Fix React error #130 - Resolve component import issues

- Fixed wildcard exports in common/index.ts with explicit named exports
- Fixed GalleryView import path in GalleryPage.tsx
- Fixed ToastContainer props formatting in App.tsx
- Ensured all components are properly exported and imported

This should finally resolve the invalid element type error.

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

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

frontend/src/components/common/index.ts

@@ -2,7 +2,14 @@ export { Button } from './Button';
 export { Input } from './Input';
 export { Card, CardHeader, CardContent, CardFooter } from './Card';
 export { Loading, LoadingSkeleton } from './Loading';
-export * from './ErrorBoundary';
-export * from './Skeleton';
-export * from './OfflineIndicator';
-export * from './SkipLink';
+export { ErrorBoundary, PageErrorBoundary } from './ErrorBoundary';
+export { 
+  Skeleton, 
+  SkeletonGroup, 
+  SkeletonCard, 
+  SkeletonTable, 
+  SkeletonGalleryGrid, 
+  SkeletonList 
+} from './Skeleton';
+export { OfflineIndicator, useOnlineStatus } from './OfflineIndicator';
+export { SkipLink } from './SkipLink';