Replaces the joined tonal cards with standalone Calendar-agenda pills
(leading check, title/due to the right), tuned after on-device review:
a leading checkbox with a bigger, filled add button; squished padding
with real margin between pills; light text on coloured pills for
contrast; a bare time instead of "Today · 14:00" once the due-bucket
header already says it; and a single remaining group drops its now
redundant header.
New per-widget "Row colour" setting (Neutral / By list) tints each
pill with its own list's colour instead of a flat tonal fill.
Bumps the floret-kit submodule for the WidgetGroupedRow gap fix, the
square checkbox glyph, and WidgetActionButton's height/icon-size knobs.