feat: photo multiselect, move/copy, trash and compact chrome

- backend: soft delete + trash (photos.deleted_at, migration 000005), GET /trash, restore, permanent delete with storage-key refcount (S3 objects removed only when no other album references them); batch endpoints photo-batch/{delete,move,copy} - metadata only, copies clone rows sharing storage keys
- frontend: Ctrl/Shift multiselect; right-panel 'Действия' as icon text rows (Открыть (просмотр), Переместить, Копировать, Удалить); drag selected photos onto rail album -> TransferDialog; /trash route; trash entry as last item in the left rail; empty right panel hidden on overview
- frontend: compact top bars (app header and viewer), compact theme switcher
- openspec: sync lightroom-workspace-ui artifacts (photos/ui-workspace specs, design #20-24, tasks 9.11-9.17)

frontend/src/routes/(app)/albums/[id]/+page.svelte

@@ -131,6 +131,45 @@
 		}
 	}
 
+	function selectPhoto(i: number, e: MouseEvent) {
+		const photo = photos[i];
+		if (!photo) return;
+		const cur = selection.albumId === albumId ? selection.items : [];
+		if (e.shiftKey && selection.anchorId && selection.albumId === albumId) {
+			const a = photos.findIndex((p) => p.id === selection.anchorId);
+			if (a >= 0) {
+				const lo = Math.min(a, i);
+				const hi = Math.max(a, i);
+				selection.set(albumId, photos.slice(lo, hi + 1));
+				return;
+			}
+		}
+		if (e.ctrlKey || e.metaKey) {
+			const exists = cur.some((p) => p.id === photo.id);
+			selection.set(
+				albumId,
+				exists ? cur.filter((p) => p.id !== photo.id) : [...cur, photo]
+			);
+			selection.anchorId = photo.id;
+			return;
+		}
+		selection.set(albumId, [photo]);
+		selection.anchorId = photo.id;
+	}
+
+	function dragPhoto(i: number, e: DragEvent) {
+		const photo = photos[i];
+		if (!photo) return;
+		if (!(selection.albumId === albumId && selection.has(photo.id))) {
+			selection.set(albumId, [photo]);
+			selection.anchorId = photo.id;
+		}
+		const ids = selection.ids;
+		e.dataTransfer?.setData('application/x-galo-photos', JSON.stringify(ids));
+		e.dataTransfer?.setData('text/plain', `${ids.length} фото`);
+		if (e.dataTransfer) e.dataTransfer.effectAllowed = 'copyMove';
+	}
+
 	function onDrop(ev: DragEvent) {
 		ev.preventDefault();
 		dragging = false;
@@ -151,6 +190,7 @@
 		aria-label="Альбом"
 		ondragover={(e) => {
 			if (!canUpload) return;
+			if (!e.dataTransfer?.types.includes('Files')) return;
 			e.preventDefault();
 			dragging = true;
 		}}
@@ -202,11 +242,9 @@
 			{:else}
 				<PhotoGrid
 					{photos}
-					selectedId={selection.albumId === albumId ? (selection.photo?.id ?? null) : null}
-					onSelect={(i) => {
-						const p = photos[i];
-						if (p) selection.select(albumId, p);
-					}}
+					selectedIds={selection.albumId === albumId ? selection.ids : []}
+					onSelect={selectPhoto}
+					onDragStart={dragPhoto}
 					onOpen={(i) => {
 						const p = photos[i];
 						if (p) goto(`/albums/${albumId}/photos/${p.id}`);