- voice_recorder: compressor config API (max_gain, lookback, lookahead, rise_rate, target_level)
- bridge/JNI: compressor_config export
- AudioRecorderManager: startMicTest/stopMicTest for level preview
- SettingsScreen: TabRow with Settings + Audio tabs
- Audio tab: mic test with live level bar, Opus preset selector, 5 compressor sliders matching desktop