refactor(web): sweep 24 test files to use makeTrack/makeTracks fixtures (#375)

Replaces inline TrackRef literal redefinitions with calls to the
test-utils helper. Tests that asserted on default field values
(e.g. track titles, artist names rendered in the DOM) keep explicit
overrides; tests that only need a stub for shape now use makeTrack()
with no overrides.

PlaylistCard.test.ts, PlaylistTrackRow.test.ts, and playlist.test.ts
SKIPPED — they use PlaylistTrack (with track_id/added_at), not TrackRef.
ArtistCard.svelte and +page.svelte route files (matched by initial grep)
SKIPPED — live code, not test files.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/lib/components/TrackMenu.test.ts

@@ -3,7 +3,7 @@ import { render, screen, fireEvent, waitFor } from '@testing-library/svelte';
 import { readable } from 'svelte/store';
 import { emptyLikesMock } from '../../test-utils/mocks/likes';
 import { emptyQuarantineMock } from '../../test-utils/mocks/quarantine';
-import type { TrackRef } from '$lib/api/types';
+import { makeTrack } from '$test-utils/fixtures/track';
 
 // Mutable mock-user handle so individual tests can flip is_admin / null
 // without re-importing the module under test.
@@ -44,16 +44,7 @@ vi.mock('$lib/player/store.svelte', () => ({
 import TrackMenu from './TrackMenu.svelte';
 import { playNext, enqueueTrack } from '$lib/player/store.svelte';
 
-const track: TrackRef = {
-  id: 't1',
-  title: 'Roygbiv',
-  album_id: 'a1',
-  album_title: 'Geogaddi',
-  artist_id: 'ar1',
-  artist_name: 'Boards of Canada',
-  duration_sec: 240,
-  stream_url: '/api/tracks/t1/stream'
-};
+const track = makeTrack({ title: 'Roygbiv' });
 
 afterEach(() => {
   vi.clearAllMocks();