🎨 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/features/models/components/dialogs/prefill-group-management-dialog.tsx

@@ -188,7 +188,7 @@ export function PrefillGroupManagementDialog({
                   <Button
                     variant='ghost'
                     size='icon'
-                    className='text-muted-foreground hover:text-foreground absolute top-4 right-4 rounded-full border border-transparent sm:top-5 sm:right-6'
+                    className='text-muted-foreground hover:text-foreground absolute top-4 right-4 border border-transparent sm:top-5 sm:right-6'
                   />
                 }
               >