release: v1.10.0

feat: multiple UI improvements, font settings, and memory file display names (#175 )
## Summary - **fix**: `show_thinking_blocks` setting now persists across sessions — it was defined on the TypeScript side but missing from the Rust `HikariConfig` struct, so serde silently dropped it on every save/load - **feat**: Tool calls are now rendered as collapsible blocks matching the Extended Thinking block aesthetic, replacing the old inline dropdown approach - **feat**: Add configurable max output tokens setting - **feat**: Use random creative names for conversation tabs - **test**: Significantly expanded frontend unit test coverage - **docs**: Require tests for all changes in CLAUDE.md - **feat**: Allow users to specify a custom terminal font (Closes #176) - **feat**: Display friendly names for memory files derived from the first heading (Closes #177) - **feat**: Add custom UI font support for the app chrome (buttons, labels, tabs) - **fix**: Apply custom UI font to the full app interface — `.app-container` was hardcoded, blocking inheritance from `body`; also renamed "Custom Font" to "Custom Terminal Font" for clarity ✨ This PR was created with help from Hikari~ 🌸 Reviewed-on: #175 Co-authored-by: Hikari <hikari@nhcarrigan.com> Co-committed-by: Hikari <hikari@nhcarrigan.com>
2026-03-03 20:22:54 -08:00 · 2026-03-03 20:21:58 -08:00
21 changed files with 1655 additions and 38 deletions
@@ -39,7 +39,7 @@ git push https://hikari:TOKEN@git.nhcarrigan.com/nhcarrigan/hikari-desktop.git <

 ## Testing Requirements

-All new features, fixes, and significant changes should include tests whenever possible:
+**All changes MUST include tests.** This is non-negotiable — no feature, bug fix, or refactor should be committed without corresponding test coverage. If a change cannot be tested (e.g. pure UI layout, Tauri IPC calls that are impossible to mock), document why in a comment.

 - **Frontend tests**: Use Vitest with `@testing-library/svelte` for component tests
 - **Test files**: Place test files next to the code they test with `.test.ts` or `.spec.ts` extension
@@ -137,16 +137,16 @@ describe("FeatureName", () => {
 });
 ```

-### Adding Tests for New Features
+### Adding Tests for All Changes

-When developing new features, always add corresponding tests:
+Every change — features, bug fixes, refactors — must include tests:

 1. **Before implementing**: Consider what needs testing (happy path, edge cases, errors)
 2. **During implementation**: Write tests alongside the code
 3. **After implementation**: Run `pnpm test:coverage` to verify coverage remains high
 4. **Before committing**: Ensure `check-all.sh` passes (includes all tests)

-The goal is to maintain our near-100% coverage as the codebase grows, so future refactoring and changes can be made with confidence!
+**Do not commit changes without tests.** The goal is to maintain near-100% coverage as the codebase grows, so future refactoring can be done with confidence!

 ## Quality Assurance

@@ -1,6 +1,6 @@
 {
  "name": "hikari-desktop",
-  "version": "1.9.0",
+  "version": "1.10.0",
  "description": "",
  "type": "module",
  "scripts": {
@@ -1648,7 +1648,7 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"

 [[package]]
 name = "hikari-desktop"
-version = "1.9.0"
+version = "1.10.0"
 dependencies = [
 "chrono",
 "dirs 5.0.1",
@@ -1,6 +1,6 @@
 [package]
 name = "hikari-desktop"
-version = "1.9.0"
+version = "1.10.0"
 description = "Hikari - Claude Code Visual Assistant"
 authors = ["Naomi Carrigan"]
 edition = "2021"
@@ -862,6 +862,26 @@ pub async fn read_file_content(path: String) -> Result<String, String> {
        .map_err(|e| format!("Failed to read file: {}", e))
 }

+/// Read the first `# Heading` from a WSL file path (for Windows).
+/// Returns `None` if the file cannot be read or has no top-level heading.
+#[cfg(target_os = "windows")]
+fn read_wsl_file_first_heading(path: &str) -> Option<String> {
+    use std::process::Command;
+
+    let output = Command::new("wsl")
+        .hide_window()
+        .args(["-e", "bash", "-c", &format!("head -20 '{}'", path)])
+        .output()
+        .ok()?;
+
+    if !output.status.success() {
+        return None;
+    }
+
+    let content = String::from_utf8_lossy(&output.stdout);
+    extract_first_heading(&content)
+}
+
 /// Read file content via WSL (for Windows with WSL paths)
 #[allow(dead_code)]
 async fn read_file_via_wsl(path: &str) -> Result<String, String> {
@@ -1353,9 +1373,29 @@ pub async fn close_application(app_handle: AppHandle) -> Result<(), String> {
    Ok(())
 }

+#[derive(serde::Serialize)]
+pub struct MemoryFileInfo {
+    pub path: String,
+    pub heading: Option<String>,
+}
+
 #[derive(serde::Serialize)]
 pub struct MemoryFilesResponse {
-    pub files: Vec<String>,
+    pub files: Vec<MemoryFileInfo>,
+}
+
+/// Extract the first `# Heading` from a string of file content.
+fn extract_first_heading(content: &str) -> Option<String> {
+    content.lines().find_map(|line| {
+        let trimmed = line.trim();
+        if let Some(rest) = trimmed.strip_prefix("# ") {
+            let heading = rest.trim().to_string();
+            if !heading.is_empty() {
+                return Some(heading);
+            }
+        }
+        None
+    })
 }

 #[tauri::command]
@@ -1398,12 +1438,19 @@ async fn list_memory_files_via_wsl() -> Result<MemoryFilesResponse, String> {
    }

    let stdout = String::from_utf8_lossy(&output.stdout);
-    let files: Vec<String> = stdout
+    let paths: Vec<String> = stdout
        .lines()
        .filter(|line| !line.trim().is_empty())
        .map(|line| line.trim().to_string())
        .collect();

+    // Read first heading from each file via WSL
+    let mut files = Vec::new();
+    for path in paths {
+        let heading = read_wsl_file_first_heading(&path);
+        files.push(MemoryFileInfo { path, heading });
+    }
+
    Ok(MemoryFilesResponse { files })
 }

@@ -1425,10 +1472,13 @@ async fn list_memory_files_native() -> Result<MemoryFilesResponse, String> {
        return Ok(MemoryFilesResponse { files: Vec::new() });
    }

-    let mut memory_files = Vec::new();
+    let mut memory_paths = Vec::new();

    // Recursively find all memory directories
-    fn find_memory_files(dir: &std::path::Path, files: &mut Vec<String>) -> std::io::Result<()> {
+    fn find_memory_files(
+        dir: &std::path::Path,
+        files: &mut Vec<String>,
+    ) -> std::io::Result<()> {
        if !dir.is_dir() {
            return Ok(());
        }
@@ -1461,16 +1511,25 @@ async fn list_memory_files_native() -> Result<MemoryFilesResponse, String> {
        Ok(())
    }

-    if let Err(e) = find_memory_files(&projects_dir, &mut memory_files) {
+    if let Err(e) = find_memory_files(&projects_dir, &mut memory_paths) {
        return Err(format!("Failed to list memory files: {}", e));
    }

    // Sort files alphabetically
-    memory_files.sort();
+    memory_paths.sort();

-    Ok(MemoryFilesResponse {
-        files: memory_files,
-    })
+    // Read first heading from each file
+    let files = memory_paths
+        .into_iter()
+        .map(|path| {
+            let heading = fs::read_to_string(&path)
+                .ok()
+                .and_then(|content| extract_first_heading(&content));
+            MemoryFileInfo { path, heading }
+        })
+        .collect();
+
+    Ok(MemoryFilesResponse { files })
 }

 #[tauri::command]
@@ -2902,4 +2961,65 @@ gitea: gitea-mcp -t stdio (STDIO) - ✓ Connected"#;
        assert_eq!(servers[0].name, "asana");
        assert_eq!(servers[1].name, "gitea");
    }
+
+    // ==================== extract_first_heading tests ====================
+
+    #[test]
+    fn test_extract_first_heading_returns_heading() {
+        let content = "# My Memory File\n\nSome content here.";
+        assert_eq!(
+            extract_first_heading(content),
+            Some("My Memory File".to_string())
+        );
+    }
+
+    #[test]
+    fn test_extract_first_heading_ignores_non_h1() {
+        let content = "## Section Header\n### Sub-section\nSome content.";
+        assert_eq!(extract_first_heading(content), None);
+    }
+
+    #[test]
+    fn test_extract_first_heading_finds_first_h1_after_other_lines() {
+        let content = "Some intro text\n\n# The Real Title\n\nMore content.";
+        assert_eq!(
+            extract_first_heading(content),
+            Some("The Real Title".to_string())
+        );
+    }
+
+    #[test]
+    fn test_extract_first_heading_trims_whitespace() {
+        let content = "#   Trimmed Heading   \n\nContent.";
+        assert_eq!(
+            extract_first_heading(content),
+            Some("Trimmed Heading".to_string())
+        );
+    }
+
+    #[test]
+    fn test_extract_first_heading_returns_none_for_empty_content() {
+        assert_eq!(extract_first_heading(""), None);
+    }
+
+    #[test]
+    fn test_extract_first_heading_returns_none_for_empty_heading() {
+        let content = "# \n\nContent after empty heading.";
+        assert_eq!(extract_first_heading(content), None);
+    }
+
+    #[test]
+    fn test_extract_first_heading_returns_none_when_no_headings() {
+        let content = "Just some plain text.\nNo headings here at all.";
+        assert_eq!(extract_first_heading(content), None);
+    }
+
+    #[test]
+    fn test_extract_first_heading_handles_leading_whitespace_on_line() {
+        let content = "   # Indented Heading\n\nContent.";
+        assert_eq!(
+            extract_first_heading(content),
+            Some("Indented Heading".to_string())
+        );
+    }
 }
@@ -144,6 +144,20 @@ pub struct HikariConfig {

    #[serde(default)]
    pub show_thinking_blocks: bool,
+
+    // Custom terminal font settings
+    #[serde(default)]
+    pub custom_font_path: Option<String>,
+
+    #[serde(default)]
+    pub custom_font_family: Option<String>,
+
+    // Custom UI font settings
+    #[serde(default)]
+    pub custom_ui_font_path: Option<String>,
+
+    #[serde(default)]
+    pub custom_ui_font_family: Option<String>,
 }

 impl Default for HikariConfig {
@@ -183,6 +197,10 @@ impl Default for HikariConfig {
            background_image_path: None,
            background_image_opacity: 0.3,
            show_thinking_blocks: false,
+            custom_font_path: None,
+            custom_font_family: None,
+            custom_ui_font_path: None,
+            custom_ui_font_family: None,
        }
    }
 }
@@ -298,6 +316,10 @@ mod tests {
        assert!(!config.disable_1m_context);
        assert!(config.trusted_workspaces.is_empty());
        assert!(!config.show_thinking_blocks);
+        assert!(config.custom_font_path.is_none());
+        assert!(config.custom_font_family.is_none());
+        assert!(config.custom_ui_font_path.is_none());
+        assert!(config.custom_ui_font_family.is_none());
    }

    #[test]
@@ -337,6 +359,10 @@ mod tests {
            background_image_path: Some("/home/naomi/bg.png".to_string()),
            background_image_opacity: 0.25,
            show_thinking_blocks: true,
+            custom_font_path: Some("/home/naomi/.fonts/MyFont.ttf".to_string()),
+            custom_font_family: Some("MyFont".to_string()),
+            custom_ui_font_path: None,
+            custom_ui_font_family: None,
        };

        let json = serde_json::to_string(&config).unwrap();
@@ -1,7 +1,7 @@
 {
  "$schema": "https://schema.tauri.app/config/2",
  "productName": "hikari-desktop",
-  "version": "1.9.0",
+  "version": "1.10.0",
  "identifier": "com.naomi.hikari-desktop",
  "build": {
    "beforeDevCommand": "pnpm dev",
@@ -154,11 +154,7 @@ body {
  padding: 0;
  height: 100%;
  overflow: hidden;
-  font-family:
-    "Segoe UI",
-    system-ui,
-    -apple-system,
-    sans-serif;
+  font-family: var(--ui-font-family, "Segoe UI", system-ui, -apple-system, sans-serif);
  background: var(--bg-primary);
  color: var(--text-primary);
 }
@@ -5,6 +5,8 @@
    type Theme,
    type CustomThemeColors,
    applyFontSize,
+    applyCustomFont,
+    applyCustomUiFont,
    applyCustomThemeColors,
    MIN_FONT_SIZE,
    MAX_FONT_SIZE,
@@ -60,9 +62,19 @@
    trusted_workspaces: [],
    background_image_path: null,
    background_image_opacity: 0.3,
+    custom_font_path: null,
+    custom_font_family: null,
+    custom_ui_font_path: null,
+    custom_ui_font_family: null,
  });

  let showCustomThemeEditor = $state(false);
+  let customFontPathInput = $state("");
+  let customFontFamilyInput = $state("");
+  let customFontStatus: string | null = $state(null);
+  let customUiFontPathInput = $state("");
+  let customUiFontFamilyInput = $state("");
+  let customUiFontStatus: string | null = $state(null);

  interface AuthStatus {
    is_logged_in: boolean;
@@ -88,6 +100,10 @@

  configStore.config.subscribe((c) => {
    config = { ...c };
+    customFontPathInput = c.custom_font_path ?? "";
+    customFontFamilyInput = c.custom_font_family ?? "";
+    customUiFontPathInput = c.custom_ui_font_path ?? "";
+    customUiFontFamilyInput = c.custom_ui_font_family ?? "";
  });

  configStore.isSidebarOpen.subscribe((open) => {
@@ -937,6 +953,130 @@
        </p>
      </div>

+      <!-- Custom Terminal Font -->
+      <div class="mb-4">
+        <span class="block text-sm text-[var(--text-secondary)] mb-2">Custom Terminal Font</span>
+        <div class="flex flex-col gap-2">
+          <input
+            type="text"
+            bind:value={customFontPathInput}
+            placeholder="URL or local file path (e.g. /path/to/font.ttf)"
+            class="w-full px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-primary)] placeholder-gray-500 focus:outline-none focus:border-[var(--accent-primary)]"
+          />
+          <input
+            type="text"
+            bind:value={customFontFamilyInput}
+            placeholder="Font family name (e.g. FiraCode)"
+            class="w-full px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-primary)] placeholder-gray-500 focus:outline-none focus:border-[var(--accent-primary)]"
+          />
+          <div class="flex gap-2">
+            <button
+              onclick={async () => {
+                customFontStatus = null;
+                try {
+                  await configStore.setCustomFont(
+                    customFontPathInput || null,
+                    customFontFamilyInput || null
+                  );
+                  customFontStatus = "Font applied!";
+                } catch (e) {
+                  customFontStatus = `Error: ${e instanceof Error ? e.message : String(e)}`;
+                }
+              }}
+              class="flex-1 px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-secondary)] hover:border-[var(--accent-primary)] transition-colors"
+            >
+              Apply
+            </button>
+            <button
+              onclick={async () => {
+                customFontStatus = null;
+                customFontPathInput = "";
+                customFontFamilyInput = "";
+                try {
+                  await configStore.setCustomFont(null, null);
+                  await applyCustomFont(null, null);
+                  customFontStatus = "Font reset to default.";
+                } catch (e) {
+                  customFontStatus = `Error: ${e instanceof Error ? e.message : String(e)}`;
+                }
+              }}
+              class="px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-secondary)] hover:border-red-400 hover:text-red-400 transition-colors"
+            >
+              Reset
+            </button>
+          </div>
+          {#if customFontStatus}
+            <p class="text-xs text-[var(--text-tertiary)]">{customFontStatus}</p>
+          {/if}
+        </div>
+        <p class="text-xs text-[var(--text-tertiary)] mt-1">
+          Supports Google Fonts URLs, direct font file URLs, or local file paths. Family name is
+          required to apply the font.
+        </p>
+      </div>
+
+      <!-- Custom UI Font -->
+      <div class="mb-4">
+        <span class="block text-sm text-[var(--text-secondary)] mb-2">Custom UI Font</span>
+        <div class="flex flex-col gap-2">
+          <input
+            type="text"
+            bind:value={customUiFontPathInput}
+            placeholder="URL or local file path (e.g. /path/to/font.ttf)"
+            class="w-full px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-primary)] placeholder-gray-500 focus:outline-none focus:border-[var(--accent-primary)]"
+          />
+          <input
+            type="text"
+            bind:value={customUiFontFamilyInput}
+            placeholder="Font family name (e.g. Inter)"
+            class="w-full px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-primary)] placeholder-gray-500 focus:outline-none focus:border-[var(--accent-primary)]"
+          />
+          <div class="flex gap-2">
+            <button
+              onclick={async () => {
+                customUiFontStatus = null;
+                try {
+                  await configStore.setCustomUiFont(
+                    customUiFontPathInput || null,
+                    customUiFontFamilyInput || null
+                  );
+                  customUiFontStatus = "Font applied!";
+                } catch (e) {
+                  customUiFontStatus = `Error: ${e instanceof Error ? e.message : String(e)}`;
+                }
+              }}
+              class="flex-1 px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-secondary)] hover:border-[var(--accent-primary)] transition-colors"
+            >
+              Apply UI Font
+            </button>
+            <button
+              onclick={async () => {
+                customUiFontStatus = null;
+                customUiFontPathInput = "";
+                customUiFontFamilyInput = "";
+                try {
+                  await configStore.setCustomUiFont(null, null);
+                  await applyCustomUiFont(null, null);
+                  customUiFontStatus = "Font reset to default.";
+                } catch (e) {
+                  customUiFontStatus = `Error: ${e instanceof Error ? e.message : String(e)}`;
+                }
+              }}
+              class="px-3 py-2 text-sm rounded-lg border border-[var(--border-color)] bg-[var(--bg-primary)] text-[var(--text-secondary)] hover:border-red-400 hover:text-red-400 transition-colors"
+            >
+              Reset
+            </button>
+          </div>
+          {#if customUiFontStatus}
+            <p class="text-xs text-[var(--text-tertiary)]">{customUiFontStatus}</p>
+          {/if}
+        </div>
+        <p class="text-xs text-[var(--text-tertiary)] mt-1">
+          Applies to the entire app interface (menus, labels, buttons). Supports Google Fonts URLs,
+          direct font file URLs, or local file paths.
+        </p>
+      </div>
+
      <!-- Show Thinking Blocks Toggle -->
      <div class="mb-4">
        <label class="flex items-center gap-3 cursor-pointer">
@@ -1011,7 +1011,7 @@ User: ${formattedMessage}`;
          : "Connect to Claude first..."}
        disabled={isSubmitting}
        rows={1}
-        style="height: {textareaHeight}px; font-size: var(--terminal-font-size, 14px);"
+        style="height: {textareaHeight}px; font-size: var(--terminal-font-size, 14px); font-family: var(--terminal-font-family, monospace);"
        class="w-full px-4 py-3 bg-[var(--bg-secondary)] border border-[var(--border-color)]
             rounded-lg text-[var(--text-primary)] placeholder-gray-500 resize-none
             input-trans-focus disabled:opacity-50 disabled:cursor-not-allowed"
@@ -3,17 +3,22 @@
  import { invoke } from "@tauri-apps/api/core";
  import Markdown from "./Markdown.svelte";

-  let memoryFiles: string[] = $state([]);
+  interface MemoryFileInfo {
+    path: string;
+    heading: string | null;
+  }
+
+  interface MemoryFilesResponse {
+    files: MemoryFileInfo[];
+  }
+
+  let memoryFiles: MemoryFileInfo[] = $state([]);
  let selectedFile: string | null = $state(null);
  let fileContent: string = $state("");
  let isLoading = $state(false);
  let error: string | null = $state(null);
  let isPanelOpen = $state(false);

-  interface MemoryFilesResponse {
-    files: string[];
-  }
-
  async function loadMemoryFiles() {
    isLoading = true;
    error = null;
@@ -49,6 +54,10 @@
    return path.split("/").pop() || path;
  }

+  function getDisplayName(file: MemoryFileInfo): string {
+    return file.heading ?? getFileName(file.path);
+  }
+
  function togglePanel() {
    isPanelOpen = !isPanelOpen;
    if (isPanelOpen && memoryFiles.length === 0) {
@@ -151,11 +160,12 @@
      {:else}
        <div class="panel-layout">
          <div class="file-list">
-            {#each memoryFiles as file (file)}
+            {#each memoryFiles as file (file.path)}
              <button
                class="file-item"
-                class:active={selectedFile === file}
-                onclick={() => loadFileContent(file)}
+                class:active={selectedFile === file.path}
+                onclick={() => loadFileContent(file.path)}
+                title={getFileName(file.path)}
              >
                <svg
                  class="file-icon"
@@ -171,7 +181,7 @@
                    d="M9 12h6m-6 4h6m2 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>
-                <span class="file-name">{getFileName(file)}</span>
+                <span class="file-name">{getDisplayName(file)}</span>
              </button>
            {/each}
          </div>
@@ -179,7 +189,12 @@
          <div class="file-viewer">
            {#if selectedFile && fileContent}
              <div class="viewer-header">
-                <h4>{getFileName(selectedFile)}</h4>
+                {#each memoryFiles.filter((f) => f.path === selectedFile) as activeFile (activeFile.path)}
+                  <h4>{getDisplayName(activeFile)}</h4>
+                  {#if activeFile.heading}
+                    <p class="viewer-filename">{getFileName(activeFile.path)}</p>
+                  {/if}
+                {/each}
              </div>
              <div class="viewer-content">
                <Markdown content={fileContent} />
@@ -438,6 +453,13 @@
    color: var(--text-primary);
  }

+  .viewer-filename {
+    margin: 0.25rem 0 0;
+    font-size: 0.75rem;
+    color: var(--text-tertiary);
+    font-family: monospace;
+  }
+
  .viewer-content {
    flex: 1;
    padding: 1.5rem;
@@ -0,0 +1,98 @@
+import { describe, it, expect } from "vitest";
+
+// Mirror pure logic functions from MemoryBrowserPanel.svelte
+
+interface MemoryFileInfo {
+  path: string;
+  heading: string | null;
+}
+
+function getFileName(path: string): string {
+  return path.split("/").pop() || path;
+}
+
+function getDisplayName(file: MemoryFileInfo): string {
+  return file.heading ?? getFileName(file.path);
+}
+
+describe("getFileName", () => {
+  it("extracts the filename from an absolute Unix path", () => {
+    expect(getFileName("/home/naomi/.claude/projects/foo/memory/MEMORY.md")).toBe("MEMORY.md");
+  });
+
+  it("extracts the filename from a nested path", () => {
+    expect(getFileName("/home/naomi/.claude/projects/foo/memory/debugging.md")).toBe(
+      "debugging.md"
+    );
+  });
+
+  it("returns the path itself when there is no slash", () => {
+    expect(getFileName("MEMORY.md")).toBe("MEMORY.md");
+  });
+
+  it("returns the path when the path ends with a slash (empty filename)", () => {
+    // split('/').pop() returns '' for trailing slash → falls back to full path
+    expect(getFileName("/some/dir/")).toBe("/some/dir/");
+  });
+
+  it("handles single-component paths", () => {
+    expect(getFileName("notes.md")).toBe("notes.md");
+  });
+
+  it("handles Windows-style paths passed as Unix strings", () => {
+    // If the path contains no forward slashes, the whole string is the filename
+    expect(getFileName("C:\\Users\\naomi\\memory\\file.md")).toBe(
+      "C:\\Users\\naomi\\memory\\file.md"
+    );
+  });
+});
+
+describe("getDisplayName", () => {
+  it("returns the heading when the file has one", () => {
+    const file: MemoryFileInfo = {
+      path: "/home/naomi/.claude/projects/foo/memory/MEMORY.md",
+      heading: "Hikari Desktop - Memory",
+    };
+    expect(getDisplayName(file)).toBe("Hikari Desktop - Memory");
+  });
+
+  it("falls back to the filename when heading is null", () => {
+    const file: MemoryFileInfo = {
+      path: "/home/naomi/.claude/projects/foo/memory/debugging.md",
+      heading: null,
+    };
+    expect(getDisplayName(file)).toBe("debugging.md");
+  });
+
+  it("falls back to the filename when heading is an empty string stored as null", () => {
+    const file: MemoryFileInfo = {
+      path: "/home/naomi/.claude/projects/foo/memory/patterns.md",
+      heading: null,
+    };
+    expect(getDisplayName(file)).toBe("patterns.md");
+  });
+
+  it("returns the heading even when it matches the filename", () => {
+    const file: MemoryFileInfo = {
+      path: "/home/naomi/.claude/projects/foo/memory/MEMORY.md",
+      heading: "MEMORY",
+    };
+    expect(getDisplayName(file)).toBe("MEMORY");
+  });
+
+  it("returns a multi-word heading verbatim", () => {
+    const file: MemoryFileInfo = {
+      path: "/some/path/foo.md",
+      heading: "My Detailed Debugging Notes",
+    };
+    expect(getDisplayName(file)).toBe("My Detailed Debugging Notes");
+  });
+
+  it("falls back gracefully when path has no directory separators", () => {
+    const file: MemoryFileInfo = {
+      path: "lonely-file.md",
+      heading: null,
+    };
+    expect(getDisplayName(file)).toBe("lonely-file.md");
+  });
+});
@@ -111,6 +111,10 @@
    trusted_workspaces: [],
    background_image_path: null,
    background_image_opacity: 0.3,
+    custom_font_path: null,
+    custom_font_family: null,
+    custom_ui_font_path: null,
+    custom_ui_font_family: null,
  });

  let streamerModeActive = $state(false);
@@ -231,7 +231,7 @@
    bind:this={terminalElement}
    onscroll={handleScroll}
    class="terminal-content h-[calc(100%-76px)] overflow-y-auto p-4 font-mono"
-    style="font-size: var(--terminal-font-size, 14px);"
+    style="font-size: var(--terminal-font-size, 14px); font-family: var(--terminal-font-family, monospace);"
  >
    {#if lines.length === 0}
      <div class="terminal-waiting italic">
@@ -552,6 +552,48 @@ describe("clipboardStore - store actions", () => {
      expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to toggle pin:", expect.any(Error));
      consoleErrorSpy.mockRestore();
    });
+
+    it("exercises the unpinned-before-pinned sort branch", async () => {
+      // Three entries so sort compares (entry-1 unpinned, entry-2 pinned) — hits line 144
+      const e1 = { ...mockEntry, id: "e1", is_pinned: false };
+      const e2 = { ...mockEntry, id: "e2", is_pinned: false };
+      const e3 = { ...mockEntry, id: "e3", is_pinned: false };
+      clipboardStore.entries.set([e1, e2, e3]);
+      const pinned = { ...e2, is_pinned: true };
+      setMockInvokeResult("toggle_pin_clipboard_entry", pinned);
+      await clipboardStore.togglePin("e2");
+      expect(get(clipboardStore.entries)[0].id).toBe("e2");
+    });
+
+    it("sorts same-pin-status entries by timestamp descending", async () => {
+      // Toggle entry to pinned while two others remain unpinned — sort compares unpinned pair by timestamp
+      const older = {
+        ...mockEntry,
+        id: "older",
+        is_pinned: false,
+        timestamp: "2026-01-01T00:00:00.000Z",
+      };
+      const newer = {
+        ...mockEntry,
+        id: "newer",
+        is_pinned: false,
+        timestamp: "2026-01-02T00:00:00.000Z",
+      };
+      const pinned = {
+        ...mockEntry,
+        id: "pinned",
+        is_pinned: false,
+        timestamp: "2026-01-03T00:00:00.000Z",
+      };
+      clipboardStore.entries.set([older, newer, pinned]);
+      const pinnedResult = { ...pinned, is_pinned: true };
+      setMockInvokeResult("toggle_pin_clipboard_entry", pinnedResult);
+      await clipboardStore.togglePin("pinned");
+      const entries = get(clipboardStore.entries);
+      expect(entries[0].id).toBe("pinned");
+      expect(entries[1].id).toBe("newer");
+      expect(entries[2].id).toBe("older");
+    });
  });

  describe("clearHistory", () => {
@@ -587,6 +629,16 @@ describe("clipboardStore - store actions", () => {
      expect(get(clipboardStore.entries)[0].language).toBe("javascript");
    });

+    it("leaves non-matching entries unchanged", async () => {
+      const other = { ...mockEntry, id: "other", language: "python" };
+      clipboardStore.entries.set([mockEntry, other]);
+      const updated = { ...mockEntry, language: "javascript" };
+      setMockInvokeResult("update_clipboard_language", updated);
+      await clipboardStore.updateLanguage("entry-1", "javascript");
+      const entries = get(clipboardStore.entries);
+      expect(entries[1].language).toBe("python");
+    });
+
    it("handles errors gracefully", async () => {
      const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
      setMockInvokeResult("update_clipboard_language", new Error("Failed"));
@@ -5,6 +5,8 @@ import {
  maskPaths,
  clampFontSize,
  applyFontSize,
+  applyCustomFont,
+  applyCustomUiFont,
  applyTheme,
  applyCustomThemeColors,
  clearCustomThemeColors,
@@ -21,12 +23,17 @@ import {
  type CustomThemeColors,
 } from "./config";
 import { invoke } from "@tauri-apps/api/core";
+import { readFile } from "@tauri-apps/plugin-fs";

 // Mock Tauri APIs
 vi.mock("@tauri-apps/api/core", () => ({
  invoke: vi.fn(),
 }));

+vi.mock("@tauri-apps/plugin-fs", () => ({
+  readFile: vi.fn(),
+}));
+
 describe("config store", () => {
  describe("font size constants", () => {
    it("has correct MIN_FONT_SIZE", () => {
@@ -206,6 +213,10 @@ describe("config store", () => {
        trusted_workspaces: [],
        background_image_path: null,
        background_image_opacity: 0.3,
+        custom_font_path: null,
+        custom_font_family: null,
+        custom_ui_font_path: null,
+        custom_ui_font_family: null,
      };

      expect(config.model).toBe("claude-sonnet-4");
@@ -258,6 +269,10 @@ describe("config store", () => {
        trusted_workspaces: [],
        background_image_path: null,
        background_image_opacity: 0.3,
+        custom_font_path: null,
+        custom_font_family: null,
+        custom_ui_font_path: null,
+        custom_ui_font_family: null,
      };

      expect(config.model).toBeNull();
@@ -809,6 +824,10 @@ describe("config store", () => {
        trusted_workspaces: [],
        background_image_path: null,
        background_image_opacity: 0.3,
+        custom_font_path: null,
+        custom_font_family: null,
+        custom_ui_font_path: null,
+        custom_ui_font_family: null,
      };

      const mockInvokeImpl = vi.mocked(invoke);
@@ -1133,4 +1152,323 @@ describe("config store", () => {
      expect(get(showThinkingBlocks)).toBe(false);
    });
  });
+
+  describe("applyCustomFont", () => {
+    const readFileMock = vi.mocked(readFile);
+
+    beforeEach(() => {
+      // Remove any style element left by previous tests
+      document.getElementById("hikari-custom-font")?.remove();
+      document.documentElement.style.removeProperty("--terminal-font-family");
+      readFileMock.mockReset();
+    });
+
+    it("removes CSS variable when both path and family are null", async () => {
+      document.documentElement.style.setProperty("--terminal-font-family", "'SomeFont', monospace");
+      await applyCustomFont(null, null);
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe("");
+    });
+
+    it("removes CSS variable when both path and family are empty strings", async () => {
+      document.documentElement.style.setProperty("--terminal-font-family", "'SomeFont', monospace");
+      await applyCustomFont("", "");
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe("");
+      expect(document.getElementById("hikari-custom-font")).toBeNull();
+    });
+
+    it("injects @import for a CSS stylesheet URL", async () => {
+      await applyCustomFont("https://fonts.googleapis.com/css2?family=Fira+Code", "Fira Code");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style).not.toBeNull();
+      expect(style?.textContent).toContain(
+        "@import url('https://fonts.googleapis.com/css2?family=Fira+Code')"
+      );
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe(
+        "'Fira Code', monospace"
+      );
+    });
+
+    it("injects @font-face for a direct font file URL (.woff2)", async () => {
+      await applyCustomFont("https://example.com/fonts/myfont.woff2", "MyFont");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style).not.toBeNull();
+      expect(style?.textContent).toContain("@font-face");
+      expect(style?.textContent).toContain("url('https://example.com/fonts/myfont.woff2')");
+      expect(style?.textContent).toContain("'MyFont'");
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe(
+        "'MyFont', monospace"
+      );
+    });
+
+    it("injects @font-face for a direct font file URL (.ttf)", async () => {
+      await applyCustomFont("https://example.com/fonts/myfont.ttf", "MyTtfFont");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style).not.toBeNull();
+      expect(style?.textContent).toContain("@font-face");
+      expect(style?.textContent).toContain("url('https://example.com/fonts/myfont.ttf')");
+      expect(style?.textContent).toContain("'MyTtfFont'");
+    });
+
+    it("uses HikariCustomFont as fallback family for direct font URLs when family is empty", async () => {
+      await applyCustomFont("https://example.com/fonts/myfont.woff2", "");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style?.textContent).toContain("'HikariCustomFont'");
+    });
+
+    it("reads local file and injects @font-face with data URL", async () => {
+      const fakeData = new Uint8Array([72, 101, 108, 108, 111]); // "Hello"
+      readFileMock.mockResolvedValueOnce(fakeData);
+
+      await applyCustomFont("/home/naomi/.fonts/MyFont.ttf", "MyFont");
+
+      expect(readFileMock).toHaveBeenCalledWith("/home/naomi/.fonts/MyFont.ttf");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style).not.toBeNull();
+      expect(style?.textContent).toContain("@font-face");
+      expect(style?.textContent).toContain("data:font/ttf;base64,");
+      expect(style?.textContent).toContain("'MyFont'");
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe(
+        "'MyFont', monospace"
+      );
+    });
+
+    it("uses HikariCustomFont as fallback family for local files when family is empty", async () => {
+      const fakeData = new Uint8Array([1, 2, 3]);
+      readFileMock.mockResolvedValueOnce(fakeData);
+
+      await applyCustomFont("/home/naomi/.fonts/MyFont.woff2", "");
+
+      const style = document.getElementById("hikari-custom-font");
+      expect(style?.textContent).toContain("'HikariCustomFont'");
+      expect(style?.textContent).toContain("font/woff2");
+    });
+
+    it("sets CSS variable when only family is provided (no path)", async () => {
+      await applyCustomFont("", "SystemFont");
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe(
+        "'SystemFont', monospace"
+      );
+      expect(document.getElementById("hikari-custom-font")).toBeNull();
+    });
+
+    it("replaces a previously injected style element", async () => {
+      await applyCustomFont("https://fonts.googleapis.com/css2?family=Fira+Code", "Fira Code");
+      expect(document.getElementById("hikari-custom-font")).not.toBeNull();
+
+      await applyCustomFont("https://fonts.googleapis.com/css2?family=Roboto+Mono", "Roboto Mono");
+      const styles = document.querySelectorAll("#hikari-custom-font");
+      expect(styles.length).toBe(1);
+      expect(styles[0].textContent).toContain("Roboto+Mono");
+    });
+
+    it("uses correct MIME type for .otf local files", async () => {
+      readFileMock.mockResolvedValueOnce(new Uint8Array([1]));
+      await applyCustomFont("/fonts/MyFont.otf", "OtfFont");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style?.textContent).toContain("font/otf");
+    });
+
+    it("falls back to font/ttf MIME for unknown extension local files", async () => {
+      readFileMock.mockResolvedValueOnce(new Uint8Array([1]));
+      await applyCustomFont("/fonts/MyFont.xyz", "XyzFont");
+      const style = document.getElementById("hikari-custom-font");
+      expect(style?.textContent).toContain("font/ttf");
+    });
+  });
+
+  describe("setCustomFont", () => {
+    const readFileMock = vi.mocked(readFile);
+    const invokeMock = vi.mocked(invoke);
+
+    beforeEach(() => {
+      document.getElementById("hikari-custom-font")?.remove();
+      document.documentElement.style.removeProperty("--terminal-font-family");
+      readFileMock.mockReset();
+      invokeMock.mockResolvedValue(undefined);
+    });
+
+    it("saves config and applies the font", async () => {
+      await configStore.setCustomFont(null, null);
+      await configStore.setCustomFont(
+        "https://fonts.googleapis.com/css2?family=Fira+Code",
+        "Fira Code"
+      );
+
+      expect(invokeMock).toHaveBeenCalledWith(
+        "save_config",
+        expect.objectContaining({
+          config: expect.objectContaining({
+            custom_font_path: "https://fonts.googleapis.com/css2?family=Fira+Code",
+            custom_font_family: "Fira Code",
+          }),
+        })
+      );
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe(
+        "'Fira Code', monospace"
+      );
+    });
+
+    it("clears font when called with nulls", async () => {
+      document.documentElement.style.setProperty("--terminal-font-family", "'SomeFont', monospace");
+      await configStore.setCustomFont(null, null);
+
+      expect(document.documentElement.style.getPropertyValue("--terminal-font-family")).toBe("");
+      expect(invokeMock).toHaveBeenCalledWith(
+        "save_config",
+        expect.objectContaining({
+          config: expect.objectContaining({
+            custom_font_path: null,
+            custom_font_family: null,
+          }),
+        })
+      );
+    });
+  });
+
+  describe("applyCustomUiFont", () => {
+    const readFileMock = vi.mocked(readFile);
+
+    beforeEach(() => {
+      document.getElementById("hikari-custom-ui-font")?.remove();
+      document.documentElement.style.removeProperty("--ui-font-family");
+      document.body.style.removeProperty("font-family");
+      readFileMock.mockReset();
+    });
+
+    it("removes CSS variable and body font-family when both path and family are null", async () => {
+      document.documentElement.style.setProperty("--ui-font-family", "'SomeFont', sans-serif");
+      document.body.style.setProperty("font-family", "'SomeFont', sans-serif");
+      await applyCustomUiFont(null, null);
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe("");
+      expect(document.body.style.getPropertyValue("font-family")).toBe("");
+    });
+
+    it("removes CSS variable and body font-family when both path and family are empty strings", async () => {
+      document.documentElement.style.setProperty("--ui-font-family", "'SomeFont', sans-serif");
+      document.body.style.setProperty("font-family", "'SomeFont', sans-serif");
+      await applyCustomUiFont("", "");
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe("");
+      expect(document.body.style.getPropertyValue("font-family")).toBe("");
+      expect(document.getElementById("hikari-custom-ui-font")).toBeNull();
+    });
+
+    it("injects @import for a CSS stylesheet URL and applies font to body", async () => {
+      await applyCustomUiFont("https://fonts.googleapis.com/css2?family=Inter", "Inter");
+      const style = document.getElementById("hikari-custom-ui-font");
+      expect(style).not.toBeNull();
+      expect(style?.textContent).toContain(
+        "@import url('https://fonts.googleapis.com/css2?family=Inter')"
+      );
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe(
+        "'Inter', sans-serif"
+      );
+      expect(document.body.style.getPropertyValue("font-family")).toBe('"Inter", sans-serif');
+    });
+
+    it("injects @font-face for a direct font file URL (.woff2) and applies font to body", async () => {
+      await applyCustomUiFont("https://example.com/fonts/Inter.woff2", "Inter");
+      const style = document.getElementById("hikari-custom-ui-font");
+      expect(style).not.toBeNull();
+      expect(style?.textContent).toContain("@font-face");
+      expect(style?.textContent).toContain("url('https://example.com/fonts/Inter.woff2')");
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe(
+        "'Inter', sans-serif"
+      );
+      expect(document.body.style.getPropertyValue("font-family")).toBe('"Inter", sans-serif');
+    });
+
+    it("uses HikariCustomUiFont as fallback family and applies it to body", async () => {
+      await applyCustomUiFont("https://example.com/fonts/Inter.woff2", "");
+      const style = document.getElementById("hikari-custom-ui-font");
+      expect(style?.textContent).toContain("'HikariCustomUiFont'");
+      expect(document.body.style.getPropertyValue("font-family")).toBe(
+        '"HikariCustomUiFont", sans-serif'
+      );
+    });
+
+    it("reads local file and embeds as data URL, applies font to body", async () => {
+      const fakeData = new Uint8Array([104, 101, 108, 108, 111]);
+      readFileMock.mockResolvedValueOnce(fakeData);
+
+      await applyCustomUiFont("/home/naomi/.fonts/Inter.ttf", "Inter");
+
+      expect(readFileMock).toHaveBeenCalledWith("/home/naomi/.fonts/Inter.ttf");
+      const style = document.getElementById("hikari-custom-ui-font");
+      expect(style?.textContent).toContain("data:font/ttf;base64,");
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe(
+        "'Inter', sans-serif"
+      );
+      expect(document.body.style.getPropertyValue("font-family")).toBe('"Inter", sans-serif');
+    });
+
+    it("sets CSS variable and body font-family when only family is provided (no path)", async () => {
+      await applyCustomUiFont("", "SystemUiFont");
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe(
+        "'SystemUiFont', sans-serif"
+      );
+      expect(document.body.style.getPropertyValue("font-family")).toBe(
+        '"SystemUiFont", sans-serif'
+      );
+    });
+
+    it("replaces a previously injected style element", async () => {
+      await applyCustomUiFont("https://fonts.googleapis.com/css2?family=Inter", "Inter");
+      expect(document.getElementById("hikari-custom-ui-font")).not.toBeNull();
+
+      await applyCustomUiFont("https://fonts.googleapis.com/css2?family=Roboto", "Roboto");
+      const styles = document.querySelectorAll("#hikari-custom-ui-font");
+      expect(styles.length).toBe(1);
+      expect(styles[0].textContent).toContain("Roboto");
+    });
+  });
+
+  describe("setCustomUiFont", () => {
+    const readFileMock = vi.mocked(readFile);
+    const invokeMock = vi.mocked(invoke);
+
+    beforeEach(() => {
+      document.getElementById("hikari-custom-ui-font")?.remove();
+      document.documentElement.style.removeProperty("--ui-font-family");
+      document.body.style.removeProperty("font-family");
+      readFileMock.mockReset();
+      invokeMock.mockResolvedValue(undefined);
+    });
+
+    it("saves config and applies the UI font", async () => {
+      await configStore.setCustomUiFont(null, null);
+      await configStore.setCustomUiFont("https://fonts.googleapis.com/css2?family=Inter", "Inter");
+
+      expect(invokeMock).toHaveBeenCalledWith(
+        "save_config",
+        expect.objectContaining({
+          config: expect.objectContaining({
+            custom_ui_font_path: "https://fonts.googleapis.com/css2?family=Inter",
+            custom_ui_font_family: "Inter",
+          }),
+        })
+      );
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe(
+        "'Inter', sans-serif"
+      );
+      expect(document.body.style.getPropertyValue("font-family")).toBe('"Inter", sans-serif');
+    });
+
+    it("clears UI font when called with nulls", async () => {
+      document.documentElement.style.setProperty("--ui-font-family", "'SomeFont', sans-serif");
+      document.body.style.setProperty("font-family", "'SomeFont', sans-serif");
+      await configStore.setCustomUiFont(null, null);
+
+      expect(document.documentElement.style.getPropertyValue("--ui-font-family")).toBe("");
+      expect(document.body.style.getPropertyValue("font-family")).toBe("");
+      expect(invokeMock).toHaveBeenCalledWith(
+        "save_config",
+        expect.objectContaining({
+          config: expect.objectContaining({
+            custom_ui_font_path: null,
+            custom_ui_font_family: null,
+          }),
+        })
+      );
+    });
+  });
 });
@@ -1,5 +1,6 @@
 import { writable, derived } from "svelte/store";
 import { invoke } from "@tauri-apps/api/core";
+import { readFile } from "@tauri-apps/plugin-fs";

 export type Theme = "dark" | "light" | "high-contrast" | "custom";
 export type BudgetAction = "warn" | "block";
@@ -58,6 +59,12 @@ export interface HikariConfig {
  // Background image settings
  background_image_path: string | null;
  background_image_opacity: number;
+  // Custom terminal font settings
+  custom_font_path: string | null;
+  custom_font_family: string | null;
+  // Custom UI font settings
+  custom_ui_font_path: string | null;
+  custom_ui_font_family: string | null;
 }

 const defaultConfig: HikariConfig = {
@@ -104,6 +111,10 @@ const defaultConfig: HikariConfig = {
  trusted_workspaces: [],
  background_image_path: null,
  background_image_opacity: 0.3,
+  custom_font_path: null,
+  custom_font_family: null,
+  custom_ui_font_path: null,
+  custom_ui_font_family: null,
 };

 function createConfigStore() {
@@ -240,6 +251,16 @@ function createConfigStore() {
    setCompactMode: async (enabled: boolean) => {
      await updateConfig({ compact_mode: enabled });
    },
+
+    setCustomFont: async (path: string | null, family: string | null) => {
+      await updateConfig({ custom_font_path: path, custom_font_family: family });
+      await applyCustomFont(path, family);
+    },
+
+    setCustomUiFont: async (path: string | null, family: string | null) => {
+      await updateConfig({ custom_ui_font_path: path, custom_ui_font_family: family });
+      await applyCustomUiFont(path, family);
+    },
  };
 }

@@ -305,6 +326,99 @@ export function clampFontSize(size: number): number {
  return Math.max(MIN_FONT_SIZE, Math.min(MAX_FONT_SIZE, size));
 }

+const DIRECT_FONT_EXTENSIONS = new Set(["woff", "woff2", "ttf", "otf", "eot"]);
+
+const FONT_MIME_MAP: Record<string, string> = {
+  woff: "font/woff",
+  woff2: "font/woff2",
+  ttf: "font/ttf",
+  otf: "font/otf",
+  eot: "application/vnd.ms-fontobject",
+};
+
+async function applyFontFromSource(path: string, family: string, styleId: string): Promise<void> {
+  const style = document.createElement("style");
+  style.id = styleId;
+
+  if (path.startsWith("http://") || path.startsWith("https://")) {
+    const ext = path.split(".").pop()?.toLowerCase() ?? "";
+
+    if (DIRECT_FONT_EXTENSIONS.has(ext)) {
+      style.textContent = `@font-face { font-family: '${family}'; src: url('${path}'); }`;
+    } else {
+      style.textContent = `@import url('${path}');`;
+    }
+  } else {
+    const data = await readFile(path);
+    const chunks: string[] = [];
+    const chunkSize = 8192;
+    for (let i = 0; i < data.length; i += chunkSize) {
+      chunks.push(String.fromCharCode(...data.slice(i, i + chunkSize)));
+    }
+    const ext = path.split(".").pop()?.toLowerCase() ?? "ttf";
+    const mime = FONT_MIME_MAP[ext] ?? "font/ttf";
+    const dataUrl = `data:${mime};base64,${btoa(chunks.join(""))}`;
+    style.textContent = `@font-face { font-family: '${family}'; src: url('${dataUrl}'); }`;
+  }
+
+  document.head.appendChild(style);
+}
+
+export async function applyCustomFont(path: string | null, family: string | null): Promise<void> {
+  if (typeof document === "undefined") return;
+
+  const styleId = "hikari-custom-font";
+  const cssVar = "--terminal-font-family";
+  const fallbackFamily = "HikariCustomFont";
+
+  document.getElementById(styleId)?.remove();
+
+  const trimmedPath = path?.trim() ?? "";
+  const trimmedFamily = family?.trim() ?? "";
+
+  if (!trimmedPath && !trimmedFamily) {
+    document.documentElement.style.removeProperty(cssVar);
+    return;
+  }
+
+  if (trimmedPath) {
+    await applyFontFromSource(trimmedPath, trimmedFamily || fallbackFamily, styleId);
+  }
+
+  if (trimmedFamily) {
+    document.documentElement.style.setProperty(cssVar, `'${trimmedFamily}', monospace`);
+  }
+}
+
+export async function applyCustomUiFont(path: string | null, family: string | null): Promise<void> {
+  if (typeof document === "undefined") return;
+
+  const styleId = "hikari-custom-ui-font";
+  const cssVar = "--ui-font-family";
+  const fallbackFamily = "HikariCustomUiFont";
+
+  document.getElementById(styleId)?.remove();
+
+  const trimmedPath = path?.trim() ?? "";
+  const trimmedFamily = family?.trim() ?? "";
+
+  if (!trimmedPath && !trimmedFamily) {
+    document.documentElement.style.removeProperty(cssVar);
+    document.body?.style.removeProperty("font-family");
+    return;
+  }
+
+  const effectiveFamily = trimmedFamily || fallbackFamily;
+
+  if (trimmedPath) {
+    await applyFontFromSource(trimmedPath, effectiveFamily, styleId);
+  }
+
+  const fontValue = `'${effectiveFamily}', sans-serif`;
+  document.documentElement.style.setProperty(cssVar, fontValue);
+  document.body?.style.setProperty("font-family", fontValue);
+}
+
 export { MIN_FONT_SIZE, MAX_FONT_SIZE, DEFAULT_FONT_SIZE };

 export const configStore = createConfigStore();
@@ -0,0 +1,639 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { get } from "svelte/store";
+import { editorStore } from "$lib/stores/editor";
+import { setMockInvokeResult } from "../../../vitest.setup";
+
+const FILE_CONTENT = "// test file content";
+
+// Reset tabs between tests
+afterEach(async () => {
+  const tabs = get(editorStore.tabs);
+  for (const tab of tabs) {
+    editorStore.closeTab(tab.id);
+  }
+  editorStore.hideEditor();
+});
+
+describe("editorStore - openFile (tests getLanguageFromPath)", () => {
+  const testCases: [string, string][] = [
+    ["file.ts", "typescript"],
+    ["file.tsx", "typescript"],
+    ["file.js", "javascript"],
+    ["file.jsx", "javascript"],
+    ["file.py", "python"],
+    ["file.rs", "rust"],
+    ["file.go", "go"],
+    ["file.java", "java"],
+    ["file.c", "c"],
+    ["file.cpp", "cpp"],
+    ["file.h", "c"],
+    ["file.hpp", "cpp"],
+    ["file.cs", "csharp"],
+    ["file.rb", "ruby"],
+    ["file.php", "php"],
+    ["file.swift", "swift"],
+    ["file.kt", "kotlin"],
+    ["file.scala", "scala"],
+    ["file.html", "html"],
+    ["file.htm", "html"],
+    ["file.css", "css"],
+    ["file.scss", "scss"],
+    ["file.sass", "sass"],
+    ["file.less", "less"],
+    ["file.json", "json"],
+    ["file.xml", "xml"],
+    ["file.yaml", "yaml"],
+    ["file.yml", "yaml"],
+    ["file.toml", "toml"],
+    ["file.md", "markdown"],
+    ["file.markdown", "markdown"],
+    ["file.sql", "sql"],
+    ["file.sh", "shell"],
+    ["file.bash", "shell"],
+    ["file.zsh", "shell"],
+    ["file.ps1", "powershell"],
+    ["file.svelte", "svelte"],
+    ["file.vue", "vue"],
+    ["file.graphql", "graphql"],
+    ["file.gql", "graphql"],
+    ["file.lua", "lua"],
+    ["file.r", "r"],
+    ["file.dart", "dart"],
+    ["file.elm", "elm"],
+    ["file.ex", "elixir"],
+    ["file.exs", "elixir"],
+    ["file.erl", "erlang"],
+    ["file.hs", "haskell"],
+    ["file.clj", "clojure"],
+    ["file.lisp", "lisp"],
+    ["file.ml", "ocaml"],
+    ["file.fs", "fsharp"],
+    ["file.zig", "zig"],
+    ["file.nim", "nim"],
+    ["file.v", "v"],
+    ["file.wasm", "wasm"],
+    ["file.wat", "wasm"],
+    ["dockerfile", "plaintext"],
+    ["file.unknown", "plaintext"],
+    ["file", "plaintext"],
+  ];
+
+  it.each(testCases)("maps %s to language %s", async (filename, expectedLanguage) => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile(`/path/to/${filename}`);
+    const activeTab = get(editorStore.activeTab);
+    expect(activeTab?.language).toBe(expectedLanguage);
+    if (activeTab) editorStore.closeTab(activeTab.id);
+  });
+
+  it("opens a new tab and makes it active", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file.ts");
+    const tabs = get(editorStore.tabs);
+    const activeTab = get(editorStore.activeTab);
+    expect(tabs).toHaveLength(1);
+    expect(activeTab?.fileName).toBe("file.ts");
+    expect(activeTab?.content).toBe(FILE_CONTENT);
+    expect(activeTab?.isDirty).toBe(false);
+  });
+
+  it("switches to existing tab instead of opening a duplicate", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file.ts");
+    const firstTabId = get(editorStore.activeTabId);
+
+    // Open another file to change active tab
+    await editorStore.openFile("/path/to/other.ts");
+    const secondTabId = get(editorStore.activeTabId);
+    expect(secondTabId).not.toBe(firstTabId);
+
+    // Re-open first file — should switch to existing tab
+    await editorStore.openFile("/path/to/file.ts");
+    expect(get(editorStore.activeTabId)).toBe(firstTabId);
+    expect(get(editorStore.tabs)).toHaveLength(2);
+  });
+
+  it("handles open file errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("read_file_content", new Error("File not found"));
+    await editorStore.openFile("/path/to/missing.ts");
+    expect(get(editorStore.tabs)).toHaveLength(0);
+    expect(get(editorStore.saveError)).toContain("Failed to open file");
+    consoleErrorSpy.mockRestore();
+  });
+
+  it("extracts filename from path correctly", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/deep/nested/path/component.svelte");
+    expect(get(editorStore.activeTab)?.fileName).toBe("component.svelte");
+  });
+});
+
+describe("editorStore - saveFile", () => {
+  beforeEach(async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file.ts");
+    // Make it dirty first
+    editorStore.updateTabContent(get(editorStore.activeTabId)!, "modified content");
+  });
+
+  it("saves the active tab successfully", async () => {
+    setMockInvokeResult("write_file_content", undefined);
+    await editorStore.saveFile();
+    expect(get(editorStore.activeTab)?.isDirty).toBe(false);
+    expect(get(editorStore.activeTab)?.originalContent).toBe("modified content");
+  });
+
+  it("saves a specific tab by ID", async () => {
+    setMockInvokeResult("write_file_content", undefined);
+    const tabId = get(editorStore.activeTabId)!;
+    await editorStore.saveFile(tabId);
+    expect(get(editorStore.activeTab)?.isDirty).toBe(false);
+  });
+
+  it("does nothing when no tab ID matches", async () => {
+    await editorStore.saveFile("non-existent-tab");
+    // No error = pass
+  });
+});
+
+describe("editorStore - saveFile error", () => {
+  it("sets saveError when write fails", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file-err.ts");
+    editorStore.updateTabContent(get(editorStore.activeTabId)!, "modified content");
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("write_file_content", new Error("Permission denied"));
+    await editorStore.saveFile().catch(() => {});
+    expect(get(editorStore.saveError)).toContain("Failed to save file");
+    consoleErrorSpy.mockRestore();
+  });
+});
+
+describe("editorStore - updateTabContent", () => {
+  beforeEach(async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file.ts");
+  });
+
+  it("updates content and marks tab as dirty", () => {
+    const tabId = get(editorStore.activeTabId)!;
+    editorStore.updateTabContent(tabId, "new content");
+    const tab = get(editorStore.activeTab);
+    expect(tab?.content).toBe("new content");
+    expect(tab?.isDirty).toBe(true);
+  });
+
+  it("marks tab as clean when content matches original", () => {
+    const tabId = get(editorStore.activeTabId)!;
+    editorStore.updateTabContent(tabId, "modified");
+    expect(get(editorStore.activeTab)?.isDirty).toBe(true);
+    editorStore.updateTabContent(tabId, FILE_CONTENT);
+    expect(get(editorStore.activeTab)?.isDirty).toBe(false);
+  });
+
+  it("hasDirtyTabs is true when any tab is dirty", () => {
+    const tabId = get(editorStore.activeTabId)!;
+    expect(get(editorStore.hasDirtyTabs)).toBe(false);
+    editorStore.updateTabContent(tabId, "dirty content");
+    expect(get(editorStore.hasDirtyTabs)).toBe(true);
+  });
+});
+
+describe("editorStore - closeTab", () => {
+  beforeEach(async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file1.ts");
+    await editorStore.openFile("/path/to/file2.ts");
+  });
+
+  it("removes the specified tab", () => {
+    const tabs = get(editorStore.tabs);
+    editorStore.closeTab(tabs[0].id);
+    expect(get(editorStore.tabs)).toHaveLength(1);
+    expect(get(editorStore.tabs)[0].filePath).toBe("/path/to/file2.ts");
+  });
+
+  it("sets active tab to remaining tab when active tab is closed", () => {
+    const activeTabId = get(editorStore.activeTabId)!;
+    editorStore.closeTab(activeTabId);
+    expect(get(editorStore.activeTabId)).not.toBe(activeTabId);
+    expect(get(editorStore.tabs)).toHaveLength(1);
+  });
+});
+
+describe("editorStore - setActiveTab", () => {
+  beforeEach(async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file1.ts");
+    await editorStore.openFile("/path/to/file2.ts");
+  });
+
+  it("sets the active tab to the specified ID", () => {
+    const tabs = get(editorStore.tabs);
+    editorStore.setActiveTab(tabs[0].id);
+    expect(get(editorStore.activeTabId)).toBe(tabs[0].id);
+  });
+});
+
+describe("editorStore - visibility controls", () => {
+  it("showEditor sets isEditorVisible to true", () => {
+    expect(get(editorStore.isEditorVisible)).toBe(false);
+    editorStore.showEditor();
+    expect(get(editorStore.isEditorVisible)).toBe(true);
+  });
+
+  it("hideEditor sets isEditorVisible to false", () => {
+    editorStore.showEditor();
+    editorStore.hideEditor();
+    expect(get(editorStore.isEditorVisible)).toBe(false);
+  });
+
+  it("toggleEditor toggles isEditorVisible", () => {
+    expect(get(editorStore.isEditorVisible)).toBe(false);
+    editorStore.toggleEditor();
+    expect(get(editorStore.isEditorVisible)).toBe(true);
+    editorStore.toggleEditor();
+    expect(get(editorStore.isEditorVisible)).toBe(false);
+  });
+});
+
+describe("editorStore - toggleFileBrowser", () => {
+  it("toggles the file browser visibility", () => {
+    const initial = get(editorStore.isFileBrowserOpen);
+    editorStore.toggleFileBrowser();
+    expect(get(editorStore.isFileBrowserOpen)).toBe(!initial);
+    editorStore.toggleFileBrowser();
+    expect(get(editorStore.isFileBrowserOpen)).toBe(initial);
+  });
+});
+
+describe("editorStore - file system operations", () => {
+  it("createFile invokes backend and refreshes directory", async () => {
+    setMockInvokeResult("create_file", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.createFile("/path/to", "new-file.ts");
+    // No error = success
+  });
+
+  it("createFile handles errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("create_file", new Error("Permission denied"));
+    await editorStore.createFile("/path/to", "new-file.ts");
+    expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to create file:", expect.any(Error));
+    consoleErrorSpy.mockRestore();
+  });
+
+  it("createDirectory invokes backend and refreshes", async () => {
+    setMockInvokeResult("create_directory", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.createDirectory("/path/to", "new-dir");
+  });
+
+  it("createDirectory handles errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("create_directory", new Error("Failed"));
+    await editorStore.createDirectory("/path/to", "new-dir");
+    expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to create directory:", expect.any(Error));
+    consoleErrorSpy.mockRestore();
+  });
+
+  it("deleteFile invokes backend and refreshes", async () => {
+    setMockInvokeResult("delete_file", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.deleteFile("/path/to/file.ts");
+  });
+
+  it("deleteFile handles errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("delete_file", new Error("Failed"));
+    await editorStore.deleteFile("/path/to/file.ts");
+    expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to delete file:", expect.any(Error));
+    consoleErrorSpy.mockRestore();
+  });
+
+  it("deleteDirectory invokes backend and refreshes", async () => {
+    setMockInvokeResult("delete_directory", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.deleteDirectory("/path/to/dir");
+  });
+
+  it("deleteDirectory handles errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("delete_directory", new Error("Failed"));
+    await editorStore.deleteDirectory("/path/to/dir");
+    expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to delete directory:", expect.any(Error));
+    consoleErrorSpy.mockRestore();
+  });
+
+  it("renamePath invokes backend and refreshes", async () => {
+    setMockInvokeResult("rename_path", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.renamePath("/path/to/old-name.ts", "new-name.ts");
+  });
+
+  it("renamePath handles errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("rename_path", new Error("Failed"));
+    await editorStore.renamePath("/path/to/old-name.ts", "new-name.ts");
+    expect(consoleErrorSpy).toHaveBeenCalledWith("Failed to rename:", expect.any(Error));
+    consoleErrorSpy.mockRestore();
+  });
+});
+
+describe("editorStore - initializeFileTree", () => {
+  it("loads directory entries and updates file tree", async () => {
+    const entries = [
+      { path: "/path/file.ts", name: "file.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", entries);
+    await editorStore.initializeFileTree("/path");
+    expect(get(editorStore.fileTree)).toEqual(entries);
+    expect(get(editorStore.currentDirectory)).toBe("/path");
+  });
+
+  it("handles errors gracefully", async () => {
+    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("list_directory", new Error("Failed"));
+    await editorStore.initializeFileTree("/path");
+    expect(get(editorStore.isLoadingTree)).toBe(false);
+    consoleErrorSpy.mockRestore();
+  });
+});
+
+describe("editorStore - toggleDirectory", () => {
+  beforeEach(async () => {
+    const entries = [
+      {
+        path: "/path/dir",
+        name: "dir",
+        isDirectory: true,
+        isExpanded: false,
+        children: undefined,
+      },
+    ];
+    setMockInvokeResult("list_directory", entries);
+    await editorStore.initializeFileTree("/path");
+  });
+
+  it("does nothing when entry is not a directory", async () => {
+    const nonDirEntry = {
+      path: "/path/file.ts",
+      name: "file.ts",
+      isDirectory: false,
+    };
+    const treeBefore = get(editorStore.fileTree);
+    await editorStore.toggleDirectory(nonDirEntry);
+    expect(get(editorStore.fileTree)).toEqual(treeBefore);
+  });
+
+  it("expands a collapsed directory and loads children asynchronously", async () => {
+    const children = [
+      { path: "/path/dir/child.ts", name: "child.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", children);
+
+    const dirEntry = get(editorStore.fileTree)[0];
+    await editorStore.toggleDirectory(dirEntry);
+
+    const updatedEntry = get(editorStore.fileTree)[0];
+    expect(updatedEntry.isExpanded).toBe(true);
+    expect(updatedEntry.children).toEqual(children);
+    expect(updatedEntry.isLoading).toBe(false);
+  });
+
+  it("collapses an expanded directory", async () => {
+    const children = [
+      { path: "/path/dir/child.ts", name: "child.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", children);
+
+    // Expand first
+    const dirEntry = get(editorStore.fileTree)[0];
+    await editorStore.toggleDirectory(dirEntry);
+    expect(get(editorStore.fileTree)[0].isExpanded).toBe(true);
+
+    // Now collapse
+    const expandedEntry = get(editorStore.fileTree)[0];
+    await editorStore.toggleDirectory(expandedEntry);
+    expect(get(editorStore.fileTree)[0].isExpanded).toBe(false);
+  });
+
+  it("expands a directory that already has children without reloading", async () => {
+    // Re-init with a directory that already has children
+    const entries = [
+      {
+        path: "/path/dir",
+        name: "dir",
+        isDirectory: true,
+        isExpanded: false,
+        children: [
+          {
+            path: "/path/dir/child.ts",
+            name: "child.ts",
+            isDirectory: false,
+            children: undefined,
+          },
+        ],
+      },
+    ];
+    setMockInvokeResult("list_directory", entries);
+    await editorStore.initializeFileTree("/path");
+
+    // Toggle should expand without loading (children already present)
+    const dirEntry = get(editorStore.fileTree)[0];
+    await editorStore.toggleDirectory(dirEntry);
+
+    const updatedEntry = get(editorStore.fileTree)[0];
+    expect(updatedEntry.isExpanded).toBe(true);
+    expect(updatedEntry.children).toHaveLength(1);
+  });
+
+  it("handles tree with multiple entries when toggling — exercises non-matching leaf fallback", async () => {
+    // Tree has dir + a sibling file; toggling dir exercises the `return e` branch for the file
+    const entries = [
+      {
+        path: "/path/dir",
+        name: "dir",
+        isDirectory: true,
+        isExpanded: false,
+        children: undefined,
+      },
+      { path: "/path/file.ts", name: "file.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", entries);
+    await editorStore.initializeFileTree("/path");
+
+    const children: never[] = [];
+    setMockInvokeResult("list_directory", children);
+    const dirEntry = get(editorStore.fileTree)[0];
+    await editorStore.toggleDirectory(dirEntry);
+
+    // The sibling file should remain unchanged
+    expect(get(editorStore.fileTree)[1].path).toBe("/path/file.ts");
+    expect(get(editorStore.fileTree)[0].isExpanded).toBe(true);
+  });
+
+  it("handles nested directory toggle — exercises recursive updateTree branches", async () => {
+    // Tree: outer_dir → [inner_dir (no children), sibling_file]
+    // Toggling inner_dir covers the recursive path through outer's children
+    const entries = [
+      {
+        path: "/path/outer",
+        name: "outer",
+        isDirectory: true,
+        isExpanded: true,
+        children: [
+          {
+            path: "/path/outer/inner",
+            name: "inner",
+            isDirectory: true,
+            isExpanded: false,
+            children: undefined,
+          },
+          {
+            path: "/path/outer/sibling.ts",
+            name: "sibling.ts",
+            isDirectory: false,
+            children: undefined,
+          },
+        ],
+      },
+    ];
+    setMockInvokeResult("list_directory", entries);
+    await editorStore.initializeFileTree("/path");
+
+    const innerChildren = [
+      {
+        path: "/path/outer/inner/deep.ts",
+        name: "deep.ts",
+        isDirectory: false,
+        children: undefined,
+      },
+    ];
+    setMockInvokeResult("list_directory", innerChildren);
+
+    const innerEntry = get(editorStore.fileTree)[0].children![0];
+    await editorStore.toggleDirectory(innerEntry);
+
+    const outer = get(editorStore.fileTree)[0];
+    expect(outer.children![0].isExpanded).toBe(true);
+    expect(outer.children![0].children).toEqual(innerChildren);
+  });
+});
+
+describe("editorStore - deleteFile closes open tab", () => {
+  it("closes the tab when the deleted file is open", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/file.ts");
+    expect(get(editorStore.tabs)).toHaveLength(1);
+
+    setMockInvokeResult("delete_file", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.deleteFile("/path/to/file.ts");
+    expect(get(editorStore.tabs)).toHaveLength(0);
+  });
+});
+
+describe("editorStore - deleteDirectory closes open tabs", () => {
+  it("closes all tabs inside the deleted directory", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/dir/file1.ts");
+    await editorStore.openFile("/path/to/dir/nested/file2.ts");
+    await editorStore.openFile("/path/to/other.ts");
+    expect(get(editorStore.tabs)).toHaveLength(3);
+
+    setMockInvokeResult("delete_directory", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.deleteDirectory("/path/to/dir");
+
+    const remainingTabs = get(editorStore.tabs);
+    expect(remainingTabs).toHaveLength(1);
+    expect(remainingTabs[0].filePath).toBe("/path/to/other.ts");
+  });
+});
+
+describe("editorStore - renamePath updates open tabs", () => {
+  it("updates filePath and fileName when the renamed file is open in a tab", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/old-name.ts");
+
+    setMockInvokeResult("rename_path", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.renamePath("/path/to/old-name.ts", "new-name.ts");
+
+    const tab = get(editorStore.activeTab);
+    expect(tab?.filePath).toBe("/path/to/new-name.ts");
+    expect(tab?.fileName).toBe("new-name.ts");
+  });
+
+  it("updates filePaths for tabs inside a renamed directory", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/old-dir/file.ts");
+
+    setMockInvokeResult("rename_path", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.renamePath("/path/to/old-dir", "new-dir");
+
+    const tab = get(editorStore.activeTab);
+    expect(tab?.filePath).toBe("/path/to/new-dir/file.ts");
+  });
+
+  it("leaves unrelated tabs unchanged when renaming — exercises return-t fallback", async () => {
+    setMockInvokeResult("read_file_content", FILE_CONTENT);
+    await editorStore.openFile("/path/to/unrelated.ts");
+    await editorStore.openFile("/path/to/old-name.ts");
+
+    setMockInvokeResult("rename_path", undefined);
+    setMockInvokeResult("list_directory", []);
+    await editorStore.renamePath("/path/to/old-name.ts", "new-name.ts");
+
+    const tabs = get(editorStore.tabs);
+    const unrelated = tabs.find((t) => t.filePath === "/path/to/unrelated.ts");
+    expect(unrelated).toBeDefined();
+    expect(unrelated?.fileName).toBe("unrelated.ts");
+  });
+});
+
+describe("editorStore - refreshDirectory", () => {
+  it("reloads the entire tree when refreshing the root directory", async () => {
+    const initialEntries = [
+      { path: "/root/file.ts", name: "file.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", initialEntries);
+    await editorStore.initializeFileTree("/root");
+    expect(get(editorStore.fileTree)).toHaveLength(1);
+
+    const updatedEntries = [
+      { path: "/root/file.ts", name: "file.ts", isDirectory: false, children: undefined },
+      { path: "/root/new.ts", name: "new.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", updatedEntries);
+    await editorStore.refreshDirectory("/root");
+    expect(get(editorStore.fileTree)).toHaveLength(2);
+  });
+
+  it("updates a subdirectory entry in the tree", async () => {
+    const initialEntries = [
+      {
+        path: "/root/subdir",
+        name: "subdir",
+        isDirectory: true,
+        isExpanded: true,
+        children: [],
+      },
+    ];
+    setMockInvokeResult("list_directory", initialEntries);
+    await editorStore.initializeFileTree("/root");
+
+    const subChildren = [
+      { path: "/root/subdir/file.ts", name: "file.ts", isDirectory: false, children: undefined },
+    ];
+    setMockInvokeResult("list_directory", subChildren);
+    await editorStore.refreshDirectory("/root/subdir");
+
+    const tree = get(editorStore.fileTree);
+    expect(tree[0].children).toEqual(subChildren);
+    expect(tree[0].isExpanded).toBe(true);
+  });
+});
@@ -220,6 +220,16 @@ describe("sessionsStore - scheduleAutoSave and cancelAutoSave", () => {
  it("handles cancel when no auto-save is pending", () => {
    sessionsStore.cancelAutoSave("non-existent-id");
  });
+
+  it("clears an existing pending auto-save when rescheduled for the same conversation", async () => {
+    setMockInvokeResult("save_session", undefined);
+    setMockInvokeResult("list_sessions", []);
+    const conv = makeConversation();
+    sessionsStore.scheduleAutoSave(conv as never);
+    // Schedule again before timer fires — hits clearTimeout branch (line 487)
+    sessionsStore.scheduleAutoSave(conv as never);
+    await vi.advanceTimersByTimeAsync(2001);
+  });
 });

 describe("sessionsStore - exportSessionAsJson", () => {
@@ -254,6 +264,17 @@ describe("sessionsStore - exportSessionAsJson", () => {
    expect(await sessionsStore.exportSessionAsJson("session-1")).toBe(false);
    spy.mockRestore();
  });
+
+  it("returns false when writeTextFile throws", async () => {
+    const { save } = await import("@tauri-apps/plugin-dialog");
+    const { writeTextFile } = await import("@tauri-apps/plugin-fs");
+    const spy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("load_session", makeSavedSession());
+    vi.mocked(save).mockResolvedValue("/output/session.json");
+    vi.mocked(writeTextFile).mockRejectedValueOnce(new Error("Disk full"));
+    expect(await sessionsStore.exportSessionAsJson("session-1")).toBe(false);
+    spy.mockRestore();
+  });
 });

 describe("sessionsStore - exportSessionAsMarkdown", () => {
@@ -318,6 +339,17 @@ describe("sessionsStore - exportSessionAsMarkdown", () => {
    expect(await sessionsStore.exportSessionAsMarkdown("session-1")).toBe(false);
    spy.mockRestore();
  });
+
+  it("returns false when writeTextFile throws", async () => {
+    const { save } = await import("@tauri-apps/plugin-dialog");
+    const { writeTextFile } = await import("@tauri-apps/plugin-fs");
+    const spy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("load_session", makeSavedSession());
+    vi.mocked(save).mockResolvedValue("/output/session.md");
+    vi.mocked(writeTextFile).mockRejectedValueOnce(new Error("Disk full"));
+    expect(await sessionsStore.exportSessionAsMarkdown("session-1")).toBe(false);
+    spy.mockRestore();
+  });
 });

 describe("sessionsStore - exportSessionAsHtml (tests escapeHtml + generateHtmlExport)", () => {
@@ -424,6 +456,17 @@ describe("sessionsStore - exportSessionAsHtml (tests escapeHtml + generateHtmlEx
    expect(await sessionsStore.exportSessionAsHtml("session-1")).toBe(false);
    spy.mockRestore();
  });
+
+  it("returns false when writeTextFile throws", async () => {
+    const { save } = await import("@tauri-apps/plugin-dialog");
+    const { writeTextFile } = await import("@tauri-apps/plugin-fs");
+    const spy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("load_session", makeSavedSession());
+    vi.mocked(save).mockResolvedValue("/output/session.html");
+    vi.mocked(writeTextFile).mockRejectedValueOnce(new Error("Disk full"));
+    expect(await sessionsStore.exportSessionAsHtml("session-1")).toBe(false);
+    spy.mockRestore();
+  });
 });

 describe("sessionsStore - exportSessionAsPdf (tests generatePrintableHtml)", () => {
@@ -472,6 +515,17 @@ describe("sessionsStore - exportSessionAsPdf (tests generatePrintableHtml)", ()
    expect(await sessionsStore.exportSessionAsPdf("session-1")).toBe(false);
    spy.mockRestore();
  });
+
+  it("returns false when writeTextFile throws", async () => {
+    const { save } = await import("@tauri-apps/plugin-dialog");
+    const { writeTextFile } = await import("@tauri-apps/plugin-fs");
+    const spy = vi.spyOn(console, "error").mockImplementation(() => {});
+    setMockInvokeResult("load_session", makeSavedSession());
+    vi.mocked(save).mockResolvedValue("/output/session-print.html");
+    vi.mocked(writeTextFile).mockRejectedValueOnce(new Error("Disk full"));
+    expect(await sessionsStore.exportSessionAsPdf("session-1")).toBe(false);
+    spy.mockRestore();
+  });
 });

 describe("sessionsStore - importSession", () => {
@@ -11,7 +11,14 @@
    updateDiscordRpc,
    setSkipNextGreeting,
  } from "$lib/tauri";
-  import { configStore, applyTheme, applyFontSize, isCompactMode } from "$lib/stores/config";
+  import {
+    configStore,
+    applyTheme,
+    applyFontSize,
+    applyCustomFont,
+    applyCustomUiFont,
+    isCompactMode,
+  } from "$lib/stores/config";
  import { readFile } from "@tauri-apps/plugin-fs";
  import { initNotificationSync, cleanupNotificationSync } from "$lib/stores/notifications";
  import { conversationsStore } from "$lib/stores/conversations";
@@ -454,6 +461,8 @@
      const config = configStore.getConfig();
      applyTheme(config.theme, config.custom_theme_colors);
      applyFontSize(config.font_size);
+      await applyCustomFont(config.custom_font_path, config.custom_font_family);
+      await applyCustomUiFont(config.custom_ui_font_path, config.custom_ui_font_family);

      // Apply always-on-top setting
      if (config.always_on_top) {
@@ -593,13 +602,15 @@

 <style>
  .app-container {
-    font-family:
+    font-family: var(
+      --ui-font-family,
      "Inter",
      -apple-system,
      BlinkMacSystemFont,
      "Segoe UI",
      Roboto,
-      sans-serif;
+      sans-serif
+    );
  }

  .character-panel {
@@ -17,7 +17,10 @@ vi.mock("@tauri-apps/api/core", () => ({
    if (command in mockInvokeResults) {
      const result = mockInvokeResults[command];
      if (result instanceof Error) {
-        return Promise.reject(result);
+        const err = result;
+        return Promise.resolve().then(() => {
+          throw err;
+        });
      }
      return Promise.resolve(result);
    }