v0.22.0

@kanzo-tech/ui

ThemePicker: the card is the selector. The Light · Dark segment is gone. The two cards are
now one radio group, Appearance: clicking a card anywhere but on a swatch wears its side, and the
worn card is the checked one — primary border and Active. Each card still offers only its own
side's themes, and each side still remembers its own theme.

• Pointing at a swatch previews it in that card's preview and name only; the page does not
  change, and leaving puts the card's theme back.
• Clicking a swatch commits it and wears that side: choosing a dark theme while wearing light now
  switches to dark (it used to file the theme and leave the page light).
• Keyboard: arrow keys move between the cards (and wear the side, as radios do); within a card's
  swatches they move focus and preview without choosing, Enter or Space chooses, Escape restores the
  preview.
• Policy: a pinned or hidden appearance draws only the worn side's card; a pinned or hidden theme
  draws both cards without swatches, still choosing the side.

ThemePickerCopy loses light and dark — there is no segment to label. appearance stays, as
the cards' accessible name. Drop the two keys from your copy:

 <ThemePicker
   copy={{
     appearance: "Apariencia",
-    light: "Claro",
-    dark: "Oscuro",
     day: "Tema claro",

setTheme called twice in one tick keeps both sides. It merged onto the render's snapshot, so
filing a family's light and dark themes in one handler kept only the second.