refactor: use `snapshot` for `RnColorSetter` and `RnColorPad` instead of css#1633

Draft

Doublonmousse wants to merge 8 commits intoflxzt:mainfrom

Doublonmousse:css_snapshot

Commits on Jan 16, 2026

Commits on Jan 17, 2026

`RnColorSetter` : remove unwraps for animations and add `ANIMATION_TIME_MS` constant
Doublonmousse
committed
`RnColorPad` : use `snapshot` for drawing
Doublonmousse
committed

Commits on Jan 31, 2026

add borders to colorsetters
Doublonmousse
committed

Commits on Apr 6, 2026

Use `WidgetExt::color` method to query foreground color (for `colorpad.rs`)
Doublonmousse
committed
make the checkboard color depend on the dark/light mode status
Doublonmousse
committed
`colorsetter.rs`: redraw upon dark/light color scheme change
Doublonmousse
committed