feat: add live Discord sharing functionality with dynamic habit progress images

- Implemented live card image generation for user habits using canvas.
- Created API endpoints for starting and managing live Discord sharing sessions.
- Added tests for live Discord sharing to ensure functionality and reliability.
- Introduced CSS styles for the live Discord sharing interface.
- Enhanced error handling and state management for Discord message updates.

src/index.ts

@@ -22,6 +22,8 @@ if (import.meta.hot) import.meta.hot.dispose(() => reminders?.stop());
 
 const app = createApi(db, readAuthConfig(), undefined, undefined, undefined, readDiscordSharingConfig(), { healthy: () => !backups?.state.enabled || (!backups.state.failed && backups.state.lastSuccess > 0) });
 
+if (import.meta.hot) import.meta.hot.dispose(() => app.stopLiveSharing());
+
 const server = Bun.serve({
   hostname: "127.0.0.1",
   port: Number(process.env.PORT ?? 3000),