feat(web): My Wave button, mood picker and endless wave playback (M4)

- WaveButton: TypeScript port of the prototype's canvas animation
  (orb and liquid), breathing at rest, pulsing to the track's BPM and
  energy in the cover palette, following the cursor, pressing with a
  spring; reduced motion and hidden tabs slow or stop it
- home: the wave in the centre with activity and mood chips; changing
  them while playing rebuilds the upcoming tracks without stopping
- player wave mode: asks for the next batch when two tracks are left,
  sends complete / skip / early skip / like / dislike as feedback and
  refreshes the queue right after a reaction or an early skip
- tracks expose bpm, energy and loudness once analysed; library page
  shows analysis progress and 7-day wave metrics; wave style setting

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

apps/web/src/test/setup.ts

@@ -17,3 +17,6 @@ Object.defineProperty(HTMLMediaElement.prototype, 'pause', {
   },
 });
 Object.defineProperty(HTMLMediaElement.prototype, 'load', { configurable: true, value() {} });
+
+// Canvas в jsdom нет: кнопка волны без контекста просто не рисует (как в старых браузерах).
+Object.defineProperty(HTMLCanvasElement.prototype, 'getContext', { configurable: true, value: () => null });