- Gradient stops on the canvas: drag a stop along the gradient line, click the line to add a
stop (sampled colour), the selected stop is ringed and shared with the picker; Delete removes
it (two always stay).
- Colour picker value row: a model dropdown (Hex, RGB, HSL, HSB, CSS) with its fields and the
alpha field; scrubbing works on the numeric fields.
- "On this page" swatches: the page's most used solid colours (cached per document snapshot);
swatches set a solid colour or the selected gradient stop.
- New command `paint.documentColors {page?, limit?}`; control channel `ui.set {colorPicker}`.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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