feat(playground): add AI bot layout with suspense fallback

src/app/(app)/problems/[id]/@ai/@bot/layout.tsx

@@ -0,0 +1,16 @@
+import { Suspense } from "react";
+import { Loading } from "@/components/loading";
+
+interface AiBotLayoutProps {
+  children: React.ReactNode;
+}
+
+export default function AiBotLayout({
+  children,
+}: AiBotLayoutProps) {
+  return (
+    <Suspense fallback={<Loading />}>
+      {children}
+    </Suspense>
+  );
+}