Fix multiple bugs: thumbnail generation, branding settings, categories, theme, feedback icons, upload limit, email errors

Bug fixes included:

#52 - Thumbnail Generation: Added proper parsing of settings values and validation
      of Sharp fit parameter to handle JSON-encoded strings correctly

#61 - Branding Settings Not Persisting: Added _parseBoolean helper for reliable
      boolean parsing, added hide_powered_by option for white-label support

#55 - Categories Not Applied: Fixed category update logic to properly handle
      numeric category IDs, added updated_at timestamp, improved cache invalidation

#59/#56 - Gallery Layout & Apply Theme: Set isPreviewMode=true so theme changes
      immediately propagate to parent state, hidden redundant Apply button

#58 - Feedback Icons Show When Disabled: Added feedbackEnabled check to comment
      and like buttons in MasonryGalleryLayout and GridGalleryLayout

#57 - Upload Limit 100MB: Increased body parser limit from 100MB to 500MB to
      support larger batch uploads

#54 - Wrong Error Message: Enhanced email error handling with specific error
      codes and translation keys for better user feedback

frontend/src/components/admin/AdminPhotoViewer.tsx

@@ -109,8 +109,11 @@ export const AdminPhotoViewer: React.FC<AdminPhotoViewerProps> = ({
       await photosService.updatePhotoCategory(eventId, currentPhoto.id, categoryId);
       toast.success('Category updated');
       setShowCategoryMenu(false);
-      // Trigger refresh to update the photo data
-      onPhotoDeleted(); // This will refresh the photos list
+      // Invalidate photos query to refresh data
+      await queryClient.invalidateQueries({ queryKey: ['admin-event-photos', eventId.toString()] });
+      await queryClient.invalidateQueries({ queryKey: ['admin-event-photos', eventId] });
+      // Also trigger the parent's refresh callback
+      onPhotoDeleted();
     } catch (error) {
       toast.error('Failed to update category');
     }

frontend/src/components/gallery/GalleryLayout.tsx

@@ -29,6 +29,7 @@ interface GalleryLayoutProps {
     logo_display_header?: boolean;
     logo_display_hero?: boolean;
     logo_display_mode?: 'logo_only' | 'text_only' | 'logo_and_text';
+    hide_powered_by?: boolean;
   };
   showLogout?: boolean;
   onLogout?: () => void;
@@ -438,7 +439,10 @@ export const GalleryLayout: React.FC<GalleryLayoutProps> = ({
             </p>
           )}
           <p className="text-xs sm:text-sm text-neutral-500">
-            {brandingSettings?.footer_text || '© 2024 Your Company. All rights reserved.'} | Powered by <span className="font-semibold">PicPeak</span>
+            {brandingSettings?.footer_text || '© 2024 Your Company. All rights reserved.'}
+            {!brandingSettings?.hide_powered_by && (
+              <> | Powered by <span className="font-semibold">PicPeak</span></>
+            )}
           </p>
           {brandingSettings?.company_name && brandingSettings?.company_tagline && (
             <p className="text-xs text-neutral-400 mt-2">

frontend/src/components/gallery/GalleryView.tsx

@@ -165,6 +165,13 @@ export const GalleryView: React.FC<GalleryViewProps> = ({ slug, event }) => {
         footer_text: settingsData.branding_footer_text || '© 2024 Your Company. All rights reserved.',
         watermark_enabled: settingsData.branding_watermark_enabled || false,
         logo_url: settingsData.branding_logo_url || null,
+        logo_size: settingsData.branding_logo_size || 'medium',
+        logo_max_height: settingsData.branding_logo_max_height || 48,
+        logo_position: settingsData.branding_logo_position || 'left',
+        logo_display_header: settingsData.branding_logo_display_header !== false,
+        logo_display_hero: settingsData.branding_logo_display_hero !== false,
+        logo_display_mode: settingsData.branding_logo_display_mode || 'logo_and_text',
+        hide_powered_by: settingsData.branding_hide_powered_by === true,
       });
     }
   }, [settingsData]);

frontend/src/components/gallery/layouts/GridGalleryLayout.tsx

@@ -231,7 +231,7 @@ const GridPhoto: React.FC<GridPhotoProps> = ({
                     <Download className="w-5 h-5 text-neutral-800" />
                   </button>
                 )}
-                {showFeedbackActions && onQuickComment && (
+                {showFeedbackActions && feedbackOptions?.allowComments && onQuickComment && (
                   <button
                     className="p-2 bg-white/90 rounded-full hover:bg-white transition-colors"
                     onClick={(e) => {

frontend/src/components/gallery/layouts/MasonryGalleryLayout.tsx

@@ -117,7 +117,7 @@ const MasonryPhoto: React.FC<MasonryPhotoProps> = ({
                 <Download className="w-5 h-5 text-neutral-800" />
               </button>
             )}
-            {onQuickComment && (
+            {feedbackEnabled && feedbackOptions?.allowComments && onQuickComment && (
               <button
                 className="p-2 bg-white/90 rounded-full hover:bg-white transition-colors"
                 onClick={(e) => { e.stopPropagation(); onQuickComment(); }}
@@ -127,7 +127,7 @@ const MasonryPhoto: React.FC<MasonryPhotoProps> = ({
                 <MessageSquare className="w-5 h-5 text-neutral-800" />
               </button>
             )}
-            {feedbackOptions?.allowLikes && (
+            {feedbackEnabled && feedbackOptions?.allowLikes && (
               <button
                 className="p-2 bg-white/90 rounded-full hover:bg-white transition-colors"
                 onClick={async (e) => {