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/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)
+	}
+}