feat: bulk action progress — header pill + per-thumbnail states

- New bulkAction store: tracks active/label/detail state for the pill
  and a Map<uid, pending|done|error> for per-tile overlays
- Extract StatusPill.svelte from IndexerStatusPill (generic active/label/detail
  props); IndexerStatusPill becomes a one-line wrapper
- +layout.svelte: render a second StatusPill driven by bulkAction store,
  alongside the indexer pill in the AnimatedMule header
- BulkActionBar: extend withBusy with optional BulkConfig (ids/label/doneLabel);
  pending tiles dim + spinner on start, green checkmark flashes for 400ms before
  cache invalidation removes them; red overlay on error, auto-clears after 2s
- onApprove/batchEdit: wire onProgress callback to setDetail so the pill shows
  the filename currently being processed during fan-out keep operations
- batch.ts: add completedId as third arg to onProgress (backwards-compatible)
- PhotoTile: derive bulkState from store; pending/done/error overlays sit above
  the selection tint; hover-video guarded against pending tiles

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

web/src/lib/services/batch.ts

@@ -13,7 +13,7 @@ export interface BatchResult<T> {
 
 export interface BatchOptions {
 	concurrency?: number;
-	onProgress?: (done: number, total: number) => void;
+	onProgress?: (done: number, total: number, completedId: string) => void;
 }
 
 export async function batchEdit<T>(
@@ -38,7 +38,7 @@ export async function batchEdit<T>(
 				errors.push({ id, message: err instanceof Error ? err.message : String(err) });
 			} finally {
 				done++;
-				opts.onProgress?.(done, ids.length);
+				opts.onProgress?.(done, ids.length, id);
 			}
 		}
 	}