统一页面右上角操作区（05-31-unified-page-header-actions）

client/src/components/patterns/ListWorkspace.tsx

@@ -33,6 +33,10 @@ export function WorkspaceHeader({ eyebrow, title, subtitle, meta, actions, class
   );
 }
 
+export function HeaderActionGroup({ className, children }: WorkspaceChildrenProps) {
+  return <div className={cn("flex flex-wrap items-center justify-end gap-2", className)}>{children}</div>;
+}
+
 export function FilterBar({ className, children }: WorkspaceChildrenProps) {
   return <section className={cn("card-std p-3 md:p-3.5", className)}>{children}</section>;
 }