chore: import upstream snapshot with attribution

examples/integrations/langgraph-python/src/components/headless-chat.tsx

@@ -0,0 +1,37 @@
+import { useAgent } from "@copilotkit/react-core/v2";
+import { useCallback, useState } from "react";
+
+export const HeadlessChat = () => {
+  const { agent } = useAgent();
+  const [message, setMessage] = useState("");
+
+  const sendMessage = useCallback(
+    (message: string) => {
+      agent.addMessage({
+        role: "user",
+        id: crypto.randomUUID(),
+        content: message,
+      });
+      agent.runAgent();
+      setMessage("");
+    },
+    [agent],
+  );
+
+  return (
+    <div>
+      <h1>Chat</h1>
+      {agent.messages.map((message) => (
+        <div key={message.id}>
+          <p>{JSON.stringify(message.content)}</p>
+        </div>
+      ))}
+      <input
+        type="text"
+        value={message}
+        onChange={(e) => setMessage(e.target.value)}
+      />
+      <button onClick={() => sendMessage(message)}>Send</button>
+    </div>
+  );
+};