feat(settings): player bar layout — per-control visibility toggles (#627) (#721)

Adds a new sub-section under Settings → Personalisation (Advanced) that
hides individual controls in the player bar: Star rating, Favorite
(heart), Last.fm love, Equalizer, Mini player. Last.fm love still only
renders when a Last.fm session exists; the overflow row in the player
collapses when both Equalizer and Mini player are hidden.

- New `playerBarLayoutStore` (Zustand + persist, items[{id, visible}] +
  rehydrate sanitize) following the queueToolbar / playlistLayout
  pattern; defaults to all visible.
- New `PlayerBarLayoutCustomizer` reuses the same row + toggle pattern
  as the other personalisation customisers.
- Gates threaded through `PlayerTrackInfo` (3 controls), `PlayerBar`
  (EQ + Mini buttons), and `PlayerOverflowMenu` (EQ + Mini in the
  overflow row, with row-level conditional).
- `PersonalisationTab`: added as the last advanced sub-section so it
  only appears when the global Advanced Mode toggle is on.
- Settings search index gets entries for both Playlist page layout and
  Player bar (playlist row was missing).
- New i18n keys `settings.playerBar*` in all 9 locales.

Reuses kveld9's design from PR #627; not merged because the locale
split and the Advanced Mode refactor landed afterwards. Credited via
Co-Authored-By trailer + a new line in settingsCredits.ts under the
existing kveld9 entry.

Co-authored-by: Kveld. <kveld912@proton.me>

src/store/playerBarLayoutStore.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it, beforeEach } from 'vitest';
+import {
+  DEFAULT_PLAYER_BAR_LAYOUT_ITEMS,
+  usePlayerBarLayoutStore,
+} from './playerBarLayoutStore';
+
+describe('playerBarLayoutStore', () => {
+  beforeEach(() => {
+    usePlayerBarLayoutStore.getState().reset();
+  });
+
+  it('starts with all five items visible in declared order', () => {
+    const items = usePlayerBarLayoutStore.getState().items;
+    expect(items.map(i => i.id)).toEqual([
+      'starRating', 'favorite', 'lastfmLove', 'equalizer', 'miniPlayer',
+    ]);
+    expect(items.every(i => i.visible)).toBe(true);
+  });
+
+  it('toggleItem flips the matching id without disturbing the others', () => {
+    usePlayerBarLayoutStore.getState().toggleItem('equalizer');
+    const items = usePlayerBarLayoutStore.getState().items;
+    expect(items.find(i => i.id === 'equalizer')?.visible).toBe(false);
+    expect(items.find(i => i.id === 'starRating')?.visible).toBe(true);
+    expect(items.find(i => i.id === 'miniPlayer')?.visible).toBe(true);
+  });
+
+  it('reset restores defaults after toggles', () => {
+    const { toggleItem, reset } = usePlayerBarLayoutStore.getState();
+    toggleItem('favorite');
+    toggleItem('lastfmLove');
+    reset();
+    expect(usePlayerBarLayoutStore.getState().items).toEqual(DEFAULT_PLAYER_BAR_LAYOUT_ITEMS);
+  });
+});