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/routes/+layout.svelte

@@ -13,7 +13,9 @@
 	import { resizable } from '$lib/actions/resizable';
 	import { queryClient } from '$lib/queryClient';
 	import { startIndexerWatch, stopIndexerWatch } from '$lib/stores/indexer.svelte';
+	import { bulkAction } from '$lib/stores/bulkAction.svelte';
 	import IndexerStatusPill from '$lib/components/layout/IndexerStatusPill.svelte';
+	import StatusPill from '$lib/components/layout/StatusPill.svelte';
 	import LeftSidebar from '$lib/components/layout/LeftSidebar.svelte';
 	import AnimatedMule from '$lib/components/mule/AnimatedMule.svelte';
 	import PreviewModal from '$lib/components/preview/PreviewModal.svelte';
@@ -72,6 +74,7 @@
 		<div class="flex h-screen flex-col overflow-hidden">
 			<AnimatedMule>
 				<IndexerStatusPill />
+				<StatusPill active={bulkAction.active} label={bulkAction.label} detail={bulkAction.detail} />
 			</AnimatedMule>
 			<div class="flex min-h-0 flex-1">
 				{#if !view.leftSidebarCollapsed}