- Add POST /api/v1/picture-targets/{target_id}/test endpoint for single-frame
color extraction preview on Key Colors targets
- Add test button on KC target cards that opens lightbox with spinner,
displays captured frame with rectangle overlays and color swatches
- Add API docs link in WebUI header
- Swap confirm dialog button colors (No=red, Yes=neutral)
- Remove type badges from WLED and KC target cards
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>