initial: standalone repo from monorepo split

src/components/ui/page-header.tsx

@@ -0,0 +1,19 @@
+interface PageHeaderProps {
+  title: string;
+  description?: string;
+  action?: React.ReactNode;
+}
+
+export function PageHeader({ title, description, action }: PageHeaderProps) {
+  return (
+    <div className="flex items-start justify-between">
+      <div>
+        <h1 className="text-xl font-bold text-surface-900 dark:text-surface-100">{title}</h1>
+        {description && (
+          <p className="mt-1 text-sm text-surface-500 dark:text-surface-400">{description}</p>
+        )}
+      </div>
+      {action && <div>{action}</div>}
+    </div>
+  );
+}