**Regression fix**: when synthesis of segment N+1 ran longer than the
playback of segment N (e.g. 5 s synth for a 1.5 s "Bonjour !"), the
previous MediaPlayer was already in the Completed state by the time
we queued the next one. setNextMediaPlayer() on a Completed player is
a documented silent no-op — so the second sentence never started and
the user only heard the first part of the reply.
Rewrote playChainedMediaPlayers with per-player CompletableDeferred
tracking: before calling setNext we check whether current's done has
fired; after awaiting completion we verify next really auto-started
(checking isPlaying / currentPosition) and call start() explicitly if
the chain missed. Belt-and-suspenders against the race either way.
Removed the now-unused waitForPlaybackCompletion helper.
**Visual change**: in-sphere spectrum bars replaced with three
superimposed Bézier "deforming lines", mirrored above/below a central
baseline, with a soft cosine taper so the curves decay to zero at the
sphere's left/right edges (matches the circular mask). Each line has
its own slow-moving phase + gain + thickness + alpha so the three
overlap to give depth — closer to an oscilloscope trace than an EQ.
Low-level sin jitter keeps the lines alive during quiet passages,
amplitude-gated so true silence is a flat line.
User-facing change: no bars anymore. The sphere now "breathes" with
flowing waveforms matching its voice.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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