fix: resolve gallery login redirect issue

- Updated API interceptor to better handle gallery authentication
- Fixed 401 error handling to prevent redirect loops on gallery pages
- Improved token extraction logic for gallery API requests
- Consolidated duplicate verifyGalleryAccess middleware
- Added proper error handling in GalleryView component
- Gallery authentication now properly distinguishes from admin routes

The issue was caused by the API interceptor redirecting to admin login
when gallery API calls failed with 401, even when users were already
on gallery pages attempting to authenticate.

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

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

frontend/src/components/gallery/GalleryView.tsx

@@ -52,7 +52,7 @@ export const GalleryView: React.FC<GalleryViewProps> = ({ slug, event }) => {
   const { watermarkEnabled } = useWatermarkSettings();
   
   // Fetch photos
-  const { data, isLoading, error } = useGalleryPhotos(slug);
+  const { data, isLoading, error, refetch } = useGalleryPhotos(slug);
   
   // Debug logging
   useEffect(() => {
@@ -294,11 +294,20 @@ export const GalleryView: React.FC<GalleryViewProps> = ({ slug, event }) => {
   }
 
   if (error || !data) {
+    // Check if it's an authentication error (401)
+    const is401Error = (error as any)?.response?.status === 401;
+    
+    if (is401Error) {
+      // Authentication failed - logout and let the parent component handle re-authentication
+      logout();
+      return null;
+    }
+    
     return (
       <div className="min-h-screen bg-neutral-50 flex items-center justify-center">
         <div className="text-center">
           <p className="text-lg text-neutral-600">{t('gallery.failedToLoad')}</p>
-          <Button onClick={() => window.location.reload()} className="mt-4">
+          <Button onClick={() => refetch()} className="mt-4">
             {t('gallery.tryAgain')}
           </Button>
         </div>