feat: add task comments feature with CRUD operations

- Introduced a new `task_comments` table in the database schema.
- Implemented task comments API endpoints for listing, creating, and deleting comments.
- Enhanced the task detail dialog to display comments and allow users to add new comments.
- Updated task row component to handle click events for viewing task details.
- Added a theme provider to manage light/dark mode across the application.
- Refactored Milkdown editor to use Crepe for improved markdown editing experience.
- Updated global styles to accommodate new editor and theme changes.
- Enhanced task filtering and sorting functionality in the tasks page.

vite.main.config.mts

@@ -5,7 +5,7 @@ export default defineConfig({
   build: {
     rollupOptions: {
       // Externalize native Node modules — they're rebuilt by electron-forge
-      external: ['better-sqlite3'],
+      external: ['better-sqlite3', 'keytar'],
       output: {
         entryFileNames: 'main.js',
       },