feat(upload): persistent "Recently uploaded" list (§A8)

The transient client-side upload queue vanished on refresh, so a just-
uploaded track seemed to disappear. Add a server-backed "Recently
uploaded" section (source=upload, newest first) that survives refresh and
auto-refreshes after each upload (the upload mutation already invalidates
the `Track` tag this query provides).

- api: `source` filter on `LibraryFilters` → `GET /tracks?source=`
- i18n: `upload.recent.*` (en + ru); loading/error/empty states

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/api/types.ts

@@ -177,6 +177,8 @@ export interface LibraryFilters {
   genre?: string;
   artistId?: string;
   albumId?: string;
+  /** Filter by ingest origin, e.g. `upload`, `youtube`, `local`. */
+  source?: string;
   liked?: boolean;
   page?: number;
   pageSize?: number;