Fix PDF export font embedding and improve sync reliability

- Replace data URL loading with temporary HTML file to avoid URL length limits
- Embed font files as data URLs in print document CSS for offline rendering
- Add font asset registry for Merriweather, Crimson Pro, Roboto Serif, and Average
- Implement font file caching and blob-to-data-URL conversion
- Clean up temporary HTML file after PDF generation
- Fix sync to refresh notes after favorite status sync completes

src/services/syncManager.ts

@@ -68,7 +68,9 @@ export class SyncManager {
 
     try {
       this.notifyStatus('syncing', 0);
-      const notes = await this.fetchAndCacheNotes();
+      await this.fetchAndCacheNotes();
+      await this.syncFavoriteStatus();
+      const notes = await localDB.getAllNotes();
       this.notifyStatus('idle', 0);
       return notes;
     } catch (error) {