feat: YOLO subject tracking for per-clip crop centering, fix end-frame preview

- Track subject checkbox: auto-adjusts crop center per sub-clip using
  YOLOv8-nano detection on each start frame
- Detects target nearest to user's crop click, follows same class across clips
- Graceful fallback when ultralytics not installed or detection fails
- Fix end-frame preview not updating on clip/spread change (retry on busy grabber)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
2026-04-13 15:12:17 +02:00
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commit 703874721b
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PyQt6>=6.4
python-mpv>=1.0
pytest>=7.0
ultralytics>=8.0