feat(web): player bar, playable track lists and Collection (M3)

- player bar with cover, like and dislike, previous / play / next,
  shuffle, repeat, seek bar and volume; PlayerProvider lives with the
  signed-in shell and restores the last track and position paused
- clicking a row (or Enter) plays the list from that track with its
  context (album, search, history, collection); the current track is
  highlighted and rows have a like button; a reaction refreshes lists
- Collection: history grouped by day with clearing, likes with "play
  all" and dislikes, all with paging; sidebar section
- events and playback state are flushed when the page is hidden;
  player timers survive StrictMode remounts

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/App.test.tsx

@@ -245,6 +245,46 @@ describe('search box', () => {
   });
 });
 
+describe('player', () => {
+  it('plays an album from a clicked row, likes and pauses with the keyboard', async () => {
+    const alice = makeUser('alice', 'user');
+    const { user, api } = await renderApp([alice], '/album/00000000-0000-4000-8000-0000000000bb', { signedInAs: alice });
+
+    const row = (await screen.findByText('Закрой за мной дверь')).closest('[role="row"]')!;
+    await user.click(row);
+    const bar = screen.getByRole('contentinfo', { name: 'Плеер' });
+    await waitFor(() => expect(within(bar).getByText('Закрой за мной дверь')).toBeInTheDocument());
+    expect(row).toHaveAttribute('aria-current', 'true');
+    expect(within(bar).getByRole('button', { name: 'Пауза' })).toBeInTheDocument();
+
+    await user.click(within(bar).getByRole('button', { name: 'Нравится' }));
+    await waitFor(() =>
+      expect(api.calls).toContainEqual({
+        method: 'PUT',
+        path: '/api/v1/me/reactions/tracks/00000000-0000-4000-8000-000000000101',
+        body: { reaction: 'like' },
+      }),
+    );
+    expect(within(bar).getByRole('button', { name: 'Убрать из лайков' })).toHaveAttribute('aria-pressed', 'true');
+
+    // Пробел на кнопке нажимает её саму; горячая клавиша работает, когда фокус не на элементе управления.
+    (document.activeElement as HTMLElement).blur();
+    await user.keyboard(' ');
+    expect(within(bar).getByRole('button', { name: 'Слушать' })).toBeInTheDocument();
+
+    // Уход со страницы досылает события и сохраняет состояние плеера.
+    window.dispatchEvent(new Event('pagehide'));
+    await waitFor(() => {
+      const sent = api.calls.filter((c) => c.path === '/api/v1/events').flatMap((c) => (c.body as { events: { type: string; context_type?: string }[] }).events);
+      expect(sent.find((e) => e.type === 'play_start')).toMatchObject({ context_type: 'album' });
+    });
+    expect(api.calls.find((c) => c.method === 'PUT' && c.path === '/api/v1/me/playback-state')?.body).toMatchObject({
+      track_id: '00000000-0000-4000-8000-000000000101',
+      queue_index: 1,
+    });
+  });
+});
+
 describe('safeRedirect', () => {
   it.each([
     ['/settings', '/settings'],