feat(gallery): always-visible feedback indicators on grid tiles; fallback image rendering in lightbox/hero; auto-auth from shared-link token; fix external photo resolver\n\n- GridGallery: bottom-left icons for like/rated/comment on every tile\n- Hero layout grid: added same indicators (non-intrusive icons)\n- Lightbox/Hero: add fallbackSrc to display thumbnail if original fails\n- GalleryAuth: auto-store token from /gallery/:slug/:token and hydrate event\n- Backend gallery photo route: use resolvePhotoFilePath for external-media\n\nfix(admin): move photo feedback badges to bottom-right on admin grid tiles\n\nfix(dashboard): add missing i18n keys for activity types + fallback to formatter\n\nfix(admin/feedback): correct thumbnail URL base + robust date parsing\n\nRefs: #19

frontend/src/components/admin/FeedbackModerationPanel.tsx

@@ -132,7 +132,7 @@ export const FeedbackModerationPanel: React.FC<FeedbackModerationPanelProps> = (
                           <div className="mt-2 flex items-center gap-2">
                             <div className="w-16 h-16 overflow-hidden rounded">
                               <AdminAuthenticatedImage 
-                                src={`/api/admin/photos/${eventId}/thumbnail/${item.photo_id}`}
+                                src={`/admin/photos/${eventId}/thumbnail/${item.photo_id}`}
                                 alt={item.filename || 'Photo'}
                                 className="w-16 h-16 object-cover rounded"
                               />