The colour popup now has five pages like the reference panel: the
wheel, a saturation/value square with a hue strip, and RGB, HSV and HSL
sliders whose tracks show the colour they would pick. A footer holds
the old/new colour swatch (tapping the old half restores it), a hex
field and a Copy button. Grey colours keep their hue across pages.
On tablets the menu gains a Color submenu with the colour commands and
lightness presets, and Settings lists the Color menu.
Painter gains a linear gradient fill, Slider an optional gradient track
and Widgets a ColorSquare.
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