frame_samples was immutable — when adaptive quality switched from 20ms
(Opus24k, 960 samples) to 40ms (Opus6k, 1920 samples), the send loop
kept reading 960 samples and feeding half-sized frames to the encoder.
This caused Opus6k to produce ~11 frames/s instead of 25, making audio
choppy.
Fix:
- frame_samples is now mut and updated on profile switch
- buf sized for max frame (1920) with frame_samples-bounded slices
- RMS, mute, encode, and capture reads all use &buf[..frame_samples]
- Applied to both Android and desktop send tasks
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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