🎨 fix(theme): align UI controls with global radius tokens

Remove hard-coded and capped border radius overrides so shared controls and feature actions consistently follow the active theme radius.

- Replace fixed radius utilities with semantic theme-aware radius tokens
- Remove redundant `rounded-full` and pixel-based overrides from header, toolbar, Playground, and utility actions
- Drop unused `StatusBadge` rounded prop usage
- Keep existing component behavior intact while improving global theme consistency

web/default/src/components/learn-more.tsx

@@ -25,7 +25,7 @@ export function LearnMore({
     <Popover {...props}>
       <PopoverTrigger
         {...triggerProps}
-        className={cn('size-5 rounded-full', triggerProps?.className)}
+        className={cn('size-5', triggerProps?.className)}
         render={<Button variant='outline' size='icon' />}
       >
         <span className='sr-only'>{t('Learn more')}</span>