feat: Immich photo integration — Photos addon with sharing, filters, lightbox

- Immich connection per user (Settings → Immich URL + API Key)
- Photos addon (admin-toggleable, trip tab)
- Manual photo selection from Immich library (date filter + all photos)
- Photo sharing with consent popup, per-photo privacy toggle
- Lightbox with liquid glass EXIF info panel (camera, lens, location, settings)
- Location filter + date sort in gallery
- WebSocket live sync when photos are added/removed/shared
- Proxy endpoints for thumbnails and originals with token auth

client/src/store/slices/remoteEventHandler.ts

@@ -232,6 +232,11 @@ export function handleRemoteEvent(set: SetState, event: WebSocketEvent): void {
           files: state.files.filter(f => f.id !== payload.fileId),
         }
 
+      // Memories / Photos
+      case 'memories:updated':
+        window.dispatchEvent(new CustomEvent('memories:updated', { detail: payload }))
+        return {}
+
       default:
         return {}
     }