- Bump capture preview resolution from 480×360 to 960×540 (HD)
- Increase preview FPS from 2 to ~12 FPS (AUX_INTERVAL 0.5→0.08)
- Add accent-color border on screen rect only (not LED edges) via ::after
- Use dynamic aspect-ratio from decoded JPEG frames instead of fixed height
- Widen modal to 900px for picture sources
- Move frontend conventions from CLAUDE.md to contexts/frontend.md
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
