Replace the fixed 5-min rotation with end-driven shuffle: each track plays through,
and a short crossfade a few seconds before it ends rolls a random OTHER track
(pickNextIndex, no immediate repeat) — so Music is always playing while selected.
An 'ended' handler is the safety net (short track / missed timeupdate) and a
watchdog resumes an unexpectedly-paused active track. Crossfade injectable via
window.__hefMusicXfadeMs. music-playlist.spec.ts reworked to the end-driven model.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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