Fix warnings and update tracability

src/lib/components/library/TrackList.test.ts

@@ -332,8 +332,6 @@ describe.skip("TrackList", () => {
       // NOTE: This test is skipped because stream URLs are no longer fetched by frontend.
       // The code now uses player_play_tracks which sends trackIds to backend.
       // Backend handles all stream URL generation, so this error path no longer exists.
-
-      alertSpy.mockRestore();
     });
   });