Implement complete frontend with admin panel and theme system

- Add admin authentication and dashboard
- Create event management pages (list, create, edit, archive)
- Implement gallery enhancements (search, sorting, bulk download)
- Add email configuration and archive management pages
- Integrate Umami analytics with tracking throughout the app
- Add comprehensive error boundaries and loading states
- Implement accessibility features (WCAG 2.1 AA compliance)
- Create theme system with preset themes and customization
- Add branding settings and company information management
- Fix backend database initialization and health check
- Configure proper API URLs and environment variables

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/gallery/index.ts

@@ -1,4 +1,5 @@
 export { GalleryView } from './GalleryView';
 export { PhotoGrid } from './PhotoGrid';
 export { PhotoLightbox } from './PhotoLightbox';
-export { ExpirationBanner } from './ExpirationBanner';
+export { ExpirationBanner } from './ExpirationBanner';
+export { CountdownTimer } from './CountdownTimer';