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/AlbumCard.test.ts

@@ -3,6 +3,7 @@ import { render, screen, fireEvent } from '@testing-library/svelte';
 import type { AlbumRef, AlbumDetail, TrackRef } from '$lib/api/types';
 import { FALLBACK_COVER } from '$lib/media/covers';
 import { emptyLikesMock } from '../../test-utils/mocks/likes';
+import { makeTrack } from '$test-utils/fixtures/track';
 
 vi.mock('$lib/api/client', () => ({
   api: { get: vi.fn() }
@@ -80,13 +81,12 @@ describe('AlbumCard', () => {
 
   test('+ queue button fetches album detail and calls enqueueTracks', async () => {
     const tracks: TrackRef[] = [
-      {
-        id: 't1', title: 'So What',
+      makeTrack({
+        title: 'So What',
         album_id: 'xyz', album_title: 'Kind of Blue',
         artist_id: 'm-davis', artist_name: 'Miles Davis',
-        track_number: 1, disc_number: 1, duration_sec: 545,
-        stream_url: '/api/tracks/t1/stream'
-      }
+        duration_sec: 545
+      })
     ];
     const detail: AlbumDetail = { ...album, tracks };
     (api.get as ReturnType<typeof vi.fn>).mockResolvedValueOnce(detail);
@@ -102,11 +102,12 @@ describe('AlbumCard', () => {
 
   test('play overlay click fetches album detail and calls playQueue at index 0', async () => {
     const tracks: TrackRef[] = [
-      { id: 't1', title: 'So What',
+      makeTrack({
+        title: 'So What',
         album_id: 'xyz', album_title: 'Kind of Blue',
         artist_id: 'm-davis', artist_name: 'Miles Davis',
-        track_number: 1, disc_number: 1, duration_sec: 545,
-        stream_url: '/api/tracks/t1/stream' }
+        duration_sec: 545
+      })
     ];
     const detail: AlbumDetail = { ...album, tracks };
     (api.get as ReturnType<typeof vi.fn>).mockResolvedValueOnce(detail);