feat: loading toasts for all photo actions

Add loading→success/error toast transition to every bulk operation
(archive, restore, delete, approve, add-to-heap, metadata patch).
Also wires gridKeyNav + CauseGroupCard into the bulkAction store so
keyboard-triggered actions show the same per-tile pending/done/error
feedback as BulkActionBar buttons.

web/src/lib/services/bulk.ts

@@ -57,10 +57,11 @@ export async function patchTargets(
 			)
 		: null;
 
+	const tid = toast.loading(`${label} · ${ids.length}…`);
+
 	const { updated, errors } = await batchEdit(ids, async (id) => {
 		const p = await freshPhoto(id);
 		const body = typeof patch === 'function' ? patch(p) : patch;
-		// An empty body is a no-op signal — e.g. "keyword already present".
 		if (Object.keys(body).length === 0) return p;
 		return updatePhoto(p, body);
 	});
@@ -68,9 +69,9 @@ export async function patchTargets(
 	invalidatePhotos(ids);
 
 	if (errors.length) {
-		toast.error(`${label} · ${updated.length} ok, ${errors.length} failed`);
+		toast.error(`${label} · ${updated.length} ok, ${errors.length} failed`, { id: tid });
 	} else {
-		toast.success(`${label} · ${ids.length}`);
+		toast.success(`${label} · ${ids.length}`, { id: tid });
 	}
 
 	if (inverses) {