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

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');
   });