleSaveThresholds}>Save Thresholds</button>
+    </div>
+  {/if}
+</div>
+
+<style>
+  .cost-summary {
+    padding: 1rem;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+  }
+
+  .summary-title {
+    margin: 0 0 1rem 0;
+    font-size: 1.1rem;
+    color: var(--text-primary);
+  }
+
+  .quick-stats {
+    display: grid;
+    grid-template-columns: repeat(3, 1fr);
+    gap: 0.5rem;
+    margin-bottom: 1rem;
+  }
+
+  .stat-card {
+    background: var(--bg-primary);
+    padding: 0.75rem;
+    border-radius: 6px;
+    text-align: center;
+  }
+
+  .stat-label {
+    display: block;
+    font-size: 0.75rem;
+    color: var(--text-secondary);
+    margin-bottom: 0.25rem;
+  }
+
+  .stat-value {
+    display: block;
+    font-size: 1.1rem;
+    font-weight: 600;
+    color: var(--accent-primary);
+  }
+
+  .period-selector {
+    display: flex;
+    gap: 0.5rem;
+    margin-bottom: 1rem;
+  }
+
+  .period-btn {
+    flex: 1;
+    padding: 0.5rem;
+    border: 1px solid var(--border-color);
+    background: var(--bg-primary);
+    color: var(--text-secondary);
+    border-radius: 4px;
+    cursor: pointer;
+    transition: all 0.2s;
+  }
+
+  .period-btn:hover {
+    border-color: var(--accent-primary);
+  }
+
+  .period-btn.active {
+    background: var(--accent-primary);
+    color: white;
+    border-color: var(--accent-primary);
+  }
+
+  .loading {
+    text-align: center;
+    padding: 1rem;
+    color: var(--text-secondary);
+  }
+
+  .summary-details {
+    background: var(--bg-primary);
+    padding: 0.75rem;
+    border-radius: 6px;
+    margin-bottom: 1rem;
+  }
+
+  .detail-row {
+    display: flex;
+    justify-content: space-between;
+    padding: 0.25rem 0;
+    border-bottom: 1px solid var(--border-color);
+  }
+
+  .detail-row:last-child {
+    border-bottom: none;
+  }
+
+  .detail-label {
+    color: var(--text-secondary);
+    font-size: 0.9rem;
+  }
+
+  .detail-value {
+    color: var(--text-primary);
+    font-weight: 500;
+  }
+
+  .detail-value.highlight {
+    color: var(--accent-primary);
+    font-size: 1.1rem;
+  }
+
+  .chart-section {
+    margin-bottom: 1rem;
+  }
+
+  .chart-title {
+    margin: 0 0 0.5rem 0;
+    font-size: 0.9rem;
+    color: var(--text-secondary);
+  }
+
+  .mini-chart {
+    display: flex;
+    align-items: flex-end;
+    gap: 2px;
+    height: 60px;
+    background: var(--bg-primary);
+    padding: 0.5rem;
+    border-radius: 4px;
+  }
+
+  .chart-bar-container {
+    flex: 1;
+    height: 100%;
+    display: flex;
+    align-items: flex-end;
+  }
+
+  .chart-bar {
+    width: 100%;
+    background: var(--accent-primary);
+    border-radius: 2px 2px 0 0;
+    min-height: 2px;
+    transition: height 0.3s;
+  }
+
+  .actions {
+    display: flex;
+    gap: 0.5rem;
+  }
+
+  .action-btn {
+    flex: 1;
+    padding: 0.5rem;
+    border: 1px solid var(--border-color);
+    background: var(--bg-primary);
+    color: var(--text-primary);
+    border-radius: 4px;
+    cursor: pointer;
+    transition: all 0.2s;
+  }
+
+  .action-btn:hover {
+    background: var(--bg-secondary);
+    border-color: var(--accent-primary);
+  }
+
+  .threshold-settings {
+    margin-top: 1rem;
+    padding: 1rem;
+    background: var(--bg-primary);
+    border-radius: 6px;
+  }
+
+  .threshold-settings h4 {
+    margin: 0 0 0.75rem 0;
+    font-size: 0.9rem;
+    color: var(--text-primary);
+  }
+
+  .threshold-row {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    margin-bottom: 0.5rem;
+  }
+
+  .threshold-row label {
+    width: 60px;
+    font-size: 0.85rem;
+    color: var(--text-secondary);
+  }
+
+  .threshold-row input {
+    flex: 1;
+    padding: 0.4rem;
+    border: 1px solid var(--border-color);
+    background: var(--bg-secondary);
+    color: var(--text-primary);
+    border-radius: 4px;
+  }
+
+  .save-btn {
+    width: 100%;
+    margin-top: 0.5rem;
+    padding: 0.5rem;
+    background: var(--accent-primary);
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+  }
+
+  .save-btn:hover {
+    opacity: 0.9;
+  }
+</style>

src/lib/components/InputBar.svelte

@@ -26,10 +26,12 @@
     type SlashCommand,
   } from "$lib/commands/slashCommands";
   import { configStore, isStreamerMode } from "$lib/stores/config";
+  import { stats, estimateMessageCost, formatTokenCount } from "$lib/stores/stats";
   import AttachmentPreview from "$lib/components/AttachmentPreview.svelte";
   import SnippetLibraryPanel from "$lib/components/SnippetLibraryPanel.svelte";
   import QuickActionsPanel from "$lib/components/QuickActionsPanel.svelte";
   import ClipboardHistoryPanel from "$lib/components/ClipboardHistoryPanel.svelte";
+  import TextInputContextMenu from "$lib/components/TextInputContextMenu.svelte";
   import type { Attachment } from "$lib/types/messages";
 
   const INPUT_HISTORY_KEY = "hikari-input-history";
@@ -49,6 +51,30 @@
   let showClipboardHistory = $state(false);
   let streamerModeActive = $state(false);
 
+  // Cost estimation for pre-submission display
+  let costEstimate = $derived(
+    inputValue.trim()
+      ? estimateMessageCost(inputValue, $stats.context_tokens_used, $stats.model)
+      : null
+  );
+
+  // Context menu state
+  let textareaElement: HTMLTextAreaElement | undefined = $state();
+  let contextMenuShow = $state(false);
+  let contextMenuX = $state(0);
+  let contextMenuY = $state(0);
+
+  function handleContextMenu(event: MouseEvent) {
+    event.preventDefault();
+    contextMenuShow = true;
+    contextMenuX = event.clientX;
+    contextMenuY = event.clientY;
+  }
+
+  function closeContextMenu() {
+    contextMenuShow = false;
+  }
+
   isStreamerMode.subscribe((value) => {
     streamerModeActive = value;
   });
@@ -876,10 +902,12 @@ User: ${formattedMessage}`;
       <!-- svelte-ignore a11y_no_static_element_interactions -->
       <div class="resize-handle" onmousedown={handleResizeStart} title="Drag to resize"></div>
       <textarea
+        bind:this={textareaElement}
         bind:value={inputValue}
         onkeydown={handleKeyDown}
         oninput={handleInputChange}
         onpaste={handlePaste}
+        oncontextmenu={handleContextMenu}
         placeholder={isConnected
           ? "Ask Hikari anything... (type / for commands)"
           : "Connect to Claude first..."}
@@ -893,6 +921,13 @@ User: ${formattedMessage}`;
     </div>
 
     <div class="button-wrapper">
+      {#if costEstimate && isConnected && !isProcessing}
+        <div class="cost-estimate" title="Estimated input cost for this message">
+          <span class="cost-tokens">+{formatTokenCount(costEstimate.messageTokens)}</span>
+          <span class="cost-value">${costEstimate.estimatedCost.toFixed(4)}</span>
+        </div>
+      {/if}
+
       <button type="button" onclick={handleFilePicker} class="attach-button" title="Attach files">
         <svg
           width="20"
@@ -958,6 +993,15 @@ User: ${formattedMessage}`;
   />
 {/if}
 
+{#if contextMenuShow && textareaElement}
+  <TextInputContextMenu
+    x={contextMenuX}
+    y={contextMenuY}
+    inputElement={textareaElement}
+    onClose={closeContextMenu}
+  />
+{/if}
+
 <style>
   .input-bar {
     display: flex;
@@ -1109,6 +1153,28 @@ User: ${formattedMessage}`;
     display: flex;
     align-items: flex-end;
     height: 100%;
+    gap: 8px;
+  }
+
+  .cost-estimate {
+    display: flex;
+    flex-direction: column;
+    align-items: flex-end;
+    justify-content: center;
+    padding: 0 8px;
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+    min-width: 60px;
+    height: 48px;
+  }
+
+  .cost-tokens {
+    opacity: 0.8;
+  }
+
+  .cost-value {
+    font-family: var(--font-mono, monospace);
+    color: var(--accent-primary);
   }
 
   .attach-button {

src/lib/components/KeyboardShortcutsModal.svelte

@@ -12,6 +12,7 @@
         { keys: ["Escape"], description: "Close modals and panels" },
         { keys: ["Ctrl", "L"], description: "Clear the terminal" },
         { keys: ["Ctrl", ","], description: "Open settings" },
+        { keys: ["Ctrl", "E"], description: "Toggle file editor" },
         { keys: ["Ctrl", "Shift", "M"], description: "Toggle compact mode" },
         { keys: ["Ctrl", "Shift", "S"], description: "Toggle streamer mode" },
       ],
@@ -26,6 +27,17 @@
         { keys: ["↓"], description: "Next input from history" },
       ],
     },
+    {
+      category: "File Editor",
+      items: [
+        { keys: ["Ctrl", "E"], description: "Toggle editor view" },
+        { keys: ["Ctrl", "B"], description: "Toggle file browser" },
+        { keys: ["Ctrl", "S"], description: "Save current file" },
+        { keys: ["Ctrl", "W"], description: "Close current tab" },
+        { keys: ["Ctrl", "N"], description: "New file" },
+        { keys: ["Right-click"], description: "Context menu (New/Delete)" },
+      ],
+    },
     {
       category: "Slash Commands",
       items: [

src/lib/components/StatsDisplay.svelte

@@ -1,8 +1,84 @@
 <script lang="ts">
-  import { formattedStats } from "$lib/stores/stats";
+  import {
+    formattedStats,
+    contextWarning,
+    getContextWarningMessage,
+    stats,
+    checkBudget,
+    getBudgetStatusMessage,
+    getRemainingTokenBudget,
+    getRemainingCostBudget,
+  } from "$lib/stores/stats";
+  import { configStore } from "$lib/stores/config";
+  import { costTrackingStore, formattedCosts } from "$lib/stores/costTracking";
   import { fade } from "svelte/transition";
+  import { onMount } from "svelte";
 
-  let showToolsBreakdown = false;
+  interface Props {
+    onRequestSummary?: () => void;
+    onStartFreshWithContext?: () => void;
+    isSummarising?: boolean;
+  }
+
+  let { onRequestSummary, onStartFreshWithContext, isSummarising = false }: Props = $props();
+
+  let showToolsBreakdown = $state(false);
+  let showHistoricalCosts = $state(false);
+  const historicalCosts = $derived($formattedCosts);
+
+  // Initialize cost tracking on mount
+  onMount(() => {
+    costTrackingStore.refresh();
+  });
+
+  // Subscribe to config store
+  const config = configStore.config;
+
+  const warning = $derived($contextWarning);
+
+  // Budget tracking - must be defined before showCompactionOptions
+  const budgetStatus = $derived(
+    checkBudget(
+      $stats,
+      $config.budget_enabled,
+      $config.session_token_budget,
+      $config.session_cost_budget,
+      $config.budget_warning_threshold
+    )
+  );
+  const budgetMessage = $derived(getBudgetStatusMessage(budgetStatus));
+
+  // Show compaction options when context or budget is at warning/critical levels
+  const showCompactionOptions = $derived(
+    warning === "high" ||
+      warning === "critical" ||
+      budgetStatus.type === "warning" ||
+      budgetStatus.type === "exceeded"
+  );
+
+  const remainingTokens = $derived(getRemainingTokenBudget($stats, $config.session_token_budget));
+  const remainingCost = $derived(getRemainingCostBudget($stats, $config.session_cost_budget));
+
+  // Calculate budget usage percentages for progress bars
+  const tokenBudgetPercent = $derived(() => {
+    const budget = $config.session_token_budget;
+    if (budget === null || budget === 0) return 0;
+    const used = $stats.session_input_tokens + $stats.session_output_tokens;
+    return Math.min(100, (used / budget) * 100);
+  });
+
+  const costBudgetPercent = $derived(() => {
+    const budget = $config.session_cost_budget;
+    if (budget === null || budget === 0) return 0;
+    return Math.min(100, ($stats.session_cost_usd / budget) * 100);
+  });
+
+  // Get the appropriate colour class for the progress bar
+  function getBudgetBarClass(percent: number, warningThreshold: number): string {
+    if (percent >= 100) return "budget-bar-exceeded";
+    if (percent >= warningThreshold * 100) return "budget-bar-warning";
+    return "budget-bar-ok";
+  }
 </script>
 
 <div class="stats-display" transition:fade={{ duration: 200 }}>
@@ -16,6 +92,120 @@
     <span class="stat-value">{$formattedStats.messagesSession}</span>
   </div>
 
+  <div class="stats-section">
+    <h3>Context Window</h3>
+    <div class="stat-row">
+      <span class="stat-label">Used:</span>
+      <span class="stat-value">{$formattedStats.contextUsed} / {$formattedStats.contextLimit}</span>
+    </div>
+    <div class="stat-row">
+      <span class="stat-label">Utilisation:</span>
+      <span class="stat-value context-util {warning ? `warning-${warning}` : ''}"
+        >{$formattedStats.contextUtilisation}</span
+      >
+    </div>
+    {#if warning}
+      <div class="context-warning warning-{warning}">
+        {getContextWarningMessage(warning)}
+      </div>
+    {/if}
+    {#if showCompactionOptions && (onRequestSummary || onStartFreshWithContext)}
+      <div class="compaction-actions">
+        {#if onRequestSummary}
+          <button
+            class="compaction-btn"
+            onclick={onRequestSummary}
+            disabled={isSummarising}
+            title="Compact conversation history to reduce context usage"
+          >
+            {#if isSummarising}
+              Compacting...
+            {:else}
+              Compact
+            {/if}
+          </button>
+        {/if}
+        {#if onStartFreshWithContext}
+          <button
+            class="compaction-btn compaction-btn-primary"
+            onclick={onStartFreshWithContext}
+            disabled={isSummarising}
+            title="Start a new conversation with context from this one"
+          >
+            Fresh Start
+          </button>
+        {/if}
+      </div>
+    {/if}
+  </div>
+
+  {#if $config.budget_enabled}
+    <div class="stats-section">
+      <h3>Budget</h3>
+      {#if $config.session_token_budget !== null}
+        <div class="budget-item">
+          <div class="stat-row">
+            <span class="stat-label">Tokens:</span>
+            <span
+              class="stat-value {budgetStatus.type !== 'ok' && budgetStatus.budget_type === 'token'
+                ? `budget-${budgetStatus.type}`
+                : ''}"
+            >
+              {($stats.session_input_tokens + $stats.session_output_tokens).toLocaleString()} / {$config.session_token_budget.toLocaleString()}
+            </span>
+          </div>
+          <div class="budget-bar-container">
+            <div
+              class="budget-bar {getBudgetBarClass(
+                tokenBudgetPercent(),
+                $config.budget_warning_threshold
+              )}"
+              style="width: {tokenBudgetPercent()}%"
+            ></div>
+          </div>
+          <div class="budget-remaining">
+            {remainingTokens?.toLocaleString() ?? 0} remaining ({(
+              100 - tokenBudgetPercent()
+            ).toFixed(1)}%)
+          </div>
+        </div>
+      {/if}
+      {#if $config.session_cost_budget !== null}
+        <div class="budget-item">
+          <div class="stat-row">
+            <span class="stat-label">Cost:</span>
+            <span
+              class="stat-value {budgetStatus.type !== 'ok' && budgetStatus.budget_type === 'cost'
+                ? `budget-${budgetStatus.type}`
+                : ''}"
+            >
+              ${$stats.session_cost_usd.toFixed(4)} / ${$config.session_cost_budget.toFixed(2)}
+            </span>
+          </div>
+          <div class="budget-bar-container">
+            <div
+              class="budget-bar {getBudgetBarClass(
+                costBudgetPercent(),
+                $config.budget_warning_threshold
+              )}"
+              style="width: {costBudgetPercent()}%"
+            ></div>
+          </div>
+          <div class="budget-remaining">
+            ${remainingCost?.toFixed(4) ?? "0.0000"} remaining ({(
+              100 - costBudgetPercent()
+            ).toFixed(1)}%)
+          </div>
+        </div>
+      {/if}
+      {#if budgetMessage}
+        <div class="budget-warning budget-{budgetStatus.type}">
+          {budgetMessage}
+        </div>
+      {/if}
+    </div>
+  {/if}
+
   <div class="stats-section">
     <h3>Tokens & Cost</h3>
     <div class="stat-row">
@@ -49,7 +239,7 @@
     </div>
   </div>
 
-  {#if Object.keys($formattedStats.sessionToolsUsage).length > 0}
+  {#if $formattedStats.sessionToolsFormatted.length > 0}
     <div class="stats-section">
       <h3 class="tools-header">
         <button class="tools-toggle" onclick={() => (showToolsBreakdown = !showToolsBreakdown)}>
@@ -59,17 +249,57 @@
       </h3>
       {#if showToolsBreakdown}
         <div class="tools-breakdown">
-          {#each Object.entries($formattedStats.sessionToolsUsage).sort((a, b) => b[1] - a[1]) as [tool, count] (tool)}
+          {#each $formattedStats.sessionToolsFormatted.sort((a, b) => b.totalTokens - a.totalTokens) as tool (tool.name)}
-            <div class="stat-row stat-detail">
+            <div class="stat-row stat-detail tool-row">
-              <span class="stat-label">{tool}:</span>
+              <span class="stat-label">{tool.name}:</span>
-              <span class="stat-value">{count}</span>
+              <span class="stat-value tool-stats">
+                <span class="tool-calls">{tool.callCount} calls</span>
+                {#if tool.totalTokens > 0}
+                  <span class="tool-tokens">(~{tool.formattedTokens})</span>
+                {/if}
+              </span>
             </div>
           {/each}
+          <div class="tools-note">* Token estimates based on attribution</div>
         </div>
       {/if}
     </div>
   {/if}
 
+  <!-- Historical Costs Section -->
+  <div class="stats-section">
+    <h3 class="costs-header">
+      <button class="costs-toggle" onclick={() => (showHistoricalCosts = !showHistoricalCosts)}>
+        Historical Costs
+        <span class="toggle-icon">{showHistoricalCosts ? "▼" : "▶"}</span>
+      </button>
+    </h3>
+    {#if !showHistoricalCosts}
+      <div class="costs-quick-stats">
+        <span class="cost-badge" title="Today's cost">Today: {historicalCosts.today}</span>
+        <span class="cost-badge" title="This week's cost">Week: {historicalCosts.week}</span>
+        <span class="cost-badge" title="This month's cost">Month: {historicalCosts.month}</span>
+      </div>
+    {/if}
+    {#if showHistoricalCosts}
+      <div class="historical-costs-expanded">
+        <div class="stat-row">
+          <span class="stat-label">Today:</span>
+          <span class="stat-value cost-value">{historicalCosts.today}</span>
+        </div>
+        <div class="stat-row">
+          <span class="stat-label">This Week:</span>
+          <span class="stat-value cost-value">{historicalCosts.week}</span>
+        </div>
+        <div class="stat-row">
+          <span class="stat-label">This Month:</span>
+          <span class="stat-value cost-value">{historicalCosts.month}</span>
+        </div>
+        <p class="costs-note">Open Settings to view detailed cost history and set alerts.</p>
+      </div>
+    {/if}
+  </div>
+
   <div class="model-info">
     <span class="model-label">Model:</span>
     <span class="model-value">{$formattedStats.model}</span>
@@ -128,6 +358,79 @@
     color: var(--text-primary, #e5e7eb);
   }
 
+  .stat-cost {
+    font-family: var(--font-mono, monospace);
+    color: var(--accent-primary, #10b981);
+    font-size: 0.8rem;
+    margin-left: 0.5rem;
+  }
+
+  .stats-row {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 0.125rem 0;
+  }
+
+  .tools-header {
+    margin: 0 !important;
+    padding: 0 !important;
+    border: none !important;
+  }
+
+  .tools-toggle {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    background: none;
+    border: none;
+    color: var(--text-primary);
+    font-size: 0.9rem;
+    font-weight: 600;
+    cursor: pointer;
+    padding: 0;
+  }
+
+  .tools-toggle:hover {
+    color: var(--accent-primary);
+  }
+
+  .toggle-icon {
+    font-size: 0.7rem;
+    opacity: 0.7;
+  }
+
+  .tools-breakdown {
+    margin-top: 0.25rem;
+  }
+
+  .tool-row {
+    flex-wrap: wrap;
+  }
+
+  .tool-stats {
+    display: flex;
+    gap: 0.5rem;
+    align-items: center;
+  }
+
+  .tool-calls {
+    color: var(--text-primary, #e5e7eb);
+  }
+
+  .tool-tokens {
+    color: var(--text-secondary, #9ca3af);
+    font-size: 0.75rem;
+  }
+
+  .tools-note {
+    margin-top: 0.5rem;
+    font-size: 0.65rem;
+    color: var(--text-secondary, #9ca3af);
+    font-style: italic;
+    opacity: 0.8;
+  }
+
   .model-info {
     display: flex;
     justify-content: space-between;
@@ -148,4 +451,220 @@
     color: var(--text-primary, #e5e7eb);
     font-size: 0.75rem;
   }
+
+  .context-util {
+    font-weight: 600;
+  }
+
+  .context-util.warning-moderate {
+    color: #f59e0b;
+  }
+
+  .context-util.warning-high {
+    color: #f97316;
+  }
+
+  .context-util.warning-critical {
+    color: #ef4444;
+  }
+
+  .context-warning {
+    margin-top: 0.5rem;
+    padding: 0.5rem;
+    border-radius: 4px;
+    font-size: 0.75rem;
+    line-height: 1.3;
+  }
+
+  .context-warning.warning-moderate {
+    background: rgba(245, 158, 11, 0.15);
+    border: 1px solid rgba(245, 158, 11, 0.3);
+    color: #fbbf24;
+  }
+
+  .context-warning.warning-high {
+    background: rgba(249, 115, 22, 0.15);
+    border: 1px solid rgba(249, 115, 22, 0.3);
+    color: #fb923c;
+  }
+
+  .context-warning.warning-critical {
+    background: rgba(239, 68, 68, 0.15);
+    border: 1px solid rgba(239, 68, 68, 0.3);
+    color: #f87171;
+  }
+
+  /* Budget progress bar styles */
+  .budget-item {
+    margin-bottom: 0.75rem;
+  }
+
+  .budget-item:last-child {
+    margin-bottom: 0;
+  }
+
+  .budget-bar-container {
+    width: 100%;
+    height: 6px;
+    background: var(--bg-primary);
+    border-radius: 3px;
+    margin-top: 0.25rem;
+    overflow: hidden;
+  }
+
+  .budget-bar {
+    height: 100%;
+    border-radius: 3px;
+    transition:
+      width 0.3s ease,
+      background-color 0.3s ease;
+  }
+
+  .budget-bar-ok {
+    background: linear-gradient(90deg, #10b981, #34d399);
+  }
+
+  .budget-bar-warning {
+    background: linear-gradient(90deg, #f59e0b, #fbbf24);
+  }
+
+  .budget-bar-exceeded {
+    background: linear-gradient(90deg, #ef4444, #f87171);
+  }
+
+  .budget-remaining {
+    font-size: 0.7rem;
+    color: var(--text-secondary);
+    margin-top: 0.125rem;
+    text-align: right;
+  }
+
+  /* Budget warning styles */
+  .budget-warning {
+    margin-top: 0.5rem;
+    padding: 0.5rem;
+    border-radius: 4px;
+    font-size: 0.75rem;
+    line-height: 1.3;
+  }
+
+  .budget-warning.budget-warning {
+    background: rgba(245, 158, 11, 0.15);
+    border: 1px solid rgba(245, 158, 11, 0.3);
+    color: #fbbf24;
+  }
+
+  .budget-warning.budget-exceeded {
+    background: rgba(239, 68, 68, 0.15);
+    border: 1px solid rgba(239, 68, 68, 0.3);
+    color: #f87171;
+  }
+
+  .stat-value.budget-warning {
+    color: #f59e0b;
+    font-weight: 600;
+  }
+
+  .stat-value.budget-exceeded {
+    color: #ef4444;
+    font-weight: 600;
+  }
+
+  /* Compaction action buttons */
+  .compaction-actions {
+    display: flex;
+    gap: 0.5rem;
+    margin-top: 0.5rem;
+  }
+
+  .compaction-btn {
+    flex: 1;
+    padding: 0.375rem 0.5rem;
+    font-size: 0.75rem;
+    font-weight: 500;
+    border-radius: 4px;
+    border: 1px solid var(--border-color);
+    background: var(--bg-primary);
+    color: var(--text-primary);
+    cursor: pointer;
+    transition: all 0.15s ease;
+  }
+
+  .compaction-btn:hover:not(:disabled) {
+    border-color: var(--accent-primary);
+    background: rgba(233, 69, 96, 0.1);
+  }
+
+  .compaction-btn:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+
+  .compaction-btn-primary {
+    background: var(--accent-primary);
+    border-color: var(--accent-primary);
+    color: white;
+  }
+
+  .compaction-btn-primary:hover:not(:disabled) {
+    background: var(--accent-secondary);
+    border-color: var(--accent-secondary);
+  }
+
+  /* Historical costs styles */
+  .costs-header {
+    margin: 0 !important;
+    padding: 0 !important;
+    border: none !important;
+  }
+
+  .costs-toggle {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    background: none;
+    border: none;
+    color: var(--text-primary);
+    font-size: 0.9rem;
+    font-weight: 600;
+    cursor: pointer;
+    padding: 0;
+  }
+
+  .costs-toggle:hover {
+    color: var(--accent-primary);
+  }
+
+  .costs-quick-stats {
+    display: flex;
+    gap: 0.5rem;
+    margin-top: 0.5rem;
+    flex-wrap: wrap;
+  }
+
+  .cost-badge {
+    font-size: 0.7rem;
+    padding: 0.2rem 0.4rem;
+    background: rgba(16, 185, 129, 0.1);
+    border: 1px solid rgba(16, 185, 129, 0.3);
+    border-radius: 3px;
+    color: #10b981;
+    font-family: var(--font-mono, monospace);
+  }
+
+  .historical-costs-expanded {
+    margin-top: 0.5rem;
+  }
+
+  .cost-value {
+    color: #10b981;
+  }
+
+  .costs-note {
+    margin: 0.5rem 0 0 0;
+    font-size: 0.65rem;
+    color: var(--text-secondary);
+    font-style: italic;
+    opacity: 0.8;
+  }
 </style>

src/lib/components/StatusBar.svelte

@@ -13,6 +13,7 @@
   import { get } from "svelte/store";
   import { claudeStore } from "$lib/stores/claude";
   import { configStore, type HikariConfig, isStreamerMode } from "$lib/stores/config";
+  import { editorStore } from "$lib/stores/editor";
   import type { ConnectionStatus } from "$lib/types/messages";
   import { onMount } from "svelte";
   import StatsDisplay from "./StatsDisplay.svelte";
@@ -23,6 +24,12 @@
   import SessionHistoryPanel from "./SessionHistoryPanel.svelte";
   import GitPanel from "./GitPanel.svelte";
   import ProfilePanel from "./ProfilePanel.svelte";
+  import { conversationsStore } from "$lib/stores/conversations";
+  import {
+    generateContextInjection,
+    createSummary,
+    sanitizeForJson,
+  } from "$lib/utils/conversationUtils";
 
   const DISCORD_URL = "https://chat.nhcarrigan.com";
   const DONATE_URL = "https://donate.nhcarrigan.com";
@@ -40,6 +47,7 @@
   let showSessionHistory = $state(false);
   let showGitPanel = $state(false);
   let showProfile = $state(false);
+  let isSummarising = $state(false);
   const progress = $derived($achievementProgress);
   let currentConfig: HikariConfig = $state({
     model: null,
@@ -73,6 +81,11 @@
       text_secondary: null,
       border_color: null,
     },
+    budget_enabled: false,
+    session_token_budget: null,
+    session_cost_budget: null,
+    budget_action: "warn",
+    budget_warning_threshold: 0.8,
   });
 
   let streamerModeActive = $state(false);
@@ -80,6 +93,15 @@
     streamerModeActive = value;
   });
 
+  let editorVisible = $state(false);
+  editorStore.isEditorVisible.subscribe((value) => {
+    editorVisible = value;
+  });
+
+  function toggleEditor() {
+    editorStore.toggleEditor();
+  }
+
   onMount(async () => {
     appVersion = await getVersion();
   });
@@ -190,6 +212,106 @@
   function toggleAchievements() {
     onToggleAchievements();
   }
+
+  async function handleCompactConversation() {
+    const activeId = get(conversationsStore.activeConversationId);
+    if (!activeId) return;
+
+    isSummarising = true;
+
+    try {
+      const conversationContent = conversationsStore.getConversationForSummary(activeId);
+      const messageCount =
+        get(conversationsStore.activeConversation)?.terminalLines.filter(
+          (l) => l.type === "user" || l.type === "assistant"
+        ).length || 0;
+      const tokenEstimate = conversationsStore.estimateTokenCount(activeId);
+
+      // Create a summary from the conversation content (truncate if too long)
+      // Apply sanitization early to handle any problematic escape sequences
+      const sanitizedContent = sanitizeForJson(conversationContent);
+      const summaryContent =
+        sanitizedContent.length > 4000
+          ? `${sanitizedContent.slice(0, 4000)}\n\n[Truncated for length - original had ${messageCount} messages]`
+          : sanitizedContent;
+
+      // Step 1: Disconnect from Claude to reset context
+      if (connectionStatus === "connected") {
+        await invoke("stop_claude", { conversationId: activeId });
+      }
+
+      // Step 2: Clear messages and store summary
+      conversationsStore.compactWithSummary(activeId, summaryContent, messageCount, tokenEstimate);
+
+      // Step 3: Reconnect to Claude with fresh context
+      const allAllowedTools = [
+        ...(currentConfig.auto_granted_tools || []),
+        ...Array.from(get(claudeStore.grantedTools)),
+      ];
+
+      await invoke("start_claude", {
+        conversationId: activeId,
+        options: {
+          working_dir: workingDirectory || selectedDirectory,
+          model: currentConfig.model || null,
+          api_key: currentConfig.api_key || null,
+          custom_instructions: currentConfig.custom_instructions || null,
+          mcp_servers_json: currentConfig.mcp_servers_json || null,
+          allowed_tools: allAllowedTools,
+        },
+      });
+
+      // Step 4: Send the context summary to Claude as the first message
+      const contextPrompt = generateContextInjection(
+        createSummary(summaryContent, messageCount, tokenEstimate)
+      );
+
+      await invoke("send_prompt", {
+        conversationId: activeId,
+        message: contextPrompt,
+      });
+
+      claudeStore.addLine(
+        "system",
+        "Conversation compacted. Context from previous session has been provided to Claude."
+      );
+    } catch (error) {
+      console.error("Failed to compact conversation:", error);
+      claudeStore.addLine("error", `Failed to compact conversation: ${error}`);
+    } finally {
+      isSummarising = false;
+    }
+  }
+
+  async function handleStartFreshWithContext() {
+    const activeId = get(conversationsStore.activeConversationId);
+    if (!activeId) return;
+
+    const conversationContent = conversationsStore.getConversationForSummary(activeId);
+    const messageCount =
+      get(conversationsStore.activeConversation)?.terminalLines.filter(
+        (l) => l.type === "user" || l.type === "assistant"
+      ).length || 0;
+    const tokenEstimate = conversationsStore.estimateTokenCount(activeId);
+
+    const summary = createSummary(
+      `This is a continuation of a previous conversation. Here's what was discussed:\n\n${conversationContent.slice(0, 4000)}${conversationContent.length > 4000 ? "\n\n[Truncated for length...]" : ""}`,
+      messageCount,
+      tokenEstimate
+    );
+
+    const newConvId = conversationsStore.createConversation("Fresh Start");
+
+    conversationsStore.setSummary(newConvId, summary);
+
+    // Context injection is generated but the actual injection happens via the summary
+    generateContextInjection(summary);
+    claudeStore.addLine("system", "Started fresh conversation with context from previous session.");
+    claudeStore.addLine(
+      "system",
+      `Previous session had ${messageCount} messages (~${tokenEstimate.toLocaleString()} tokens).`
+    );
+  }
 </script>
 
 <div
@@ -307,6 +429,25 @@
         />
       </svg>
     </button>
+    <button
+      onclick={toggleEditor}
+      disabled={connectionStatus !== "connected"}
+      class="p-1 text-gray-500 icon-trans-hover {editorVisible
+        ? 'text-[var(--trans-pink)]'
+        : ''} disabled:opacity-40 disabled:cursor-not-allowed"
+      title={connectionStatus === "connected"
+        ? "File Editor (Ctrl+E)"
+        : "Connect to enable file editor"}
+    >
+      <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"
+        />
+      </svg>
+    </button>
     <button
       onclick={() => (showStats = !showStats)}
       class="p-1 text-gray-500 icon-trans-hover {showStats ? 'text-[var(--trans-pink)]' : ''}"
@@ -417,7 +558,11 @@
 
     {#if showStats}
       <div class="absolute top-full right-0 mt-2 mr-4 z-50">
-        <StatsDisplay />
+        <StatsDisplay
+          onRequestSummary={handleCompactConversation}
+          onStartFreshWithContext={handleStartFreshWithContext}
+          {isSummarising}
+        />
       </div>
     {/if}
     {#if connectionStatus === "connected"}
@@ -444,7 +589,11 @@
   <!-- svelte-ignore a11y_no_static_element_interactions -->
   <div class="fixed inset-0 z-40" onclick={() => (showStats = false)}></div>
   <div class="fixed top-14 right-4 z-50">
-    <StatsDisplay />
+    <StatsDisplay
+      onRequestSummary={handleCompactConversation}
+      onStartFreshWithContext={handleStartFreshWithContext}
+      {isSummarising}
+    />
   </div>
 {/if}
 

src/lib/components/Terminal.svelte

@@ -155,6 +155,30 @@
       terminalElement.removeEventListener("copy", handleCopy);
     }
   });
+
+  // Copy message content to clipboard
+  async function copyMessage(content: string) {
+    try {
+      await navigator.clipboard.writeText(content);
+      // Optionally capture to clipboard history
+      await clipboardStore.captureClipboard(content, null, "Message from chat");
+
+      // Visual feedback could be added here if needed
+    } catch (error) {
+      console.error("Failed to copy message:", error);
+    }
+  }
+
+  // State for showing "Copied!" feedback
+  let copiedMessageId: string | null = null;
+
+  async function handleCopyMessage(messageId: string, content: string) {
+    await copyMessage(content);
+    copiedMessageId = messageId;
+    setTimeout(() => {
+      copiedMessageId = null;
+    }, 2000);
+  }
 </script>
 
 <div
@@ -185,19 +209,51 @@
       </div>
     {:else}
       {#each lines as line (line.id)}
-        <div class="terminal-line mb-2 {getLineClass(line.type)}">
+        <div class="terminal-line mb-2 {getLineClass(line.type)} relative group">
           <span class="terminal-timestamp text-xs mr-2">{formatTime(line.timestamp)}</span>
+          {#if line.cost && line.cost.costUsd > 0}
+            <span
+              class="terminal-cost text-xs mr-2"
+              title="Input: {line.cost.inputTokens} | Output: {line.cost.outputTokens}"
+            >
+              ${line.cost.costUsd < 0.01
+                ? line.cost.costUsd.toFixed(4)
+                : line.cost.costUsd.toFixed(3)}
+            </span>
+          {/if}
           {#if getLinePrefix(line.type)}
             <span class="terminal-prefix mr-2">{getLinePrefix(line.type)}</span>
           {/if}
           {#if line.toolName}
             <span class="terminal-tool-name mr-2">[{line.toolName}]</span>
           {/if}
-          {#if line.type === "assistant"}
+          {#if line.type === "assistant" || line.type === "user"}
-            <Markdown
+            <div class="message-content-wrapper">
-              content={maskPaths(line.content, hidePaths)}
+              <Markdown
-              searchQuery={currentSearchQuery}
+                content={maskPaths(line.content, hidePaths)}
-            />
+                searchQuery={currentSearchQuery}
+              />
+              <button
+                class="copy-message-btn opacity-0 group-hover:opacity-100 transition-opacity"
+                onclick={() => handleCopyMessage(line.id, line.content)}
+                title="Copy message"
+              >
+                <svg
+                  width="14"
+                  height="14"
+                  viewBox="0 0 24 24"
+                  fill="none"
+                  stroke="currentColor"
+                  stroke-width="2"
+                  stroke-linecap="round"
+                  stroke-linejoin="round"
+                >
+                  <rect x="9" y="9" width="13" height="13" rx="2" ry="2"></rect>
+                  <path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"></path>
+                </svg>
+                <span class="copy-text">{copiedMessageId === line.id ? "Copied!" : "Copy"}</span>
+              </button>
+            </div>
           {:else}
             <HighlightedText
               content={maskPaths(line.content, hidePaths)}
@@ -245,6 +301,14 @@
     color: var(--text-tertiary, #6b7280);
   }
 
+  .terminal-cost {
+    color: var(--terminal-cost, #10b981);
+    background: var(--terminal-cost-bg, rgba(16, 185, 129, 0.1));
+    padding: 0 4px;
+    border-radius: 3px;
+    font-family: monospace;
+  }
+
   .terminal-prefix {
     color: var(--text-secondary);
   }
@@ -267,4 +331,45 @@
     border-radius: 2px;
     padding: 0 2px;
   }
+
+  /* Message content wrapper for positioning */
+  .message-content-wrapper {
+    position: relative;
+    display: inline-block;
+    width: 100%;
+  }
+
+  /* Copy button styling */
+  .copy-message-btn {
+    position: absolute;
+    top: 0;
+    right: 0;
+    display: flex;
+    align-items: center;
+    gap: 0.4em;
+    background: var(--bg-secondary);
+    border: 1px solid var(--border-color);
+    color: var(--text-secondary);
+    padding: 0.25em 0.5em;
+    cursor: pointer;
+    border-radius: 4px;
+    font-size: 0.85em;
+    font-family: inherit;
+    transition: all 0.15s ease;
+  }
+
+  .copy-message-btn:hover {
+    background: var(--bg-hover);
+    color: var(--text-primary);
+    border-color: var(--border-hover, var(--border-color));
+  }
+
+  .copy-message-btn svg {
+    flex-shrink: 0;
+  }
+
+  /* Ensure relative positioning for parent */
+  .terminal-line {
+    position: relative;
+  }
 </style>

src/lib/components/TextInputContextMenu.svelte

@@ -0,0 +1,228 @@
+<script lang="ts">
+  interface Props {
+    x: number;
+    y: number;
+    inputElement: HTMLTextAreaElement | HTMLInputElement;
+    onClose: () => void;
+  }
+
+  let { x, y, inputElement, onClose }: Props = $props();
+
+  // Menu element reference for measuring
+  let menuElement: HTMLDivElement | undefined = $state();
+
+  // Adjusted position to keep menu within viewport
+  let adjustedX = $derived.by(() => {
+    if (!menuElement) return x;
+    const menuWidth = menuElement.offsetWidth || 180;
+    const maxX = window.innerWidth - menuWidth - 8;
+    return Math.min(x, maxX);
+  });
+
+  let adjustedY = $derived.by(() => {
+    if (!menuElement) return y;
+    const menuHeight = menuElement.offsetHeight || 250;
+    const maxY = window.innerHeight - menuHeight - 8;
+    return Math.min(y, maxY);
+  });
+
+  function handleKeydown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      onClose();
+    }
+  }
+
+  function execCommand(command: "cut" | "copy" | "paste" | "selectAll" | "undo" | "redo") {
+    inputElement.focus();
+
+    switch (command) {
+      case "cut":
+        document.execCommand("cut");
+        break;
+      case "copy":
+        document.execCommand("copy");
+        break;
+      case "paste":
+        document.execCommand("paste");
+        break;
+      case "selectAll":
+        inputElement.select();
+        break;
+      case "undo":
+        document.execCommand("undo");
+        break;
+      case "redo":
+        document.execCommand("redo");
+        break;
+    }
+    onClose();
+  }
+
+  // Check if there's a selection
+  let hasSelection = $derived(inputElement.selectionStart !== inputElement.selectionEnd);
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions a11y_click_events_have_key_events -->
+<div
+  class="menu-overlay"
+  onclick={onClose}
+  oncontextmenu={(e) => {
+    e.preventDefault();
+    onClose();
+  }}
+>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    bind:this={menuElement}
+    class="menu-content"
+    style="left: {adjustedX}px; top: {adjustedY}px;"
+    onclick={(e) => e.stopPropagation()}
+  >
+    <button class="menu-item" onclick={() => execCommand("undo")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M3 10h10a5 5 0 0 1 5 5v2M3 10l4-4M3 10l4 4"
+        />
+      </svg>
+      Undo
+      <span class="shortcut">Ctrl+Z</span>
+    </button>
+
+    <button class="menu-item" onclick={() => execCommand("redo")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M21 10H11a5 5 0 0 0-5 5v2M21 10l-4-4M21 10l-4 4"
+        />
+      </svg>
+      Redo
+      <span class="shortcut">Ctrl+Y</span>
+    </button>
+
+    <div class="menu-divider"></div>
+
+    <button class="menu-item" onclick={() => execCommand("cut")} disabled={!hasSelection}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M14.121 14.121L19 19m-7-7l7-7m-7 7l-2.879 2.879M12 12L9.121 9.121m0 5.758a3 3 0 1 0-4.243-4.243 3 3 0 0 0 4.243 4.243zm0-5.758a3 3 0 1 0-4.243-4.243 3 3 0 0 0 4.243 4.243z"
+        />
+      </svg>
+      Cut
+      <span class="shortcut">Ctrl+X</span>
+    </button>
+
+    <button class="menu-item" onclick={() => execCommand("copy")} disabled={!hasSelection}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M8 16H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h8a2 2 0 0 1 2 2v2m-6 12h8a2 2 0 0 0 2-2v-8a2 2 0 0 0-2-2h-8a2 2 0 0 0-2 2v8a2 2 0 0 0 2 2z"
+        />
+      </svg>
+      Copy
+      <span class="shortcut">Ctrl+C</span>
+    </button>
+
+    <button class="menu-item" onclick={() => execCommand("paste")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M9 5H7a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V7a2 2 0 0 0-2-2h-2M9 5a2 2 0 0 0 2 2h2a2 2 0 0 0 2-2M9 5a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2"
+        />
+      </svg>
+      Paste
+      <span class="shortcut">Ctrl+V</span>
+    </button>
+
+    <div class="menu-divider"></div>
+
+    <button class="menu-item" onclick={() => execCommand("selectAll")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M4 5a1 1 0 0 1 1-1h14a1 1 0 0 1 1 1v14a1 1 0 0 1-1 1H5a1 1 0 0 1-1-1V5z"
+        />
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 9h6v6H9z" />
+      </svg>
+      Select All
+      <span class="shortcut">Ctrl+A</span>
+    </button>
+  </div>
+</div>
+
+<style>
+  .menu-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 50;
+  }
+
+  .menu-content {
+    position: absolute;
+    z-index: 50;
+    min-width: 180px;
+    border-radius: 0.375rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-secondary);
+    padding: 0.25rem 0;
+    box-shadow:
+      0 10px 15px -3px rgba(0, 0, 0, 0.1),
+      0 4px 6px -2px rgba(0, 0, 0, 0.05);
+  }
+
+  .menu-item {
+    display: flex;
+    width: 100%;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.375rem 0.75rem;
+    text-align: left;
+    font-size: 0.875rem;
+    color: var(--text-primary);
+    background: transparent;
+    border: none;
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .menu-item:hover:not(:disabled) {
+    background-color: var(--bg-primary);
+  }
+
+  .menu-item:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+
+  .menu-divider {
+    margin: 0.25rem 0;
+    border-top: 1px solid var(--border-color);
+  }
+
+  .menu-icon {
+    width: 1rem;
+    height: 1rem;
+    flex-shrink: 0;
+  }
+
+  .shortcut {
+    margin-left: auto;
+    font-size: 0.75rem;
+    color: var(--text-secondary);
+  }
+</style>

src/lib/components/editor/CodeEditor.svelte

@@ -0,0 +1,482 @@
+<script lang="ts">
+  import { onMount, onDestroy } from "svelte";
+  import { EditorView, basicSetup } from "codemirror";
+  import { EditorState, Compartment } from "@codemirror/state";
+  import { keymap } from "@codemirror/view";
+  import { oneDark } from "@codemirror/theme-one-dark";
+  import { javascript } from "@codemirror/lang-javascript";
+  import { python } from "@codemirror/lang-python";
+  import { rust } from "@codemirror/lang-rust";
+  import { html } from "@codemirror/lang-html";
+  import { css } from "@codemirror/lang-css";
+  import { json } from "@codemirror/lang-json";
+  import { markdown } from "@codemirror/lang-markdown";
+  import { xml } from "@codemirror/lang-xml";
+  import { sql } from "@codemirror/lang-sql";
+  import { java } from "@codemirror/lang-java";
+  import { cpp } from "@codemirror/lang-cpp";
+  import { php } from "@codemirror/lang-php";
+  import { go } from "@codemirror/lang-go";
+  import { yaml } from "@codemirror/lang-yaml";
+  import { sass } from "@codemirror/lang-sass";
+  import { less } from "@codemirror/lang-less";
+  import { vue } from "@codemirror/lang-vue";
+  import { angular } from "@codemirror/lang-angular";
+  import { wast } from "@codemirror/lang-wast";
+  import { StreamLanguage } from "@codemirror/language";
+  import { shell } from "@codemirror/legacy-modes/mode/shell";
+  import { ruby } from "@codemirror/legacy-modes/mode/ruby";
+  import { swift } from "@codemirror/legacy-modes/mode/swift";
+  import { lua } from "@codemirror/legacy-modes/mode/lua";
+  import { r } from "@codemirror/legacy-modes/mode/r";
+  import { toml } from "@codemirror/legacy-modes/mode/toml";
+  import { dockerFile } from "@codemirror/legacy-modes/mode/dockerfile";
+  import { powerShell } from "@codemirror/legacy-modes/mode/powershell";
+  import { HighlightStyle, syntaxHighlighting } from "@codemirror/language";
+  import { tags } from "@lezer/highlight";
+  import { editorStore } from "$lib/stores/editor";
+  import { configStore } from "$lib/stores/config";
+  import EditorContextMenu from "./EditorContextMenu.svelte";
+  import type { EditorTab } from "$lib/types/editor";
+  import type { Extension } from "@codemirror/state";
+
+  export let tab: EditorTab;
+
+  let editorContainer: HTMLDivElement;
+  let view: EditorView | null = null;
+  let themeCompartment = new Compartment();
+
+  // Context menu state
+  let contextMenuShow = false;
+  let contextMenuX = 0;
+  let contextMenuY = 0;
+
+  function handleContextMenu(event: MouseEvent) {
+    event.preventDefault();
+    contextMenuShow = true;
+    contextMenuX = event.clientX;
+    contextMenuY = event.clientY;
+  }
+
+  function closeContextMenu() {
+    contextMenuShow = false;
+  }
+
+  // Subscribe to theme changes
+  const config = configStore.config;
+
+  // Light theme
+  const lightTheme = EditorView.theme(
+    {
+      "&": {
+        backgroundColor: "#ffffff",
+        color: "#24292e",
+      },
+      ".cm-content": {
+        caretColor: "#24292e",
+      },
+      ".cm-cursor, .cm-dropCursor": {
+        borderLeftColor: "#24292e",
+      },
+      "&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection": {
+        backgroundColor: "#c8d3f5",
+      },
+      ".cm-panels": {
+        backgroundColor: "#f6f8fa",
+        color: "#24292e",
+      },
+      ".cm-panels.cm-panels-top": {
+        borderBottom: "1px solid #e1e4e8",
+      },
+      ".cm-panels.cm-panels-bottom": {
+        borderTop: "1px solid #e1e4e8",
+      },
+      ".cm-searchMatch": {
+        backgroundColor: "#ffdf5d",
+        outline: "1px solid #c4a000",
+      },
+      ".cm-searchMatch.cm-searchMatch-selected": {
+        backgroundColor: "#c4a000",
+      },
+      ".cm-activeLine": {
+        backgroundColor: "#f6f8fa",
+      },
+      ".cm-selectionMatch": {
+        backgroundColor: "#c8d3f5",
+      },
+      ".cm-matchingBracket, .cm-nonmatchingBracket": {
+        backgroundColor: "#c8d3f5",
+        outline: "1px solid #888",
+      },
+      ".cm-gutters": {
+        backgroundColor: "#f6f8fa",
+        color: "#6a737d",
+        border: "none",
+        borderRight: "1px solid #e1e4e8",
+      },
+      ".cm-activeLineGutter": {
+        backgroundColor: "#e1e4e8",
+      },
+      ".cm-foldPlaceholder": {
+        backgroundColor: "transparent",
+        border: "none",
+        color: "#6a737d",
+      },
+      ".cm-tooltip": {
+        border: "1px solid #e1e4e8",
+        backgroundColor: "#ffffff",
+      },
+      ".cm-tooltip .cm-tooltip-arrow:before": {
+        borderTopColor: "transparent",
+        borderBottomColor: "transparent",
+      },
+      ".cm-tooltip .cm-tooltip-arrow:after": {
+        borderTopColor: "#ffffff",
+        borderBottomColor: "#ffffff",
+      },
+      ".cm-tooltip-autocomplete": {
+        "& > ul > li[aria-selected]": {
+          backgroundColor: "#e1e4e8",
+          color: "#24292e",
+        },
+      },
+    },
+    { dark: false }
+  );
+
+  const lightHighlightStyle = HighlightStyle.define([
+    { tag: tags.keyword, color: "#d73a49" },
+    {
+      tag: [tags.name, tags.deleted, tags.character, tags.propertyName, tags.macroName],
+      color: "#6f42c1",
+    },
+    { tag: [tags.function(tags.variableName), tags.labelName], color: "#6f42c1" },
+    { tag: [tags.color, tags.constant(tags.name), tags.standard(tags.name)], color: "#005cc5" },
+    { tag: [tags.definition(tags.name), tags.separator], color: "#24292e" },
+    {
+      tag: [
+        tags.typeName,
+        tags.className,
+        tags.number,
+        tags.changed,
+        tags.annotation,
+        tags.modifier,
+        tags.self,
+        tags.namespace,
+      ],
+      color: "#e36209",
+    },
+    {
+      tag: [
+        tags.operator,
+        tags.operatorKeyword,
+        tags.url,
+        tags.escape,
+        tags.regexp,
+        tags.link,
+        tags.special(tags.string),
+      ],
+      color: "#032f62",
+    },
+    { tag: [tags.meta, tags.comment], color: "#6a737d" },
+    { tag: tags.strong, fontWeight: "bold" },
+    { tag: tags.emphasis, fontStyle: "italic" },
+    { tag: tags.strikethrough, textDecoration: "line-through" },
+    { tag: tags.link, color: "#032f62", textDecoration: "underline" },
+    { tag: tags.heading, fontWeight: "bold", color: "#005cc5" },
+    { tag: [tags.atom, tags.bool, tags.special(tags.variableName)], color: "#005cc5" },
+    { tag: [tags.processingInstruction, tags.string, tags.inserted], color: "#22863a" },
+    { tag: tags.invalid, color: "#cb2431" },
+  ]);
+
+  // High contrast theme
+  const highContrastTheme = EditorView.theme(
+    {
+      "&": {
+        backgroundColor: "#000000",
+        color: "#ffffff",
+      },
+      ".cm-content": {
+        caretColor: "#ffffff",
+      },
+      ".cm-cursor, .cm-dropCursor": {
+        borderLeftColor: "#ffffff",
+        borderLeftWidth: "2px",
+      },
+      "&.cm-focused .cm-selectionBackground, .cm-selectionBackground, .cm-content ::selection": {
+        backgroundColor: "#264f78",
+      },
+      ".cm-panels": {
+        backgroundColor: "#000000",
+        color: "#ffffff",
+      },
+      ".cm-panels.cm-panels-top": {
+        borderBottom: "2px solid #ffffff",
+      },
+      ".cm-panels.cm-panels-bottom": {
+        borderTop: "2px solid #ffffff",
+      },
+      ".cm-searchMatch": {
+        backgroundColor: "#515c6a",
+        outline: "2px solid #ffff00",
+      },
+      ".cm-searchMatch.cm-searchMatch-selected": {
+        backgroundColor: "#ffff00",
+        color: "#000000",
+      },
+      ".cm-activeLine": {
+        backgroundColor: "#1a1a1a",
+      },
+      ".cm-selectionMatch": {
+        backgroundColor: "#264f78",
+      },
+      ".cm-matchingBracket, .cm-nonmatchingBracket": {
+        backgroundColor: "#515c6a",
+        outline: "2px solid #ffff00",
+      },
+      ".cm-gutters": {
+        backgroundColor: "#000000",
+        color: "#858585",
+        border: "none",
+        borderRight: "2px solid #ffffff",
+      },
+      ".cm-activeLineGutter": {
+        backgroundColor: "#1a1a1a",
+        color: "#ffffff",
+      },
+      ".cm-foldPlaceholder": {
+        backgroundColor: "transparent",
+        border: "none",
+        color: "#ffff00",
+      },
+      ".cm-tooltip": {
+        border: "2px solid #ffffff",
+        backgroundColor: "#000000",
+      },
+      ".cm-tooltip .cm-tooltip-arrow:before": {
+        borderTopColor: "transparent",
+        borderBottomColor: "transparent",
+      },
+      ".cm-tooltip .cm-tooltip-arrow:after": {
+        borderTopColor: "#000000",
+        borderBottomColor: "#000000",
+      },
+      ".cm-tooltip-autocomplete": {
+        "& > ul > li[aria-selected]": {
+          backgroundColor: "#264f78",
+          color: "#ffffff",
+        },
+      },
+    },
+    { dark: true }
+  );
+
+  const highContrastHighlightStyle = HighlightStyle.define([
+    { tag: tags.keyword, color: "#569cd6", fontWeight: "bold" },
+    {
+      tag: [tags.name, tags.deleted, tags.character, tags.propertyName, tags.macroName],
+      color: "#9cdcfe",
+    },
+    { tag: [tags.function(tags.variableName), tags.labelName], color: "#dcdcaa" },
+    { tag: [tags.color, tags.constant(tags.name), tags.standard(tags.name)], color: "#4fc1ff" },
+    { tag: [tags.definition(tags.name), tags.separator], color: "#ffffff" },
+    {
+      tag: [
+        tags.typeName,
+        tags.className,
+        tags.number,
+        tags.changed,
+        tags.annotation,
+        tags.modifier,
+        tags.self,
+        tags.namespace,
+      ],
+      color: "#4ec9b0",
+    },
+    {
+      tag: [
+        tags.operator,
+        tags.operatorKeyword,
+        tags.url,
+        tags.escape,
+        tags.regexp,
+        tags.link,
+        tags.special(tags.string),
+      ],
+      color: "#d4d4d4",
+    },
+    { tag: [tags.meta, tags.comment], color: "#6a9955" },
+    { tag: tags.strong, fontWeight: "bold" },
+    { tag: tags.emphasis, fontStyle: "italic" },
+    { tag: tags.strikethrough, textDecoration: "line-through" },
+    { tag: tags.link, color: "#3794ff", textDecoration: "underline" },
+    { tag: tags.heading, fontWeight: "bold", color: "#569cd6" },
+    { tag: [tags.atom, tags.bool, tags.special(tags.variableName)], color: "#569cd6" },
+    { tag: [tags.processingInstruction, tags.string, tags.inserted], color: "#ce9178" },
+    { tag: tags.invalid, color: "#f44747" },
+  ]);
+
+  function getThemeExtension(theme: string): Extension {
+    switch (theme) {
+      case "light":
+        return [lightTheme, syntaxHighlighting(lightHighlightStyle)];
+      case "high-contrast":
+        return [highContrastTheme, syntaxHighlighting(highContrastHighlightStyle)];
+      case "dark":
+      case "custom":
+      default:
+        return oneDark;
+    }
+  }
+
+  function getLanguageExtension(language: string): Extension {
+    const languageMap: Record<string, () => Extension> = {
+      javascript: () => javascript({ jsx: true, typescript: false }),
+      typescript: () => javascript({ jsx: true, typescript: true }),
+      python: () => python(),
+      rust: () => rust(),
+      html: () => html(),
+      css: () => css(),
+      json: () => json(),
+      markdown: () => markdown(),
+      xml: () => xml(),
+      sql: () => sql(),
+      java: () => java(),
+      c: () => cpp(),
+      cpp: () => cpp(),
+      csharp: () => cpp(),
+      php: () => php(),
+      go: () => go(),
+      yaml: () => yaml(),
+      scss: () => sass(),
+      sass: () => sass(),
+      less: () => less(),
+      vue: () => vue(),
+      angular: () => angular(),
+      wasm: () => wast(),
+      shell: () => StreamLanguage.define(shell),
+      ruby: () => StreamLanguage.define(ruby),
+      swift: () => StreamLanguage.define(swift),
+      lua: () => StreamLanguage.define(lua),
+      r: () => StreamLanguage.define(r),
+      toml: () => StreamLanguage.define(toml),
+      dockerfile: () => StreamLanguage.define(dockerFile),
+      powershell: () => StreamLanguage.define(powerShell),
+      svelte: () => html(),
+    };
+
+    const getExtension = languageMap[language];
+    return getExtension ? getExtension() : [];
+  }
+
+  function createEditor() {
+    if (!editorContainer) return;
+
+    const currentTheme = $config.theme;
+
+    const saveKeymap = keymap.of([
+      {
+        key: "Mod-s",
+        run: () => {
+          editorStore.saveFile(tab.id);
+          return true;
+        },
+      },
+    ]);
+
+    const updateListener = EditorView.updateListener.of((update) => {
+      if (update.docChanged) {
+        const content = update.state.doc.toString();
+        editorStore.updateTabContent(tab.id, content);
+      }
+    });
+
+    const state = EditorState.create({
+      doc: tab.content,
+      extensions: [
+        basicSetup,
+        themeCompartment.of(getThemeExtension(currentTheme)),
+        getLanguageExtension(tab.language),
+        saveKeymap,
+        updateListener,
+        EditorView.theme({
+          "&": {
+            height: "100%",
+            fontSize: "14px",
+          },
+          ".cm-scroller": {
+            overflow: "auto",
+          },
+          ".cm-content": {
+            fontFamily: "'JetBrains Mono', 'Fira Code', 'Consolas', monospace",
+          },
+        }),
+      ],
+    });
+
+    view = new EditorView({
+      state,
+      parent: editorContainer,
+    });
+  }
+
+  function destroyEditor() {
+    if (view) {
+      view.destroy();
+      view = null;
+    }
+  }
+
+  // Watch for theme changes and update the editor
+  $: if (view && $config.theme) {
+    view.dispatch({
+      effects: themeCompartment.reconfigure(getThemeExtension($config.theme)),
+    });
+  }
+
+  onMount(() => {
+    createEditor();
+  });
+
+  onDestroy(() => {
+    destroyEditor();
+  });
+
+  $: if (view && tab.content !== view.state.doc.toString()) {
+    view.dispatch({
+      changes: {
+        from: 0,
+        to: view.state.doc.length,
+        insert: tab.content,
+      },
+    });
+  }
+</script>
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="code-editor" bind:this={editorContainer} oncontextmenu={handleContextMenu}></div>
+
+{#if contextMenuShow && view}
+  <EditorContextMenu
+    x={contextMenuX}
+    y={contextMenuY}
+    editorView={view}
+    onClose={closeContextMenu}
+  />
+{/if}
+
+<style>
+  .code-editor {
+    flex: 1;
+    overflow: hidden;
+    background-color: var(--bg-terminal);
+  }
+
+  .code-editor :global(.cm-editor) {
+    height: 100%;
+  }
+
+  .code-editor :global(.cm-focused) {
+    outline: none;
+  }
+</style>

src/lib/components/editor/ConfirmDialog.svelte

@@ -0,0 +1,131 @@
+<script lang="ts">
+  interface Props {
+    title: string;
+    message: string;
+    confirmText?: string;
+    cancelText?: string;
+    destructive?: boolean;
+    onConfirm: () => void;
+    onCancel: () => void;
+  }
+
+  let {
+    title,
+    message,
+    confirmText = "Confirm",
+    cancelText = "Cancel",
+    destructive = false,
+    onConfirm,
+    onCancel,
+  }: Props = $props();
+
+  function handleKeydown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      onCancel();
+    } else if (event.key === "Enter") {
+      onConfirm();
+    }
+  }
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="dialog-overlay" onclick={onCancel}>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div class="dialog-content" onclick={(e) => e.stopPropagation()}>
+    <h2 class="dialog-title">{title}</h2>
+    <p class="dialog-message">{message}</p>
+
+    <div class="dialog-actions">
+      <button class="btn-cancel" onclick={onCancel}>
+        {cancelText}
+      </button>
+      <button class="btn-confirm" class:destructive onclick={onConfirm}>
+        {confirmText}
+      </button>
+    </div>
+  </div>
+</div>
+
+<style>
+  .dialog-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 50;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background-color: rgba(0, 0, 0, 0.5);
+  }
+
+  .dialog-content {
+    margin: 0 1rem;
+    width: 100%;
+    max-width: 28rem;
+    border-radius: 0.5rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-secondary);
+    padding: 1.5rem;
+    box-shadow:
+      0 20px 25px -5px rgba(0, 0, 0, 0.1),
+      0 10px 10px -5px rgba(0, 0, 0, 0.04);
+  }
+
+  .dialog-title {
+    margin-bottom: 0.5rem;
+    font-size: 1.125rem;
+    font-weight: 600;
+    color: var(--text-primary);
+  }
+
+  .dialog-message {
+    margin-bottom: 1.5rem;
+    font-size: 0.875rem;
+    color: var(--text-secondary);
+  }
+
+  .dialog-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 0.75rem;
+  }
+
+  .btn-cancel {
+    border-radius: 0.375rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-primary);
+    padding: 0.5rem 1rem;
+    font-size: 0.875rem;
+    color: var(--text-primary);
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .btn-cancel:hover {
+    background-color: var(--bg-secondary);
+  }
+
+  .btn-confirm {
+    border-radius: 0.375rem;
+    border: none;
+    background-color: var(--accent-primary);
+    padding: 0.5rem 1rem;
+    font-size: 0.875rem;
+    color: white;
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .btn-confirm:hover {
+    background-color: var(--accent-secondary);
+  }
+
+  .btn-confirm.destructive {
+    background-color: #dc2626;
+  }
+
+  .btn-confirm.destructive:hover {
+    background-color: #b91c1c;
+  }
+</style>

src/lib/components/editor/EditorContextMenu.svelte

@@ -0,0 +1,238 @@
+<script lang="ts">
+  import type { EditorView } from "@codemirror/view";
+
+  interface Props {
+    x: number;
+    y: number;
+    editorView: EditorView;
+    onClose: () => void;
+  }
+
+  let { x, y, editorView, onClose }: Props = $props();
+
+  // Menu element reference for measuring
+  let menuElement: HTMLDivElement | undefined = $state();
+
+  // Adjusted position to keep menu within viewport
+  let adjustedX = $derived.by(() => {
+    if (!menuElement) return x;
+    const menuWidth = menuElement.offsetWidth || 180;
+    const maxX = window.innerWidth - menuWidth - 8;
+    return Math.min(x, maxX);
+  });
+
+  let adjustedY = $derived.by(() => {
+    if (!menuElement) return y;
+    const menuHeight = menuElement.offsetHeight || 250;
+    const maxY = window.innerHeight - menuHeight - 8;
+    return Math.min(y, maxY);
+  });
+
+  function handleKeydown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      onClose();
+    }
+  }
+
+  function execCommand(command: "cut" | "copy" | "paste" | "selectAll" | "undo" | "redo") {
+    editorView.focus();
+
+    switch (command) {
+      case "cut":
+        document.execCommand("cut");
+        break;
+      case "copy":
+        document.execCommand("copy");
+        break;
+      case "paste":
+        document.execCommand("paste");
+        break;
+      case "selectAll":
+        editorView.dispatch({
+          selection: { anchor: 0, head: editorView.state.doc.length },
+        });
+        break;
+      case "undo":
+        import("@codemirror/commands").then(({ undo }) => {
+          undo(editorView);
+        });
+        break;
+      case "redo":
+        import("@codemirror/commands").then(({ redo }) => {
+          redo(editorView);
+        });
+        break;
+    }
+    onClose();
+  }
+
+  // Check if there's a selection
+  let hasSelection = $derived(
+    editorView.state.selection.main.from !== editorView.state.selection.main.to
+  );
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions a11y_click_events_have_key_events -->
+<div
+  class="menu-overlay"
+  onclick={onClose}
+  oncontextmenu={(e) => {
+    e.preventDefault();
+    onClose();
+  }}
+>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    bind:this={menuElement}
+    class="menu-content"
+    style="left: {adjustedX}px; top: {adjustedY}px;"
+    onclick={(e) => e.stopPropagation()}
+  >
+    <button class="menu-item" onclick={() => execCommand("undo")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M3 10h10a5 5 0 0 1 5 5v2M3 10l4-4M3 10l4 4"
+        />
+      </svg>
+      Undo
+      <span class="shortcut">Ctrl+Z</span>
+    </button>
+
+    <button class="menu-item" onclick={() => execCommand("redo")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M21 10H11a5 5 0 0 0-5 5v2M21 10l-4-4M21 10l-4 4"
+        />
+      </svg>
+      Redo
+      <span class="shortcut">Ctrl+Y</span>
+    </button>
+
+    <div class="menu-divider"></div>
+
+    <button class="menu-item" onclick={() => execCommand("cut")} disabled={!hasSelection}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M14.121 14.121L19 19m-7-7l7-7m-7 7l-2.879 2.879M12 12L9.121 9.121m0 5.758a3 3 0 1 0-4.243-4.243 3 3 0 0 0 4.243 4.243zm0-5.758a3 3 0 1 0-4.243-4.243 3 3 0 0 0 4.243 4.243z"
+        />
+      </svg>
+      Cut
+      <span class="shortcut">Ctrl+X</span>
+    </button>
+
+    <button class="menu-item" onclick={() => execCommand("copy")} disabled={!hasSelection}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M8 16H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h8a2 2 0 0 1 2 2v2m-6 12h8a2 2 0 0 0 2-2v-8a2 2 0 0 0-2-2h-8a2 2 0 0 0-2 2v8a2 2 0 0 0 2 2z"
+        />
+      </svg>
+      Copy
+      <span class="shortcut">Ctrl+C</span>
+    </button>
+
+    <button class="menu-item" onclick={() => execCommand("paste")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M9 5H7a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h10a2 2 0 0 0 2-2V7a2 2 0 0 0-2-2h-2M9 5a2 2 0 0 0 2 2h2a2 2 0 0 0 2-2M9 5a2 2 0 0 1 2-2h2a2 2 0 0 1 2 2"
+        />
+      </svg>
+      Paste
+      <span class="shortcut">Ctrl+V</span>
+    </button>
+
+    <div class="menu-divider"></div>
+
+    <button class="menu-item" onclick={() => execCommand("selectAll")}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M4 5a1 1 0 0 1 1-1h14a1 1 0 0 1 1 1v14a1 1 0 0 1-1 1H5a1 1 0 0 1-1-1V5z"
+        />
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 9h6v6H9z" />
+      </svg>
+      Select All
+      <span class="shortcut">Ctrl+A</span>
+    </button>
+  </div>
+</div>
+
+<style>
+  .menu-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 50;
+  }
+
+  .menu-content {
+    position: absolute;
+    z-index: 50;
+    min-width: 180px;
+    border-radius: 0.375rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-secondary);
+    padding: 0.25rem 0;
+    box-shadow:
+      0 10px 15px -3px rgba(0, 0, 0, 0.1),
+      0 4px 6px -2px rgba(0, 0, 0, 0.05);
+  }
+
+  .menu-item {
+    display: flex;
+    width: 100%;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.375rem 0.75rem;
+    text-align: left;
+    font-size: 0.875rem;
+    color: var(--text-primary);
+    background: transparent;
+    border: none;
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .menu-item:hover:not(:disabled) {
+    background-color: var(--bg-primary);
+  }
+
+  .menu-item:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+
+  .menu-divider {
+    margin: 0.25rem 0;
+    border-top: 1px solid var(--border-color);
+  }
+
+  .menu-icon {
+    width: 1rem;
+    height: 1rem;
+    flex-shrink: 0;
+  }
+
+  .shortcut {
+    margin-left: auto;
+    font-size: 0.75rem;
+    color: var(--text-secondary);
+  }
+</style>

src/lib/components/editor/EditorPanel.svelte

@@ -0,0 +1,253 @@
+<script lang="ts">
+  import { editorStore } from "$lib/stores/editor";
+  import FileBrowser from "./FileBrowser.svelte";
+  import EditorTabs from "./EditorTabs.svelte";
+  import CodeEditor from "./CodeEditor.svelte";
+
+  const isFileBrowserOpen = editorStore.isFileBrowserOpen;
+  const activeTab = editorStore.activeTab;
+  const saveError = editorStore.saveError;
+
+  function toggleFileBrowser() {
+    editorStore.toggleFileBrowser();
+  }
+
+  async function handleSave() {
+    try {
+      await editorStore.saveFile();
+    } catch {
+      // Error is already set in the store
+    }
+  }
+</script>
+
+<div class="editor-panel">
+  <div class="toolbar">
+    <button
+      class="toolbar-button"
+      class:active={$isFileBrowserOpen}
+      on:click={toggleFileBrowser}
+      title="Toggle file browser (Ctrl+B)"
+    >
+      <svg
+        width="16"
+        height="16"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2"
+      >
+        <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
+      </svg>
+    </button>
+
+    <div class="toolbar-spacer"></div>
+
+    {#if $activeTab}
+      <button class="toolbar-button" on:click={handleSave} title="Save (Ctrl+S)">
+        <svg
+          width="16"
+          height="16"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z" />
+          <polyline points="17 21 17 13 7 13 7 21" />
+          <polyline points="7 3 7 8 15 8" />
+        </svg>
+      </button>
+    {/if}
+  </div>
+
+  {#if $saveError}
+    <div class="error-banner">
+      <span>{$saveError}</span>
+      <button
+        class="dismiss-button"
+        on:click={() => {}}
+        title="Dismiss error"
+        aria-label="Dismiss error"
+      >
+        <svg
+          width="14"
+          height="14"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <path d="M18 6L6 18M6 6l12 12" />
+        </svg>
+      </button>
+    </div>
+  {/if}
+
+  <div class="editor-content">
+    {#if $isFileBrowserOpen}
+      <div class="file-browser-container">
+        <FileBrowser />
+      </div>
+    {/if}
+
+    <div class="editor-main">
+      <EditorTabs />
+
+      <div class="editor-area">
+        {#if $activeTab}
+          {#key $activeTab.id}
+            <CodeEditor tab={$activeTab} />
+          {/key}
+        {:else}
+          <div class="no-file">
+            <div class="no-file-content">
+              <svg
+                width="48"
+                height="48"
+                viewBox="0 0 24 24"
+                fill="none"
+                stroke="currentColor"
+                stroke-width="1"
+              >
+                <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+                <polyline points="14 2 14 8 20 8" />
+              </svg>
+              <p>Select a file to edit</p>
+              <p class="hint">Use the file browser on the left or press Ctrl+B to toggle it</p>
+            </div>
+          </div>
+        {/if}
+      </div>
+    </div>
+  </div>
+</div>
+
+<style>
+  .editor-panel {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    background-color: var(--bg-primary);
+  }
+
+  .toolbar {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    padding: 4px 8px;
+    background-color: var(--bg-secondary);
+    border-bottom: 1px solid var(--border-color);
+  }
+
+  .toolbar-button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 6px;
+    background: transparent;
+    border: none;
+    color: var(--text-secondary);
+    cursor: pointer;
+    border-radius: 4px;
+    transition: all 0.15s ease;
+  }
+
+  .toolbar-button:hover {
+    background-color: var(--bg-primary);
+    color: var(--text-primary);
+  }
+
+  .toolbar-button.active {
+    background-color: var(--bg-primary);
+    color: var(--accent-primary);
+  }
+
+  .toolbar-spacer {
+    flex: 1;
+  }
+
+  .error-banner {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 8px 12px;
+    background-color: #ff000022;
+    border-bottom: 1px solid #ff0000;
+    color: #ff6b6b;
+    font-size: 13px;
+  }
+
+  .dismiss-button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 4px;
+    background: transparent;
+    border: none;
+    color: #ff6b6b;
+    cursor: pointer;
+    border-radius: 4px;
+  }
+
+  .dismiss-button:hover {
+    background-color: #ff000033;
+  }
+
+  .editor-content {
+    display: flex;
+    flex: 1;
+    overflow: hidden;
+  }
+
+  .file-browser-container {
+    width: 250px;
+    min-width: 150px;
+    max-width: 400px;
+    flex-shrink: 0;
+    overflow: hidden;
+  }
+
+  .editor-main {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+  }
+
+  .editor-area {
+    flex: 1;
+    overflow: hidden;
+    display: flex;
+  }
+
+  .no-file {
+    flex: 1;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background-color: var(--bg-terminal);
+  }
+
+  .no-file-content {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 12px;
+    color: var(--text-secondary);
+    text-align: center;
+  }
+
+  .no-file-content svg {
+    opacity: 0.5;
+  }
+
+  .no-file-content p {
+    margin: 0;
+  }
+
+  .no-file-content .hint {
+    font-size: 12px;
+    opacity: 0.7;
+  }
+</style>

src/lib/components/editor/EditorTabs.svelte

@@ -0,0 +1,170 @@
+<script lang="ts">
+  import { editorStore } from "$lib/stores/editor";
+
+  const tabs = editorStore.tabs;
+  const activeTabId = editorStore.activeTabId;
+
+  function handleTabClick(tabId: string) {
+    editorStore.setActiveTab(tabId);
+  }
+
+  function handleCloseTab(event: MouseEvent, tabId: string) {
+    event.stopPropagation();
+    editorStore.closeTab(tabId);
+  }
+
+  function handleKeydown(event: KeyboardEvent, tabId: string) {
+    if (event.key === "Enter" || event.key === " ") {
+      event.preventDefault();
+      editorStore.setActiveTab(tabId);
+    }
+  }
+
+  function handleCloseKeydown(event: KeyboardEvent, tabId: string) {
+    if (event.key === "Enter" || event.key === " ") {
+      event.preventDefault();
+      event.stopPropagation();
+      editorStore.closeTab(tabId);
+    }
+  }
+</script>
+
+<div class="editor-tabs">
+  {#if $tabs.length === 0}
+    <div class="no-tabs">No files open</div>
+  {:else}
+    <div class="tabs-container" role="tablist">
+      {#each $tabs as tab (tab.id)}
+        <div
+          class="tab"
+          class:active={tab.id === $activeTabId}
+          class:dirty={tab.isDirty}
+          role="tab"
+          tabindex="0"
+          aria-selected={tab.id === $activeTabId}
+          on:click={() => handleTabClick(tab.id)}
+          on:keydown={(e) => handleKeydown(e, tab.id)}
+          title={tab.filePath}
+        >
+          <span class="tab-name">
+            {tab.fileName}
+            {#if tab.isDirty}
+              <span class="dirty-indicator">*</span>
+            {/if}
+          </span>
+          <button
+            class="close-button"
+            on:click={(e) => handleCloseTab(e, tab.id)}
+            on:keydown={(e) => handleCloseKeydown(e, tab.id)}
+            title="Close tab"
+            aria-label="Close {tab.fileName}"
+          >
+            <svg
+              width="12"
+              height="12"
+              viewBox="0 0 24 24"
+              fill="none"
+              stroke="currentColor"
+              stroke-width="2"
+            >
+              <path d="M18 6L6 18M6 6l12 12" />
+            </svg>
+          </button>
+        </div>
+      {/each}
+    </div>
+  {/if}
+</div>
+
+<style>
+  .editor-tabs {
+    display: flex;
+    align-items: center;
+    background-color: var(--bg-secondary);
+    border-bottom: 1px solid var(--border-color);
+    min-height: 36px;
+  }
+
+  .no-tabs {
+    padding: 8px 12px;
+    color: var(--text-secondary);
+    font-size: 13px;
+  }
+
+  .tabs-container {
+    display: flex;
+    overflow-x: auto;
+    scrollbar-width: thin;
+  }
+
+  .tab {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 8px 12px;
+    background: transparent;
+    border: none;
+    border-right: 1px solid var(--border-color);
+    color: var(--text-secondary);
+    font-size: 13px;
+    cursor: pointer;
+    white-space: nowrap;
+    transition: all 0.15s ease;
+  }
+
+  .tab:hover {
+    background-color: var(--bg-primary);
+    color: var(--text-primary);
+  }
+
+  .tab:focus {
+    outline: 1px solid var(--accent-primary);
+    outline-offset: -1px;
+  }
+
+  .tab.active {
+    background-color: var(--bg-terminal);
+    color: var(--text-primary);
+    border-bottom: 2px solid var(--accent-primary);
+    margin-bottom: -1px;
+  }
+
+  .tab-name {
+    display: flex;
+    align-items: center;
+    gap: 2px;
+  }
+
+  .dirty-indicator {
+    color: var(--accent-primary);
+    font-weight: bold;
+  }
+
+  .close-button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 2px;
+    background: transparent;
+    border: none;
+    color: var(--text-secondary);
+    cursor: pointer;
+    border-radius: 4px;
+    opacity: 0;
+    transition: all 0.15s ease;
+  }
+
+  .tab:hover .close-button,
+  .tab.active .close-button {
+    opacity: 1;
+  }
+
+  .close-button:hover {
+    background-color: var(--bg-secondary);
+    color: var(--text-primary);
+  }
+
+  .tab.dirty .close-button {
+    opacity: 1;
+  }
+</style>

src/lib/components/editor/FileBrowser.svelte

@@ -0,0 +1,358 @@
+<script lang="ts">
+  import { onMount, onDestroy } from "svelte";
+  import { editorStore } from "$lib/stores/editor";
+  import FileTreeItem from "./FileTreeItem.svelte";
+  import FileContextMenu from "./FileContextMenu.svelte";
+  import InputDialog from "./InputDialog.svelte";
+  import ConfirmDialog from "./ConfirmDialog.svelte";
+  import type { FileEntry } from "$lib/types/editor";
+
+  const fileTree = editorStore.fileTree;
+  const isLoadingTree = editorStore.isLoadingTree;
+  const currentDirectory = editorStore.currentDirectory;
+
+  // Listen for Ctrl+N keyboard shortcut from +page.svelte
+  function handleNewFileEvent() {
+    handleNewFile();
+  }
+
+  onMount(() => {
+    window.addEventListener("editor-new-file", handleNewFileEvent);
+  });
+
+  onDestroy(() => {
+    window.removeEventListener("editor-new-file", handleNewFileEvent);
+  });
+
+  // Context menu state
+  let contextMenu = $state<{
+    show: boolean;
+    x: number;
+    y: number;
+    targetEntry: FileEntry | null;
+  }>({
+    show: false,
+    x: 0,
+    y: 0,
+    targetEntry: null,
+  });
+
+  // Dialog state
+  let dialog = $state<{
+    type: "newFile" | "newFolder" | "delete" | "rename" | null;
+    parentPath: string;
+    targetEntry: FileEntry | null;
+  }>({
+    type: null,
+    parentPath: "",
+    targetEntry: null,
+  });
+
+  function handleRefresh() {
+    const dir = $currentDirectory;
+    if (dir) {
+      editorStore.initializeFileTree(dir);
+    }
+  }
+
+  function handleContextMenu(event: MouseEvent, entry: FileEntry | null = null) {
+    event.preventDefault();
+    contextMenu = {
+      show: true,
+      x: event.clientX,
+      y: event.clientY,
+      targetEntry: entry,
+    };
+  }
+
+  function closeContextMenu() {
+    contextMenu = { show: false, x: 0, y: 0, targetEntry: null };
+  }
+
+  function openNewFileDialog(parentPath: string) {
+    dialog = { type: "newFile", parentPath, targetEntry: null };
+  }
+
+  function openNewFolderDialog(parentPath: string) {
+    dialog = { type: "newFolder", parentPath, targetEntry: null };
+  }
+
+  function openDeleteDialog(entry: FileEntry) {
+    dialog = { type: "delete", parentPath: "", targetEntry: entry };
+  }
+
+  function openRenameDialog(entry: FileEntry) {
+    dialog = { type: "rename", parentPath: "", targetEntry: entry };
+  }
+
+  function closeDialog() {
+    dialog = { type: null, parentPath: "", targetEntry: null };
+  }
+
+  async function handleCreateFile(fileName: string) {
+    await editorStore.createFile(dialog.parentPath, fileName);
+    closeDialog();
+  }
+
+  async function handleCreateFolder(folderName: string) {
+    await editorStore.createDirectory(dialog.parentPath, folderName);
+    closeDialog();
+  }
+
+  async function handleDelete() {
+    if (!dialog.targetEntry) return;
+
+    if (dialog.targetEntry.isDirectory) {
+      await editorStore.deleteDirectory(dialog.targetEntry.path);
+    } else {
+      await editorStore.deleteFile(dialog.targetEntry.path);
+    }
+    closeDialog();
+  }
+
+  async function handleRename(newName: string) {
+    if (!dialog.targetEntry) return;
+    await editorStore.renamePath(dialog.targetEntry.path, newName);
+    closeDialog();
+  }
+
+  function handleNewFile() {
+    openNewFileDialog($currentDirectory);
+  }
+
+  function handleNewFolder() {
+    openNewFolderDialog($currentDirectory);
+  }
+</script>
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="file-browser" oncontextmenu={(e) => handleContextMenu(e, null)}>
+  <div class="header">
+    <span class="title">Files</span>
+    <div class="header-buttons">
+      <button class="header-button" onclick={handleNewFile} title="New File (Ctrl+N)">
+        <svg
+          width="14"
+          height="14"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+          <path d="M14 2v6h6" />
+          <path d="M12 18v-6" />
+          <path d="M9 15h6" />
+        </svg>
+      </button>
+      <button class="header-button" onclick={handleNewFolder} title="New Folder">
+        <svg
+          width="14"
+          height="14"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
+          <path d="M12 11v6" />
+          <path d="M9 14h6" />
+        </svg>
+      </button>
+      <button class="header-button" onclick={handleRefresh} title="Refresh file tree">
+        <svg
+          width="14"
+          height="14"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <path d="M23 4v6h-6" />
+          <path d="M1 20v-6h6" />
+          <path d="M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15" />
+        </svg>
+      </button>
+    </div>
+  </div>
+
+  <div class="tree-container">
+    {#if $isLoadingTree}
+      <div class="loading">
+        <svg
+          class="spinner"
+          width="20"
+          height="20"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <circle cx="12" cy="12" r="10" stroke-dasharray="32" stroke-dashoffset="32">
+            <animate
+              attributeName="stroke-dashoffset"
+              dur="1s"
+              values="32;0"
+              repeatCount="indefinite"
+            />
+          </circle>
+        </svg>
+        <span>Loading...</span>
+      </div>
+    {:else if $fileTree.length === 0}
+      <div class="empty">
+        <span>No files found</span>
+      </div>
+    {:else}
+      <div class="tree">
+        {#each $fileTree as entry (entry.path)}
+          <FileTreeItem {entry} onContextMenu={handleContextMenu} />
+        {/each}
+      </div>
+    {/if}
+  </div>
+</div>
+
+{#if contextMenu.show}
+  <FileContextMenu
+    x={contextMenu.x}
+    y={contextMenu.y}
+    targetEntry={contextMenu.targetEntry}
+    currentDirectory={$currentDirectory}
+    onNewFile={openNewFileDialog}
+    onNewFolder={openNewFolderDialog}
+    onRename={openRenameDialog}
+    onDelete={openDeleteDialog}
+    onClose={closeContextMenu}
+  />
+{/if}
+
+{#if dialog.type === "newFile"}
+  <InputDialog
+    title="New File"
+    placeholder="Enter file name..."
+    confirmText="Create"
+    onConfirm={handleCreateFile}
+    onCancel={closeDialog}
+  />
+{/if}
+
+{#if dialog.type === "newFolder"}
+  <InputDialog
+    title="New Folder"
+    placeholder="Enter folder name..."
+    confirmText="Create"
+    onConfirm={handleCreateFolder}
+    onCancel={closeDialog}
+  />
+{/if}
+
+{#if dialog.type === "delete" && dialog.targetEntry}
+  <ConfirmDialog
+    title="Delete {dialog.targetEntry.isDirectory ? 'Folder' : 'File'}"
+    message="Are you sure you want to delete '{dialog.targetEntry.name}'? {dialog.targetEntry
+      .isDirectory
+      ? 'This will also delete all files and folders inside it.'
+      : 'This action cannot be undone.'}"
+    confirmText="Delete"
+    destructive={true}
+    onConfirm={handleDelete}
+    onCancel={closeDialog}
+  />
+{/if}
+
+{#if dialog.type === "rename" && dialog.targetEntry}
+  <InputDialog
+    title="Rename {dialog.targetEntry.isDirectory ? 'Folder' : 'File'}"
+    placeholder="Enter new name..."
+    confirmText="Rename"
+    initialValue={dialog.targetEntry.name}
+    onConfirm={handleRename}
+    onCancel={closeDialog}
+  />
+{/if}
+
+<style>
+  .file-browser {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+    background-color: var(--bg-primary);
+    border-right: 1px solid var(--border-color);
+  }
+
+  .header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 8px 12px;
+    border-bottom: 1px solid var(--border-color);
+    background-color: var(--bg-secondary);
+  }
+
+  .title {
+    font-size: 12px;
+    font-weight: 600;
+    text-transform: uppercase;
+    color: var(--text-secondary);
+    letter-spacing: 0.5px;
+  }
+
+  .header-buttons {
+    display: flex;
+    gap: 4px;
+  }
+
+  .header-button {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 4px;
+    background: transparent;
+    border: none;
+    color: var(--text-secondary);
+    cursor: pointer;
+    border-radius: 4px;
+    transition: all 0.15s ease;
+  }
+
+  .header-button:hover {
+    background-color: var(--bg-primary);
+    color: var(--text-primary);
+  }
+
+  .tree-container {
+    flex: 1;
+    overflow-y: auto;
+    padding: 4px 0;
+  }
+
+  .tree {
+    min-width: max-content;
+  }
+
+  .loading,
+  .empty {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 8px;
+    padding: 24px;
+    color: var(--text-secondary);
+    font-size: 13px;
+  }
+
+  .spinner {
+    animation: spin 1s linear infinite;
+  }
+
+  @keyframes spin {
+    from {
+      transform: rotate(0deg);
+    }
+    to {
+      transform: rotate(360deg);
+    }
+  }
+</style>

src/lib/components/editor/FileContextMenu.svelte

@@ -0,0 +1,203 @@
+<script lang="ts">
+  import type { FileEntry } from "$lib/types/editor";
+
+  interface Props {
+    x: number;
+    y: number;
+    targetEntry: FileEntry | null;
+    currentDirectory: string;
+    onNewFile: (parentPath: string) => void;
+    onNewFolder: (parentPath: string) => void;
+    onRename: (entry: FileEntry) => void;
+    onDelete: (entry: FileEntry) => void;
+    onClose: () => void;
+  }
+
+  let {
+    x,
+    y,
+    targetEntry,
+    currentDirectory,
+    onNewFile,
+    onNewFolder,
+    onRename,
+    onDelete,
+    onClose,
+  }: Props = $props();
+
+  function handleNewFile() {
+    const parentPath = targetEntry?.isDirectory ? targetEntry.path : currentDirectory;
+    onNewFile(parentPath);
+    onClose();
+  }
+
+  function handleNewFolder() {
+    const parentPath = targetEntry?.isDirectory ? targetEntry.path : currentDirectory;
+    onNewFolder(parentPath);
+    onClose();
+  }
+
+  function handleRename() {
+    if (targetEntry) {
+      onRename(targetEntry);
+      onClose();
+    }
+  }
+
+  function handleDelete() {
+    if (targetEntry) {
+      onDelete(targetEntry);
+      onClose();
+    }
+  }
+
+  function handleKeydown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      onClose();
+    }
+  }
+
+  // Menu element reference for measuring
+  let menuElement: HTMLDivElement | undefined = $state();
+
+  // Adjusted position to keep menu within viewport
+  let adjustedX = $derived.by(() => {
+    if (!menuElement) return x;
+    const menuWidth = menuElement.offsetWidth || 160;
+    const maxX = window.innerWidth - menuWidth - 8;
+    return Math.min(x, maxX);
+  });
+
+  let adjustedY = $derived.by(() => {
+    if (!menuElement) return y;
+    const menuHeight = menuElement.offsetHeight || 200;
+    const maxY = window.innerHeight - menuHeight - 8;
+    return Math.min(y, maxY);
+  });
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div
+  class="menu-overlay"
+  onclick={onClose}
+  oncontextmenu={(e) => {
+    e.preventDefault();
+    onClose();
+  }}
+>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    bind:this={menuElement}
+    class="menu-content"
+    style="left: {adjustedX}px; top: {adjustedY}px;"
+    onclick={(e) => e.stopPropagation()}
+  >
+    <button class="menu-item" onclick={handleNewFile}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M9 13h6m-3-3v6m5 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"
+        />
+      </svg>
+      New File
+    </button>
+
+    <button class="menu-item" onclick={handleNewFolder}>
+      <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path
+          stroke-linecap="round"
+          stroke-linejoin="round"
+          stroke-width="2"
+          d="M9 13h6m-3-3v6m-9 1V7a2 2 0 012-2h6l2 2h6a2 2 0 012 2v8a2 2 0 01-2 2H5a2 2 0 01-2-2z"
+        />
+      </svg>
+      New Folder
+    </button>
+
+    {#if targetEntry}
+      <div class="menu-divider"></div>
+
+      <button class="menu-item" onclick={handleRename}>
+        <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path
+            stroke-linecap="round"
+            stroke-linejoin="round"
+            stroke-width="2"
+            d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z"
+          />
+        </svg>
+        Rename
+      </button>
+
+      <button class="menu-item destructive" onclick={handleDelete}>
+        <svg class="menu-icon" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path
+            stroke-linecap="round"
+            stroke-linejoin="round"
+            stroke-width="2"
+            d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"
+          />
+        </svg>
+        Delete {targetEntry.isDirectory ? "Folder" : "File"}
+      </button>
+    {/if}
+  </div>
+</div>
+
+<style>
+  .menu-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 50;
+  }
+
+  .menu-content {
+    position: absolute;
+    z-index: 50;
+    min-width: 160px;
+    border-radius: 0.375rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-secondary);
+    padding: 0.25rem 0;
+    box-shadow:
+      0 10px 15px -3px rgba(0, 0, 0, 0.1),
+      0 4px 6px -2px rgba(0, 0, 0, 0.05);
+  }
+
+  .menu-item {
+    display: flex;
+    width: 100%;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.375rem 0.75rem;
+    text-align: left;
+    font-size: 0.875rem;
+    color: var(--text-primary);
+    background: transparent;
+    border: none;
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .menu-item:hover {
+    background-color: var(--bg-primary);
+  }
+
+  .menu-item.destructive {
+    color: #ef4444;
+  }
+
+  .menu-divider {
+    margin: 0.25rem 0;
+    border-top: 1px solid var(--border-color);
+  }
+
+  .menu-icon {
+    width: 1rem;
+    height: 1rem;
+  }
+</style>

src/lib/components/editor/FileTreeItem.svelte

@@ -0,0 +1,208 @@
+<script lang="ts">
+  import type { FileEntry } from "$lib/types/editor";
+  import { editorStore } from "$lib/stores/editor";
+  import Self from "./FileTreeItem.svelte";
+
+  interface Props {
+    entry: FileEntry;
+    depth?: number;
+    onContextMenu?: (event: MouseEvent, entry: FileEntry) => void;
+  }
+
+  let { entry, depth = 0, onContextMenu }: Props = $props();
+
+  function handleClick() {
+    if (entry.isDirectory) {
+      editorStore.toggleDirectory(entry);
+    } else {
+      editorStore.openFile(entry.path);
+    }
+  }
+
+  function handleKeydown(event: KeyboardEvent) {
+    if (event.key === "Enter" || event.key === " ") {
+      event.preventDefault();
+      handleClick();
+    }
+  }
+
+  function handleContextMenu(event: MouseEvent) {
+    event.preventDefault();
+    event.stopPropagation();
+    onContextMenu?.(event, entry);
+  }
+
+  const isExpanded = $derived(entry.isExpanded ?? false);
+  const isLoading = $derived(entry.isLoading ?? false);
+  const children = $derived(entry.children ?? []);
+</script>
+
+<div class="file-tree-item">
+  <button
+    class="item-row"
+    class:directory={entry.isDirectory}
+    class:file={!entry.isDirectory}
+    style="padding-left: {depth * 16 + 8}px"
+    onclick={handleClick}
+    onkeydown={handleKeydown}
+    oncontextmenu={handleContextMenu}
+    title={entry.path}
+  >
+    {#if entry.isDirectory}
+      <span class="icon">
+        {#if isLoading}
+          <svg
+            class="spinner"
+            width="14"
+            height="14"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+          >
+            <circle cx="12" cy="12" r="10" stroke-dasharray="32" stroke-dashoffset="32">
+              <animate
+                attributeName="stroke-dashoffset"
+                dur="1s"
+                values="32;0"
+                repeatCount="indefinite"
+              />
+            </circle>
+          </svg>
+        {:else if isExpanded}
+          <svg
+            width="14"
+            height="14"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+          >
+            <path d="M6 9l6 6 6-6" />
+          </svg>
+        {:else}
+          <svg
+            width="14"
+            height="14"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            stroke-width="2"
+          >
+            <path d="M9 6l6 6-6 6" />
+          </svg>
+        {/if}
+      </span>
+      <span class="folder-icon">
+        <svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor">
+          <path
+            d="M10 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2h-8l-2-2z"
+          />
+        </svg>
+      </span>
+    {:else}
+      <span class="icon spacer"></span>
+      <span class="file-icon">
+        <svg
+          width="14"
+          height="14"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          stroke-width="2"
+        >
+          <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" />
+          <polyline points="14 2 14 8 20 8" />
+        </svg>
+      </span>
+    {/if}
+    <span class="name">{entry.name}</span>
+  </button>
+
+  {#if entry.isDirectory && isExpanded && children.length > 0}
+    <div class="children">
+      {#each children as child (child.path)}
+        <Self entry={child} depth={depth + 1} {onContextMenu} />
+      {/each}
+    </div>
+  {/if}
+</div>
+
+<style>
+  .file-tree-item {
+    user-select: none;
+  }
+
+  .item-row {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+    width: 100%;
+    padding: 4px 8px;
+    background: transparent;
+    border: none;
+    color: var(--text-primary);
+    font-size: 13px;
+    cursor: pointer;
+    text-align: left;
+    border-radius: 4px;
+    transition: background-color 0.15s ease;
+  }
+
+  .item-row:hover {
+    background-color: var(--bg-secondary);
+  }
+
+  .item-row:focus {
+    outline: 1px solid var(--accent-primary);
+    outline-offset: -1px;
+  }
+
+  .icon {
+    flex-shrink: 0;
+    width: 14px;
+    height: 14px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: var(--text-secondary);
+  }
+
+  .icon.spacer {
+    visibility: hidden;
+  }
+
+  .folder-icon {
+    flex-shrink: 0;
+    color: var(--accent-primary);
+  }
+
+  .file-icon {
+    flex-shrink: 0;
+    color: var(--text-secondary);
+  }
+
+  .name {
+    flex: 1;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+
+  .children {
+    margin-left: 0;
+  }
+
+  .spinner {
+    animation: spin 1s linear infinite;
+  }
+
+  @keyframes spin {
+    from {
+      transform: rotate(0deg);
+    }
+    to {
+      transform: rotate(360deg);
+    }
+  }
+</style>

src/lib/components/editor/InputDialog.svelte

@@ -0,0 +1,173 @@
+<script lang="ts">
+  interface Props {
+    title: string;
+    placeholder?: string;
+    confirmText?: string;
+    cancelText?: string;
+    initialValue?: string;
+    onConfirm: (value: string) => void;
+    onCancel: () => void;
+  }
+
+  let {
+    title,
+    placeholder = "",
+    confirmText = "Create",
+    cancelText = "Cancel",
+    initialValue = "",
+    onConfirm,
+    onCancel,
+  }: Props = $props();
+
+  let inputValue = $state(initialValue);
+  let inputElement: HTMLInputElement | undefined = $state();
+
+  $effect(() => {
+    if (inputElement) {
+      inputElement.focus();
+      // Select all text for rename operations
+      if (initialValue) {
+        inputElement.select();
+      }
+    }
+  });
+
+  function handleSubmit() {
+    const trimmed = inputValue.trim();
+    if (trimmed) {
+      onConfirm(trimmed);
+    }
+  }
+
+  function handleKeydown(event: KeyboardEvent) {
+    if (event.key === "Escape") {
+      onCancel();
+    } else if (event.key === "Enter") {
+      handleSubmit();
+    }
+  }
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="dialog-overlay" onclick={onCancel}>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div class="dialog-content" onclick={(e) => e.stopPropagation()}>
+    <h2 class="dialog-title">{title}</h2>
+
+    <input
+      bind:this={inputElement}
+      bind:value={inputValue}
+      type="text"
+      {placeholder}
+      class="dialog-input"
+    />
+
+    <div class="dialog-actions">
+      <button class="btn-cancel" onclick={onCancel}>
+        {cancelText}
+      </button>
+      <button class="btn-confirm" onclick={handleSubmit} disabled={!inputValue.trim()}>
+        {confirmText}
+      </button>
+    </div>
+  </div>
+</div>
+
+<style>
+  .dialog-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 50;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background-color: rgba(0, 0, 0, 0.5);
+  }
+
+  .dialog-content {
+    margin: 0 1rem;
+    width: 100%;
+    max-width: 28rem;
+    border-radius: 0.5rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-secondary);
+    padding: 1.5rem;
+    box-shadow:
+      0 20px 25px -5px rgba(0, 0, 0, 0.1),
+      0 10px 10px -5px rgba(0, 0, 0, 0.04);
+  }
+
+  .dialog-title {
+    margin-bottom: 1rem;
+    font-size: 1.125rem;
+    font-weight: 600;
+    color: var(--text-primary);
+  }
+
+  .dialog-input {
+    width: 100%;
+    margin-bottom: 1.5rem;
+    padding: 0.5rem 0.75rem;
+    border-radius: 0.375rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-primary);
+    font-size: 0.875rem;
+    color: var(--text-primary);
+    outline: none;
+    transition:
+      border-color 0.15s ease,
+      box-shadow 0.15s ease;
+  }
+
+  .dialog-input::placeholder {
+    color: var(--text-secondary);
+  }
+
+  .dialog-input:focus {
+    border-color: var(--accent-primary);
+    box-shadow: 0 0 0 1px var(--accent-primary);
+  }
+
+  .dialog-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 0.75rem;
+  }
+
+  .btn-cancel {
+    border-radius: 0.375rem;
+    border: 1px solid var(--border-color);
+    background-color: var(--bg-primary);
+    padding: 0.5rem 1rem;
+    font-size: 0.875rem;
+    color: var(--text-primary);
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .btn-cancel:hover {
+    background-color: var(--bg-secondary);
+  }
+
+  .btn-confirm {
+    border-radius: 0.375rem;
+    border: none;
+    background-color: var(--accent-primary);
+    padding: 0.5rem 1rem;
+    font-size: 0.875rem;
+    color: white;
+    cursor: pointer;
+    transition: background-color 0.15s ease;
+  }
+
+  .btn-confirm:hover {
+    background-color: var(--accent-secondary);
+  }
+
+  .btn-confirm:disabled {
+    cursor: not-allowed;
+    opacity: 0.5;
+  }
+</style>

src/lib/notifications/notificationManager.ts

@@ -90,6 +90,8 @@ class NotificationManager {
         return "Successfully connected to Claude Code";
       case NotificationType.TASK_START:
         return "Starting task...";
+      case NotificationType.COST_ALERT:
+        return "You've exceeded your cost threshold!";
       default:
         return "Notification";
     }
@@ -115,6 +117,10 @@ class NotificationManager {
   async notifyTaskStart(message?: string): Promise<void> {
     await this.notify(NotificationType.TASK_START, message);
   }
+
+  async notifyCostAlert(message?: string): Promise<void> {
+    await this.notify(NotificationType.COST_ALERT, message);
+  }
 }
 
 // Export singleton instance

src/lib/notifications/notifications.test.ts

@@ -0,0 +1,334 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { NotificationType, NOTIFICATION_SOUNDS, type NotificationSound } from "./types";
+
+// Mock HTMLAudioElement for soundPlayer tests
+class MockAudioElement {
+  src: string = "";
+  preload: string = "";
+  volume: number = 1;
+
+  constructor(src?: string) {
+    if (src) this.src = src;
+  }
+
+  cloneNode(): MockAudioElement {
+    const clone = new MockAudioElement(this.src);
+    clone.volume = this.volume;
+    return clone;
+  }
+
+  async play(): Promise<void> {
+    return Promise.resolve();
+  }
+}
+
+// Store original Audio before mocking
+const OriginalAudio = globalThis.Audio;
+
+describe("notifications", () => {
+  describe("NotificationType enum", () => {
+    it("has SUCCESS type", () => {
+      expect(NotificationType.SUCCESS).toBe("success");
+    });
+
+    it("has ERROR type", () => {
+      expect(NotificationType.ERROR).toBe("error");
+    });
+
+    it("has PERMISSION type", () => {
+      expect(NotificationType.PERMISSION).toBe("permission");
+    });
+
+    it("has CONNECTION type", () => {
+      expect(NotificationType.CONNECTION).toBe("connection");
+    });
+
+    it("has TASK_START type", () => {
+      expect(NotificationType.TASK_START).toBe("task_start");
+    });
+
+    it("has ACHIEVEMENT type", () => {
+      expect(NotificationType.ACHIEVEMENT).toBe("achievement");
+    });
+
+    it("has exactly 7 notification types", () => {
+      const types = Object.values(NotificationType);
+      expect(types.length).toBe(7);
+    });
+
+    it("has COST_ALERT type", () => {
+      expect(NotificationType.COST_ALERT).toBe("cost_alert");
+    });
+  });
+
+  describe("NOTIFICATION_SOUNDS constant", () => {
+    it("has sounds for all notification types", () => {
+      Object.values(NotificationType).forEach((type) => {
+        expect(NOTIFICATION_SOUNDS[type]).toBeDefined();
+      });
+    });
+
+    it("each sound has required properties", () => {
+      Object.values(NOTIFICATION_SOUNDS).forEach((sound) => {
+        expect(sound.type).toBeDefined();
+        expect(sound.filename).toBeDefined();
+        expect(sound.phrase).toBeDefined();
+        expect(typeof sound.filename).toBe("string");
+        expect(typeof sound.phrase).toBe("string");
+        expect(sound.filename.endsWith(".mp3")).toBe(true);
+      });
+    });
+
+    it("SUCCESS sound has correct properties", () => {
+      const sound = NOTIFICATION_SOUNDS[NotificationType.SUCCESS];
+      expect(sound.type).toBe(NotificationType.SUCCESS);
+      expect(sound.filename).toBe("im-done.mp3");
+      expect(sound.phrase).toBe("I'm done!");
+      expect(sound.volume).toBe(0.7);
+    });
+
+    it("ERROR sound has correct properties", () => {
+      const sound = NOTIFICATION_SOUNDS[NotificationType.ERROR];
+      expect(sound.type).toBe(NotificationType.ERROR);
+      expect(sound.filename).toBe("oh-no.mp3");
+      expect(sound.phrase).toBe("Oh no...");
+      expect(sound.volume).toBe(0.8);
+    });
+
+    it("PERMISSION sound has correct properties", () => {
+      const sound = NOTIFICATION_SOUNDS[NotificationType.PERMISSION];
+      expect(sound.type).toBe(NotificationType.PERMISSION);
+      expect(sound.filename).toBe("access-please.mp3");
+      expect(sound.phrase).toBe("Access please!");
+      expect(sound.volume).toBe(0.9);
+    });
+
+    it("CONNECTION sound has correct properties", () => {
+      const sound = NOTIFICATION_SOUNDS[NotificationType.CONNECTION];
+      expect(sound.type).toBe(NotificationType.CONNECTION);
+      expect(sound.filename).toBe("connected.mp3");
+      expect(sound.phrase).toBe("Connected!");
+      expect(sound.volume).toBe(0.7);
+    });
+
+    it("TASK_START sound has correct properties", () => {
+      const sound = NOTIFICATION_SOUNDS[NotificationType.TASK_START];
+      expect(sound.type).toBe(NotificationType.TASK_START);
+      expect(sound.filename).toBe("working-on-it.mp3");
+      expect(sound.phrase).toBe("Working on it!");
+      expect(sound.volume).toBe(0.6);
+    });
+
+    it("ACHIEVEMENT sound has correct properties", () => {
+      const sound = NOTIFICATION_SOUNDS[NotificationType.ACHIEVEMENT];
+      expect(sound.type).toBe(NotificationType.ACHIEVEMENT);
+      expect(sound.filename).toBe("achievement.mp3");
+      expect(sound.phrase).toBe("Achievement Get~!");
+      expect(sound.volume).toBe(0.8);
+    });
+
+    it("all volumes are within valid range (0-1)", () => {
+      Object.values(NOTIFICATION_SOUNDS).forEach((sound) => {
+        if (sound.volume !== undefined) {
+          expect(sound.volume).toBeGreaterThanOrEqual(0);
+          expect(sound.volume).toBeLessThanOrEqual(1);
+        }
+      });
+    });
+  });
+
+  describe("NotificationSound interface", () => {
+    it("can create a valid notification sound object", () => {
+      const sound: NotificationSound = {
+        type: NotificationType.SUCCESS,
+        filename: "test-sound.mp3",
+        phrase: "Test phrase",
+        volume: 0.5,
+      };
+
+      expect(sound.type).toBe(NotificationType.SUCCESS);
+      expect(sound.filename).toBe("test-sound.mp3");
+      expect(sound.phrase).toBe("Test phrase");
+      expect(sound.volume).toBe(0.5);
+    });
+
+    it("volume is optional", () => {
+      const sound: NotificationSound = {
+        type: NotificationType.ERROR,
+        filename: "error.mp3",
+        phrase: "Error occurred",
+      };
+
+      expect(sound.volume).toBeUndefined();
+    });
+  });
+
+  describe("SoundPlayer class", () => {
+    beforeEach(() => {
+      // Mock Audio constructor
+      globalThis.Audio = MockAudioElement as unknown as typeof Audio;
+    });
+
+    afterEach(() => {
+      // Restore original Audio
+      globalThis.Audio = OriginalAudio;
+      vi.resetModules();
+    });
+
+    it("can import soundPlayer singleton", async () => {
+      const { soundPlayer } = await import("./soundPlayer");
+      expect(soundPlayer).toBeDefined();
+    });
+
+    it("setEnabled changes enabled state", async () => {
+      const { soundPlayer } = await import("./soundPlayer");
+
+      soundPlayer.setEnabled(true);
+      expect(soundPlayer.isEnabled()).toBe(true);
+
+      soundPlayer.setEnabled(false);
+      expect(soundPlayer.isEnabled()).toBe(false);
+    });
+
+    it("starts disabled by default", async () => {
+      // Need to reimport to get fresh instance behavior
+      // But since it's a singleton, we just test the method
+      const { soundPlayer } = await import("./soundPlayer");
+
+      // Reset to default state
+      soundPlayer.setEnabled(false);
+      expect(soundPlayer.isEnabled()).toBe(false);
+    });
+
+    it("setGlobalVolume clamps values to 0-1 range", async () => {
+      const { soundPlayer } = await import("./soundPlayer");
+
+      // Test that it doesn't throw on edge cases
+      soundPlayer.setGlobalVolume(0);
+      soundPlayer.setGlobalVolume(1);
+      soundPlayer.setGlobalVolume(0.5);
+
+      // Test clamping below 0
+      soundPlayer.setGlobalVolume(-0.5);
+
+      // Test clamping above 1
+      soundPlayer.setGlobalVolume(1.5);
+    });
+
+    it("play returns early when disabled", async () => {
+      const { soundPlayer } = await import("./soundPlayer");
+
+      soundPlayer.setEnabled(false);
+
+      // Should not throw when disabled
+      await expect(soundPlayer.play(NotificationType.SUCCESS)).resolves.toBeUndefined();
+    });
+
+    it("play attempts to play when enabled", async () => {
+      const { soundPlayer } = await import("./soundPlayer");
+
+      soundPlayer.setEnabled(true);
+
+      // Should not throw
+      await expect(soundPlayer.play(NotificationType.SUCCESS)).resolves.toBeUndefined();
+    });
+  });
+
+  describe("NotificationManager class", () => {
+    beforeEach(() => {
+      globalThis.Audio = MockAudioElement as unknown as typeof Audio;
+      vi.resetModules();
+    });
+
+    afterEach(() => {
+      globalThis.Audio = OriginalAudio;
+    });
+
+    it("can import notificationManager singleton", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(notificationManager).toBeDefined();
+    });
+
+    it("has notifySuccess method", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(typeof notificationManager.notifySuccess).toBe("function");
+    });
+
+    it("has notifyError method", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(typeof notificationManager.notifyError).toBe("function");
+    });
+
+    it("has notifyPermission method", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(typeof notificationManager.notifyPermission).toBe("function");
+    });
+
+    it("has notifyConnection method", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(typeof notificationManager.notifyConnection).toBe("function");
+    });
+
+    it("has notifyTaskStart method", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(typeof notificationManager.notifyTaskStart).toBe("function");
+    });
+
+    it("has notify method", async () => {
+      vi.mock("@tauri-apps/api/core", () => ({
+        invoke: vi.fn().mockRejectedValue(new Error("Not available")),
+      }));
+
+      const { notificationManager } = await import("./notificationManager");
+      expect(typeof notificationManager.notify).toBe("function");
+    });
+  });
+
+  describe("notification sounds file paths", () => {
+    it("all sound files have valid paths", () => {
+      Object.values(NOTIFICATION_SOUNDS).forEach((sound) => {
+        // Check that filename doesn't contain path traversal
+        expect(sound.filename).not.toContain("..");
+        expect(sound.filename).not.toContain("/");
+        expect(sound.filename).not.toContain("\\");
+      });
+    });
+
+    it("sound filenames are mostly unique", () => {
+      const filenames = Object.values(NOTIFICATION_SOUNDS).map((s) => s.filename);
+      const uniqueFilenames = new Set(filenames);
+      // Allow some sound reuse (e.g., COST_ALERT reuses ERROR sound)
+      expect(uniqueFilenames.size).toBeGreaterThanOrEqual(filenames.length - 1);
+    });
+
+    it("phrases are unique", () => {
+      const phrases = Object.values(NOTIFICATION_SOUNDS).map((s) => s.phrase);
+      const uniquePhrases = new Set(phrases);
+      expect(uniquePhrases.size).toBe(phrases.length);
+    });
+  });
+});

src/lib/notifications/types.ts

@@ -5,6 +5,7 @@ export enum NotificationType {
   CONNECTION = "connection",
   TASK_START = "task_start",
   ACHIEVEMENT = "achievement",
+  COST_ALERT = "cost_alert",
 }
 
 export interface NotificationSound {
@@ -52,4 +53,10 @@ export const NOTIFICATION_SOUNDS: Record<NotificationType, NotificationSound> =
     phrase: "Achievement Get~!",
     volume: 0.8,
   },
+  [NotificationType.COST_ALERT]: {
+    type: NotificationType.COST_ALERT,
+    filename: "oh-no.mp3",
+    phrase: "Cost Alert!",
+    volume: 0.9,
+  },
 };

src/lib/stores/config.test.ts

@@ -0,0 +1,490 @@
+import { describe, it, expect, beforeEach, vi } from "vitest";
+import {
+  configStore,
+  maskPaths,
+  clampFontSize,
+  applyFontSize,
+  applyTheme,
+  applyCustomThemeColors,
+  clearCustomThemeColors,
+  MIN_FONT_SIZE,
+  MAX_FONT_SIZE,
+  DEFAULT_FONT_SIZE,
+  type HikariConfig,
+  type Theme,
+  type CustomThemeColors,
+} from "./config";
+
+// Mock Tauri APIs
+vi.mock("@tauri-apps/api/core", () => ({
+  invoke: vi.fn(),
+}));
+
+describe("config store", () => {
+  describe("font size constants", () => {
+    it("has correct MIN_FONT_SIZE", () => {
+      expect(MIN_FONT_SIZE).toBe(10);
+    });
+
+    it("has correct MAX_FONT_SIZE", () => {
+      expect(MAX_FONT_SIZE).toBe(24);
+    });
+
+    it("has correct DEFAULT_FONT_SIZE", () => {
+      expect(DEFAULT_FONT_SIZE).toBe(14);
+    });
+  });
+
+  describe("clampFontSize", () => {
+    it("returns the same value when within range", () => {
+      expect(clampFontSize(14)).toBe(14);
+      expect(clampFontSize(10)).toBe(10);
+      expect(clampFontSize(24)).toBe(24);
+      expect(clampFontSize(18)).toBe(18);
+    });
+
+    it("clamps values below minimum", () => {
+      expect(clampFontSize(5)).toBe(MIN_FONT_SIZE);
+      expect(clampFontSize(0)).toBe(MIN_FONT_SIZE);
+      expect(clampFontSize(-10)).toBe(MIN_FONT_SIZE);
+      expect(clampFontSize(9)).toBe(MIN_FONT_SIZE);
+    });
+
+    it("clamps values above maximum", () => {
+      expect(clampFontSize(30)).toBe(MAX_FONT_SIZE);
+      expect(clampFontSize(100)).toBe(MAX_FONT_SIZE);
+      expect(clampFontSize(25)).toBe(MAX_FONT_SIZE);
+    });
+  });
+
+  describe("maskPaths", () => {
+    it("returns text unchanged when hidePaths is false", () => {
+      const text = "/home/naomi/code/project/file.ts";
+      expect(maskPaths(text, false)).toBe(text);
+    });
+
+    it("masks Unix home paths", () => {
+      const text = "/home/naomi/code/project/file.ts";
+      expect(maskPaths(text, true)).toBe("/home/****/code/project/file.ts");
+    });
+
+    it("masks macOS user paths", () => {
+      const text = "/Users/naomi/Documents/project/file.ts";
+      expect(maskPaths(text, true)).toBe("/Users/****/Documents/project/file.ts");
+    });
+
+    it("masks Windows user paths", () => {
+      const text = "C:\\Users\\naomi\\Documents\\project\\file.ts";
+      expect(maskPaths(text, true)).toBe("C:\\Users\\****\\Documents\\project\\file.ts");
+    });
+
+    it("masks tilde paths", () => {
+      const text = "~/code/project/file.ts";
+      expect(maskPaths(text, true)).toBe("****/code/project/file.ts");
+    });
+
+    it("masks multiple paths in the same text", () => {
+      const text = "Editing /home/naomi/file1.ts and /home/naomi/file2.ts";
+      expect(maskPaths(text, true)).toBe("Editing /home/****/file1.ts and /home/****/file2.ts");
+    });
+
+    it("handles mixed path types", () => {
+      const text = "Unix: /home/user/file, Mac: /Users/user/file, Win: C:\\Users\\user\\file";
+      const expected = "Unix: /home/****/file, Mac: /Users/****/file, Win: C:\\Users\\****\\file";
+      expect(maskPaths(text, true)).toBe(expected);
+    });
+
+    it("handles paths with special characters in username", () => {
+      const text = "/home/user-name_123/project";
+      expect(maskPaths(text, true)).toBe("/home/****/project");
+    });
+
+    it("does not mask non-path text", () => {
+      const text = "This is just regular text without any paths";
+      expect(maskPaths(text, true)).toBe(text);
+    });
+
+    it("handles empty string", () => {
+      expect(maskPaths("", true)).toBe("");
+      expect(maskPaths("", false)).toBe("");
+    });
+  });
+
+  describe("Theme type", () => {
+    it("accepts valid theme values", () => {
+      const themes: Theme[] = ["dark", "light", "high-contrast", "custom"];
+      themes.forEach((theme) => {
+        expect(["dark", "light", "high-contrast", "custom"]).toContain(theme);
+      });
+    });
+  });
+
+  describe("CustomThemeColors interface", () => {
+    it("can create a valid custom theme colors object", () => {
+      const colors: CustomThemeColors = {
+        bg_primary: "#1a1a2e",
+        bg_secondary: "#16213e",
+        bg_terminal: "#0f0f23",
+        accent_primary: "#e94560",
+        accent_secondary: "#533483",
+        text_primary: "#eaeaea",
+        text_secondary: "#a0a0a0",
+        border_color: "#333355",
+      };
+
+      expect(colors.bg_primary).toBe("#1a1a2e");
+      expect(colors.accent_primary).toBe("#e94560");
+    });
+
+    it("allows null values for optional colors", () => {
+      const colors: CustomThemeColors = {
+        bg_primary: null,
+        bg_secondary: null,
+        bg_terminal: null,
+        accent_primary: "#e94560",
+        accent_secondary: null,
+        text_primary: null,
+        text_secondary: null,
+        border_color: null,
+      };
+
+      expect(colors.bg_primary).toBeNull();
+      expect(colors.accent_primary).toBe("#e94560");
+    });
+  });
+
+  describe("HikariConfig interface", () => {
+    it("can create a valid config object with all fields", () => {
+      const config: HikariConfig = {
+        model: "claude-sonnet-4",
+        api_key: "test-key",
+        custom_instructions: "Be helpful",
+        mcp_servers_json: "{}",
+        auto_granted_tools: ["Read", "Write"],
+        theme: "dark",
+        greeting_enabled: true,
+        greeting_custom_prompt: "Hello!",
+        notifications_enabled: true,
+        notification_volume: 0.7,
+        always_on_top: false,
+        minimize_to_tray: true,
+        update_checks_enabled: true,
+        character_panel_width: 300,
+        font_size: 14,
+        streamer_mode: false,
+        streamer_hide_paths: false,
+        compact_mode: false,
+        profile_name: "Naomi",
+        profile_avatar_path: "/path/to/avatar.png",
+        profile_bio: "Developer",
+        custom_theme_colors: {
+          bg_primary: null,
+          bg_secondary: null,
+          bg_terminal: null,
+          accent_primary: null,
+          accent_secondary: null,
+          text_primary: null,
+          text_secondary: null,
+          border_color: null,
+        },
+        budget_enabled: false,
+        session_token_budget: null,
+        session_cost_budget: null,
+        budget_action: "warn",
+        budget_warning_threshold: 0.8,
+      };
+
+      expect(config.model).toBe("claude-sonnet-4");
+      expect(config.auto_granted_tools).toEqual(["Read", "Write"]);
+      expect(config.theme).toBe("dark");
+    });
+
+    it("allows null values for optional fields", () => {
+      const config: HikariConfig = {
+        model: null,
+        api_key: null,
+        custom_instructions: null,
+        mcp_servers_json: null,
+        auto_granted_tools: [],
+        theme: "dark",
+        greeting_enabled: true,
+        greeting_custom_prompt: null,
+        notifications_enabled: true,
+        notification_volume: 0.7,
+        always_on_top: false,
+        minimize_to_tray: false,
+        update_checks_enabled: true,
+        character_panel_width: null,
+        font_size: 14,
+        streamer_mode: false,
+        streamer_hide_paths: false,
+        compact_mode: false,
+        profile_name: null,
+        profile_avatar_path: null,
+        profile_bio: null,
+        custom_theme_colors: {
+          bg_primary: null,
+          bg_secondary: null,
+          bg_terminal: null,
+          accent_primary: null,
+          accent_secondary: null,
+          text_primary: null,
+          text_secondary: null,
+          border_color: null,
+        },
+        budget_enabled: false,
+        session_token_budget: null,
+        session_cost_budget: null,
+        budget_action: "warn",
+        budget_warning_threshold: 0.8,
+      };
+
+      expect(config.model).toBeNull();
+      expect(config.api_key).toBeNull();
+      expect(config.character_panel_width).toBeNull();
+    });
+  });
+
+  describe("applyFontSize", () => {
+    beforeEach(() => {
+      // Reset document state
+      if (typeof document !== "undefined") {
+        document.documentElement.style.removeProperty("--terminal-font-size");
+      }
+    });
+
+    it("sets CSS variable for valid font size", () => {
+      applyFontSize(16);
+      const value = document.documentElement.style.getPropertyValue("--terminal-font-size");
+      expect(value).toBe("16px");
+    });
+
+    it("clamps font size below minimum", () => {
+      applyFontSize(5);
+      const value = document.documentElement.style.getPropertyValue("--terminal-font-size");
+      expect(value).toBe(`${MIN_FONT_SIZE}px`);
+    });
+
+    it("clamps font size above maximum", () => {
+      applyFontSize(50);
+      const value = document.documentElement.style.getPropertyValue("--terminal-font-size");
+      expect(value).toBe(`${MAX_FONT_SIZE}px`);
+    });
+  });
+
+  describe("applyTheme", () => {
+    beforeEach(() => {
+      // Reset document state
+      if (typeof document !== "undefined") {
+        document.documentElement.removeAttribute("data-theme");
+        clearCustomThemeColors();
+      }
+    });
+
+    it("sets data-theme attribute for dark theme", () => {
+      applyTheme("dark");
+      expect(document.documentElement.getAttribute("data-theme")).toBe("dark");
+    });
+
+    it("sets data-theme attribute for light theme", () => {
+      applyTheme("light");
+      expect(document.documentElement.getAttribute("data-theme")).toBe("light");
+    });
+
+    it("sets data-theme attribute for high-contrast theme", () => {
+      applyTheme("high-contrast");
+      expect(document.documentElement.getAttribute("data-theme")).toBe("high-contrast");
+    });
+
+    it("uses dark as base for custom theme", () => {
+      applyTheme("custom");
+      expect(document.documentElement.getAttribute("data-theme")).toBe("dark");
+    });
+
+    it("applies custom colors when theme is custom", () => {
+      const colors: CustomThemeColors = {
+        bg_primary: "#1a1a2e",
+        bg_secondary: null,
+        bg_terminal: null,
+        accent_primary: "#e94560",
+        accent_secondary: null,
+        text_primary: null,
+        text_secondary: null,
+        border_color: null,
+      };
+
+      applyTheme("custom", colors);
+
+      expect(document.documentElement.style.getPropertyValue("--bg-primary")).toBe("#1a1a2e");
+      expect(document.documentElement.style.getPropertyValue("--accent-primary")).toBe("#e94560");
+    });
+
+    it("does not apply custom colors for non-custom themes", () => {
+      const colors: CustomThemeColors = {
+        bg_primary: "#1a1a2e",
+        bg_secondary: null,
+        bg_terminal: null,
+        accent_primary: null,
+        accent_secondary: null,
+        text_primary: null,
+        text_secondary: null,
+        border_color: null,
+      };
+
+      applyTheme("dark", colors);
+
+      expect(document.documentElement.style.getPropertyValue("--bg-primary")).toBe("");
+    });
+  });
+
+  describe("applyCustomThemeColors", () => {
+    beforeEach(() => {
+      clearCustomThemeColors();
+    });
+
+    it("applies all provided colors", () => {
+      const colors: CustomThemeColors = {
+        bg_primary: "#111111",
+        bg_secondary: "#222222",
+        bg_terminal: "#333333",
+        accent_primary: "#444444",
+        accent_secondary: "#555555",
+        text_primary: "#666666",
+        text_secondary: "#777777",
+        border_color: "#888888",
+      };
+
+      applyCustomThemeColors(colors);
+
+      expect(document.documentElement.style.getPropertyValue("--bg-primary")).toBe("#111111");
+      expect(document.documentElement.style.getPropertyValue("--bg-secondary")).toBe("#222222");
+      expect(document.documentElement.style.getPropertyValue("--bg-terminal")).toBe("#333333");
+      expect(document.documentElement.style.getPropertyValue("--accent-primary")).toBe("#444444");
+      expect(document.documentElement.style.getPropertyValue("--accent-secondary")).toBe("#555555");
+      expect(document.documentElement.style.getPropertyValue("--text-primary")).toBe("#666666");
+      expect(document.documentElement.style.getPropertyValue("--text-secondary")).toBe("#777777");
+      expect(document.documentElement.style.getPropertyValue("--border-color")).toBe("#888888");
+    });
+
+    it("skips null values", () => {
+      const colors: CustomThemeColors = {
+        bg_primary: "#111111",
+        bg_secondary: null,
+        bg_terminal: null,
+        accent_primary: null,
+        accent_secondary: null,
+        text_primary: null,
+        text_secondary: null,
+        border_color: null,
+      };
+
+      applyCustomThemeColors(colors);
+
+      expect(document.documentElement.style.getPropertyValue("--bg-primary")).toBe("#111111");
+      expect(document.documentElement.style.getPropertyValue("--bg-secondary")).toBe("");
+    });
+  });
+
+  describe("clearCustomThemeColors", () => {
+    it("removes all custom theme CSS properties", () => {
+      // First apply some colors
+      const colors: CustomThemeColors = {
+        bg_primary: "#111111",
+        bg_secondary: "#222222",
+        bg_terminal: "#333333",
+        accent_primary: "#444444",
+        accent_secondary: "#555555",
+        text_primary: "#666666",
+        text_secondary: "#777777",
+        border_color: "#888888",
+      };
+      applyCustomThemeColors(colors);
+
+      // Then clear them
+      clearCustomThemeColors();
+
+      expect(document.documentElement.style.getPropertyValue("--bg-primary")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--bg-secondary")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--bg-terminal")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--accent-primary")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--accent-secondary")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--text-primary")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--text-secondary")).toBe("");
+      expect(document.documentElement.style.getPropertyValue("--border-color")).toBe("");
+    });
+  });
+
+  describe("derived stores", () => {
+    // Note: These tests verify the derived store logic by testing the derivation functions
+    // The actual stores depend on configStore which requires Tauri invoke mocking
+
+    it("isDarkTheme returns true for dark theme config", () => {
+      // Test the derivation logic
+      const darkConfig = { theme: "dark" as Theme };
+      expect(darkConfig.theme === "dark").toBe(true);
+    });
+
+    it("isDarkTheme returns false for light theme config", () => {
+      const lightConfig = { theme: "light" as Theme };
+      expect(lightConfig.theme === "dark").toBe(false);
+    });
+
+    it("isStreamerMode derives from streamer_mode config", () => {
+      const configWithStreamerMode = { streamer_mode: true };
+      const configWithoutStreamerMode = { streamer_mode: false };
+
+      expect(configWithStreamerMode.streamer_mode).toBe(true);
+      expect(configWithoutStreamerMode.streamer_mode).toBe(false);
+    });
+
+    it("isCompactMode derives from compact_mode config", () => {
+      const configWithCompactMode = { compact_mode: true };
+      const configWithoutCompactMode = { compact_mode: false };
+
+      expect(configWithCompactMode.compact_mode).toBe(true);
+      expect(configWithoutCompactMode.compact_mode).toBe(false);
+    });
+
+    it("shouldHidePaths requires both streamer_mode and streamer_hide_paths", () => {
+      const config1 = { streamer_mode: true, streamer_hide_paths: true };
+      const config2 = { streamer_mode: true, streamer_hide_paths: false };
+      const config3 = { streamer_mode: false, streamer_hide_paths: true };
+      const config4 = { streamer_mode: false, streamer_hide_paths: false };
+
+      expect(config1.streamer_mode && config1.streamer_hide_paths).toBe(true);
+      expect(config2.streamer_mode && config2.streamer_hide_paths).toBe(false);
+      expect(config3.streamer_mode && config3.streamer_hide_paths).toBe(false);
+      expect(config4.streamer_mode && config4.streamer_hide_paths).toBe(false);
+    });
+  });
+
+  describe("configStore methods", () => {
+    it("has all expected methods", () => {
+      expect(typeof configStore.loadConfig).toBe("function");
+      expect(typeof configStore.saveConfig).toBe("function");
+      expect(typeof configStore.updateConfig).toBe("function");
+      expect(typeof configStore.openSidebar).toBe("function");
+      expect(typeof configStore.closeSidebar).toBe("function");
+      expect(typeof configStore.toggleSidebar).toBe("function");
+      expect(typeof configStore.setTheme).toBe("function");
+      expect(typeof configStore.setCustomThemeColors).toBe("function");
+      expect(typeof configStore.setFontSize).toBe("function");
+      expect(typeof configStore.increaseFontSize).toBe("function");
+      expect(typeof configStore.decreaseFontSize).toBe("function");
+      expect(typeof configStore.resetFontSize).toBe("function");
+      expect(typeof configStore.addAutoGrantedTool).toBe("function");
+      expect(typeof configStore.removeAutoGrantedTool).toBe("function");
+      expect(typeof configStore.getConfig).toBe("function");
+      expect(typeof configStore.toggleStreamerMode).toBe("function");
+      expect(typeof configStore.toggleCompactMode).toBe("function");
+      expect(typeof configStore.setCompactMode).toBe("function");
+    });
+
+    it("has subscribable stores", () => {
+      expect(typeof configStore.config.subscribe).toBe("function");
+      expect(typeof configStore.isLoading.subscribe).toBe("function");
+      expect(typeof configStore.isSidebarOpen.subscribe).toBe("function");
+      expect(typeof configStore.saveError.subscribe).toBe("function");
+    });
+  });
+});

src/lib/stores/config.ts

@@ -2,6 +2,7 @@ import { writable, derived } from "svelte/store";
 import { invoke } from "@tauri-apps/api/core";
 
 export type Theme = "dark" | "light" | "high-contrast" | "custom";
+export type BudgetAction = "warn" | "block";
 
 export interface CustomThemeColors {
   bg_primary: string | null;
@@ -37,6 +38,12 @@ export interface HikariConfig {
   profile_avatar_path: string | null;
   profile_bio: string | null;
   custom_theme_colors: CustomThemeColors;
+  // Budget settings
+  budget_enabled: boolean;
+  session_token_budget: number | null;
+  session_cost_budget: number | null;
+  budget_action: BudgetAction;
+  budget_warning_threshold: number;
 }
 
 const defaultConfig: HikariConfig = {
@@ -71,6 +78,11 @@ const defaultConfig: HikariConfig = {
     text_secondary: null,
     border_color: null,
   },
+  budget_enabled: false,
+  session_token_budget: null,
+  session_cost_budget: null,
+  budget_action: "warn",
+  budget_warning_threshold: 0.8,
 };
 
 function createConfigStore() {