feat: prefetch audio during Scan All, fix file-switch interruption, fix Windows setup
- Prefetch next video's audio while GPU processes current embeddings - Don't cancel Scan All when switching files in playlist - Windows setup script now creates venv, installs PyTorch + requirements - 8cut.bat auto-detects venv Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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