Fix mobile responsiveness and implement enhanced theme system

- Fixed mobile gallery login box sizing and layout
- Fixed header button layout for mobile screens
- Fixed duplicate logo issue on logout
- Fixed '0' rendering when upload button is hidden
- Fixed horizontal scrolling on small screens

- Implemented comprehensive theme system with gallery layouts
- Added 6 different gallery layouts: Grid, Masonry, Carousel, Timeline, Hero, Mosaic
- Created enhanced theme customizer with layout selection
- Added theme presets for different event types
- Updated event creation with theme preview and customization
- Fixed all TypeScript compilation errors

- Added missing translation keys for create event page
- Added translations for theme customization features

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

Co-Authored-By: Claude <[email protected]>

frontend/src/pages/admin/index.ts

@@ -1,7 +1,7 @@
 export { AdminLoginPage } from './AdminLoginPage';
 export { AdminDashboard } from './AdminDashboard';
 export { EventsListPage } from './EventsListPage';
-export { CreateEventPage } from './CreateEventPage';
+export { CreateEventPageEnhanced as CreateEventPage } from './CreateEventPageEnhanced';
 export { EventDetailsPage } from './EventDetailsPage';
 export { EmailConfigPage } from './EmailConfigPage';
 export { ArchivesPage } from './ArchivesPage';