fix(photos): delete photo uses local event metadata, not a missing GET route

The deletePhoto function fetched /api/events/:id which has no GET handler
(404). This gave undefined metadata, so the PATCH would set metadata to
{photo: null} only, losing other fields — and on a 404 it likely didn't
execute correctly at all. Now reads metadata from the already-loaded
allEvents array and deletes the photo key before PATCHing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/(app)/photos/page.tsx

@@ -69,13 +69,13 @@ export default function PhotosPage() {
   const current = lightbox ? lightbox.events[lightbox.index] : null;
 
   async function deletePhoto(eventId: string) {
-    const res = await fetch(`/api/events/${eventId}`);
+    const ev = allEvents.find((e) => e.id === eventId);
-    const ev = await res.json();
+    const existingMeta: Record<string, unknown> = ev ? { ...ev.metadata } : {};
-    const existingMeta = ev.metadata ?? {};
+    delete existingMeta.photo;
     await fetch(`/api/events/${eventId}`, {
       method: "PATCH",
       headers: { "Content-Type": "application/json" },
-      body: JSON.stringify({ metadata: { ...existingMeta, photo: null } }),
+      body: JSON.stringify({ metadata: existingMeta }),
     });
     qc.invalidateQueries({ queryKey: ["photo-events", selectedBaby?.id] });
     setLightbox(null);