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Video files (MP4, MKV, etc.) are now processed with ffmpeg to extract audio to a temp WAV file before loading into wavesurfer. This prevents the WebView crash caused by trying to fetch multi-GB files into memory. - New extract_audio Tauri command uses ffmpeg (sidecar-bundled or system) - Frontend detects video extensions and extracts audio automatically - User-friendly error if ffmpeg is not installed with install instructions - Reverted wavesurfer MediaElement approach in favor of clean extraction - Added FFmpeg install guide to USER_GUIDE.md Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>