fix(ui): propagate photo tag edits to grid and viewer

Add a shared photo-updates signal the panel publishes on rename or tag
add/remove; the album grid and viewer subscribe and patch the changed
photo into their lists, so the 360 badge and panorama mode update without
a reload.

frontend/src/lib/components/AlbumPanel.svelte

@@ -9,6 +9,7 @@
 	import PhotoPanel from './PhotoPanel.svelte';
 	import { albums } from '$lib/stores/albums.svelte';
 	import { selection } from '$lib/stores/selection.svelte';
+	import { photoUpdates } from '$lib/stores/photo-updates.svelte';
 	import { transfer } from '$lib/stores/transfer.svelte';
 	import type { Album, Photo } from '$lib/types';
 
@@ -52,6 +53,7 @@
 	function onRenamed(updated: Photo) {
 		photo = updated;
 		if (selectedItems.some((p) => p.id === updated.id)) selection.replace(updated);
+		photoUpdates.publish(updated);
 	}
 
 	function onDeleted() {

frontend/src/lib/stores/photo-updates.svelte.ts

@@ -0,0 +1,11 @@
+import type { Photo } from '$lib/types';
+
+class PhotoUpdatesStore {
+	latest = $state<Photo | null>(null);
+
+	publish(photo: Photo) {
+		this.latest = photo;
+	}
+}
+
+export const photoUpdates = new PhotoUpdatesStore();