Let a button press cut the current reply (barge-in)

Every press bumps a turn counter and kills the running aplay; queued
audio from an older turn is dropped, and reply() now runs on its own
thread and returns once its turn is stale, so the button loop is never
blocked. A cut-off exchange is left out of history so user and
assistant messages still alternate.

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

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