* feat(ui): introduce cross-platform color picker
* feat(terminal): map a press's click count to its selection granularity
* fix(editor): drag multi-click selections by word or line, kill to line end, and hide the caret over a selection
* fix(editor): triple-click selects the logical line, not the whole part
* fix(editor): keep anchors in the shown document's coordinates so source mode paints them
* feat(markdown)!: carry click granularity on selectable Pointer::Down
* fix(ui): square the color picker's field so its layers do not bleed at the corners
* chore: changelog for 0.2.6