🎨 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/ai-elements/suggestion.tsx

@@ -40,7 +40,7 @@ export const Suggestion = ({
 
   return (
     <Button
-      className={cn('cursor-pointer rounded-full px-4', className)}
+      className={cn('cursor-pointer px-4', className)}
       onClick={handleClick}
       size={size}
       type='button'