feat: Claude CLI 2.1.50–2.1.53 audit (#171)

## Summary

This PR covers the full audit of Claude CLI changes from 2.1.50 to 2.1.53, plus a batch of bug fixes, new features, and maintenance work identified during that review.

### New Features
- **Workspace trust gate** — detects hooks, MCP servers, and custom commands in a workspace before connecting; persists trust decisions so users aren't prompted repeatedly
- **Custom background image** — users can set a background image with configurable opacity; character panel and compact mode go transparent when active
- **Draggable tab reordering** — conversation tabs can be reordered via pointer-event drag-and-drop (HTML5 drag is intercepted by Tauri/WebView2, so pointer events are used instead)
- **Org UUID in account info** — exposes the org UUID from Claude auth status

### Bug Fixes
- **Unread dot false positives** — initialise unread counts on mount to prevent all tabs showing the blue dot after toggling the file editor (Closes #164)
- **Watchdog for hung WSL bridge** — detects connections that never receive `system:init` and kills the stale process after 1 minute (Closes #166)
- **Suppress terminal window flash on Windows** — applies `CREATE_NO_WINDOW` to all subprocesses via a `HideWindow` trait extension (Closes #165)
- **HTML escaping in markdown renderer** — escape `<` and `>` in `codespan` and `html` renderer callbacks to prevent raw HTML injection (Closes #169)

### Maintenance
- Verify stream-JSON handles tool results above the 50K threshold correctly (Closes #162)
- Reviewed hook security fixes from CLI 2.1.51 — not applicable to our setup (Closes #163)
- Expose org UUID from `claude auth status` (Closes #160)
- Clean up Svelte and Vite build warnings (`a11y_click_events_have_key_events`, `state_referenced_locally`, `non_reactive_update`, `codeSplitting`, chunk size, CodeMirror dynamic import)
- Update all npm dependencies to latest compatible versions with exact pinning (Closes #81, Closes #82, Closes #83, Closes #84, Closes #85, Closes #86, Closes #87, Closes #90, Closes #91, Closes #93, Closes #94, Closes #95, Closes #96, Closes #97, Closes #98, Closes #99, Closes #101, Closes #141, Closes #142, Closes #143, Closes #145, Closes #146, Closes #147)
- Run `cargo update` to bring Cargo.lock up to date

### Closes

Closes #160
Closes #162
Closes #163
Closes #164
Closes #165
Closes #166
Closes #167
Closes #168
Closes #169
Closes #81
Closes #82
Closes #83
Closes #84
Closes #85
Closes #86
Closes #87
Closes #90
Closes #91
Closes #93
Closes #94
Closes #95
Closes #96
Closes #97
Closes #98
Closes #99
Closes #101
Closes #141
Closes #142
Closes #143
Closes #145
Closes #146
Closes #147

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #171
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/lib/components/Markdown.svelte

@@ -35,7 +35,12 @@
   };
 
   renderer.codespan = ({ text }) => {
-    return `<code class="hljs-inline">${text}</code>`;
+    const escaped = text.replace(/</g, "&lt;").replace(/>/g, "&gt;");
+    return `<code class="hljs-inline">${escaped}</code>`;
+  };
+
+  renderer.html = ({ text }) => {
+    return text.replace(/</g, "&lt;").replace(/>/g, "&gt;");
   };
 
   marked.setOptions({