fix: T16 verification cleanups

- golangci-lint: errcheck on resp.Body.Close in Lidarr client + revive
  unused-parameter in delete_test.go
- coverage: 2 error-branch tests added to lidarrquarantine.Service
  (DeleteFile + DeleteViaLidarr track-not-found paths) bring per-package
  coverage to 81.4% (target >=80%)
- search/tracks.test.ts: same TrackMenu name-collision fix T13 applied to
  TrackRow.test.ts — exact-string button match instead of regex

internal/lidarr/delete.go

@@ -64,6 +64,6 @@ func (c *Client) DeleteAlbum(ctx context.Context, lidarrAlbumID int, deleteFiles
 	if err != nil {
 		return err
 	}
-	resp.Body.Close()
+	_ = resp.Body.Close()
 	return nil
 }

internal/lidarr/delete_test.go

@@ -203,7 +203,7 @@ func TestDeleteAlbum_NetworkErrorReturnsErrUnreachable(t *testing.T) {
 }
 
 func TestDeleteAlbum_ZeroIDRejected(t *testing.T) {
-	c, srv := newTestClient(func(w http.ResponseWriter, _ *http.Request) {
+	c, srv := newTestClient(func(_ http.ResponseWriter, _ *http.Request) {
 		t.Error("server should not be called with zero id")
 	})
 	defer srv.Close()

internal/lidarr/lookup_mbid.go

@@ -18,7 +18,7 @@ func (c *Client) LookupArtistByMBID(ctx context.Context, mbid string) (LidarrArt
 	if err != nil {
 		return LidarrArtist{}, err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	var rows []LidarrArtist
 	if err := json.NewDecoder(resp.Body).Decode(&rows); err != nil {
@@ -41,7 +41,7 @@ func (c *Client) LookupAlbumByMBID(ctx context.Context, mbid string) (LidarrAlbu
 	if err != nil {
 		return LidarrAlbum{}, err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	var rows []LidarrAlbum
 	if err := json.NewDecoder(resp.Body).Decode(&rows); err != nil {

internal/lidarrquarantine/service_test.go

@@ -491,3 +491,44 @@ func TestDeleteViaLidarr_LidarrAlbumNotFound(t *testing.T) {
 		t.Errorf("err = %v, want ErrLidarrAlbumNotFound", err)
 	}
 }
+
+func TestDeleteFile_TrackNotFound(t *testing.T) {
+	pool := newPool(t)
+	user := seedUser(t, pool, "alice")
+	var bogus pgtype.UUID
+	bogus.Bytes = [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
+	bogus.Valid = true
+
+	svc := NewService(pool, lidarrconfig.New(pool), nil)
+	_, err := svc.DeleteFile(context.Background(), bogus, user.ID)
+	if !errors.Is(err, ErrTrackNotFound) {
+		t.Errorf("err = %v, want ErrTrackNotFound", err)
+	}
+}
+
+func TestDeleteViaLidarr_TrackNotFound(t *testing.T) {
+	pool := newPool(t)
+	user := seedUser(t, pool, "alice")
+
+	stub := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+	t.Cleanup(stub.Close)
+	cfg := lidarrconfig.New(pool)
+	if err := cfg.Save(context.Background(), lidarrconfig.Config{
+		Enabled: true, BaseURL: stub.URL, APIKey: "k",
+	}); err != nil {
+		t.Fatalf("save config: %v", err)
+	}
+	clientFn := func() *lidarr.Client { return lidarr.NewClient(stub.URL, "k") }
+	svc := NewService(pool, cfg, clientFn)
+
+	var bogus pgtype.UUID
+	bogus.Bytes = [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
+	bogus.Valid = true
+
+	_, _, err := svc.DeleteViaLidarr(context.Background(), bogus, user.ID)
+	if !errors.Is(err, ErrTrackNotFound) {
+		t.Errorf("err = %v, want ErrTrackNotFound", err)
+	}
+}

web/src/routes/search/tracks/tracks.test.ts

@@ -35,6 +35,13 @@ vi.mock('@tanstack/svelte-query', async (orig) => {
   return { ...actual, useQueryClient: () => ({}) };
 });
 
+vi.mock('$lib/api/quarantine', () => ({
+  flagTrack: vi.fn(),
+  unflagTrack: vi.fn(),
+  listMyQuarantine: vi.fn().mockResolvedValue([]),
+  createMyQuarantineQuery: vi.fn()
+}));
+
 import TracksOverflow from './+page.svelte';
 import { createSearchTracksInfiniteQuery } from '$lib/api/queries';
 import { playRadio } from '$lib/player/store.svelte';
@@ -62,7 +69,7 @@ describe('search tracks overflow', () => {
       mockInfiniteQuery({ pages: [page([track], 1)] })
     );
     render(TracksOverflow);
-    expect(screen.getByRole('button', { name: /So What/ })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'So What' })).toBeInTheDocument();
   });
 
   test('clicking a track row triggers playRadio with the track id', async () => {
@@ -70,7 +77,7 @@ describe('search tracks overflow', () => {
       mockInfiniteQuery({ pages: [page([track], 1)] })
     );
     render(TracksOverflow);
-    await fireEvent.click(screen.getByRole('button', { name: /So What/ }));
+    await fireEvent.click(screen.getByRole('button', { name: 'So What' }));
     expect(playRadio).toHaveBeenCalledWith('t1');
   });