feat(app): add VAD preprocessing via FluidAudio Silero v6#76
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Voice Activity Detection removes silence before transcription, improving accuracy and speed for recordings with significant pauses. Uses FluidAudio's Silero VAD v6 model (CoreML/ANE) to detect speech regions, then: - Extracts speech-only audio for transcription - Remaps timestamps back to original timeline New types: SpeechRegion, VadSegmentMap (pure, testable), FluidVAD (wrapper). Settings: vadEnabled (default off), vadThreshold (0.3–0.9 slider). Pipeline: single-source path preprocesses with VAD when enabled. Inspired by @execsumo's work in #70.
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This was referenced Apr 1, 2026
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Summary
SpeechRegion,VadSegmentMap(pure, testable),FluidVAD(wrapper)vadEnabled(default off),vadThreshold(0.3–0.9 slider)Inspired by @execsumo's work in #70.
Test plan