- Add a reactive useColorModel API for format state, channel edits, Reka bridges, and slider presentation
- Move the app color panel and ColorInputRoot onto the shared model and remove superseded picker helpers
- Document the public contract and cover precise RGB plus OkHCL intent round trips
- Add selection mask commands, shortcuts, context-menu access, and mask type controls
- Add mixed-selection blend mode editing with single-step undo
- Document the headless mask composable and localize the new controls
