The kit draws in one shadow DOM host in the active theme's colors, corners and font and repaints
live; accessible dialogs (focus trap and return, Esc/Enter rules, alertdialog for alerts and
confirms), stacking with inert, toasts with actions, reduced motion, text-only content (ui.h),
and scope.ui closes a plugin's dialogs on dispose. api.toast routes to it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
