feat: context menus, unified photo panel, tags, album trash and counters

- backend: deleting an album moves its photos to the trash without losing files (photos.album_id nullable, FK ON DELETE SET NULL, migration 000006; dropped S3 prefix delete); restore accepts an album target (album_required when the album is gone); user-scoped tags (000007) with GET /tags, POST/DELETE /photos/:id/tags, tags included in photo responses; GET /trash/count
- frontend: right-click context menus for photos (grid + viewer) and albums (rail + overview); single shared PhotoPanel reused in viewer and gallery selection (not a copy); viewer download/delete moved to the panel 'Действия'; transparent compact viewer top bar; trash entry as last rail item with per-album photo counts and trash count; album rename/delete dialogs
- openspec: sync lightroom-workspace-ui artifacts (specs photos/ui-workspace, design #24-30, tasks 9.17-9.24)

frontend/src/lib/components/AlbumRail.svelte

@@ -6,6 +6,10 @@
 	import { albums } from '$lib/stores/albums.svelte';
 	import { auth } from '$lib/stores/auth.svelte';
 	import { transfer } from '$lib/stores/transfer.svelte';
+	import { albumActions } from '$lib/stores/album-actions.svelte';
+	import { contextMenu, type ContextMenuItem } from '$lib/stores/context-menu.svelte';
+	import { trash } from '$lib/stores/trash.svelte';
+	import type { Album } from '$lib/types';
 
 	const activeId = $derived($page.params.id ?? '');
 	const onTrash = $derived($page.url.pathname === '/trash');
@@ -36,9 +40,24 @@
 		}
 	}
 
+	function onContextMenu(ev: MouseEvent, album: Album) {
+		ev.preventDefault();
+		ev.stopPropagation();
+		const items: ContextMenuItem[] = [
+			{ label: 'Переименовать', icon: 'edit', run: () => albumActions.openRename(album) },
+			{ label: 'Удалить', icon: 'delete', danger: true, run: () => albumActions.openDelete(album) }
+		];
+		contextMenu.show(ev.clientX, ev.clientY, items);
+	}
+
 	$effect(() => {
 		if (auth.isAuthenticated && !albums.loaded) albums.load();
 	});
+
+	$effect(() => {
+		$page.url.pathname;
+		if (auth.isAuthenticated) trash.load();
+	});
 </script>
 
 <div class="flex h-full flex-col">
@@ -79,6 +98,7 @@
 						ondragover={(e) => onDragOver(e, album.id)}
 						ondragleave={() => onDragLeave(album.id)}
 						ondrop={(e) => onDrop(e, album.id)}
+						oncontextmenu={(e) => onContextMenu(e, album)}
 					>
 						<span
 							class="bg-bg-muted border-border flex size-9 shrink-0 items-center justify-center overflow-hidden rounded border"
@@ -95,6 +115,7 @@
 							{/if}
 						</span>
 						<span class="truncate">{album.title}</span>
+						<span class="text-text-subtle ml-auto shrink-0 text-xs">{album.photos_count ?? 0}</span>
 					</a>
 				</li>
 			{/each}
@@ -116,6 +137,7 @@
 					<Icon name="delete" class="size-4 text-text-subtle" />
 				</span>
 				<span class="truncate">Корзина</span>
+				<span class="text-text-subtle ml-auto shrink-0 text-xs">{trash.count}</span>
 			</a>
 		</div>
 	{/if}