replace chat polling with websocket

web/lib/chatSocket.js

@@ -0,0 +1,16 @@
+import { Client } from "@stomp/stompjs";
+
+const BACKEND_URL = process.env.NEXT_PUBLIC_BACKEND_URL || "";
+
+export function createStompClient(token) {
+  return new Client({
+    webSocketFactory: () => {
+      const SockJS = require("sockjs-client");
+      return new SockJS(`${BACKEND_URL}/ws/chat-sockjs`);
+    },
+    connectHeaders: { Authorization: `Bearer ${token}` },
+    reconnectDelay: 5000,
+    heartbeatIncoming: 10000,
+    heartbeatOutgoing: 10000,
+  });
+}