fix: socket reconnect and polling fallback

frontend/src/lib/socket.ts

@@ -1,38 +1,42 @@
-import { useEffect, useRef } from 'react';
-import { io, Socket } from 'socket.io-client';
-import { useStore } from './store';
+import { useEffect, useRef } from "react";
+import { io, type Socket } from "socket.io-client";
+import { useStore } from "./store";
 
-const SOCKET_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3001';
+const SOCKET_URL =
+	typeof window !== "undefined"
+		? window.location.origin
+		: process.env.NEXT_PUBLIC_API_URL || "http://localhost:3000";
 
 export const useSocket = () => {
-  const { token, isAuthenticated } = useStore();
-  const socketRef = useRef<Socket | null>(null);
+	const { token, isAuthenticated } = useStore();
+	const socketRef = useRef<Socket | null>(null);
 
-  useEffect(() => {
-    if (isAuthenticated && token) {
-      // Connect to socket
-      socketRef.current = io(SOCKET_URL, {
-        auth: { token },
-        transports: ['websocket'],
-      });
+	useEffect(() => {
+		if (isAuthenticated && token) {
+			socketRef.current = io(SOCKET_URL, {
+				auth: { token },
+				transports: ["websocket", "polling"],
+				path: "/socket.io",
+				reconnection: true,
+			});
 
-      socketRef.current.on('connect', () => {
-        console.log('Connected to socket');
-        socketRef.current?.emit('subscribe_transactions');
-      });
+			socketRef.current.on("connect", () => {
+				console.log("Connected to socket");
+				socketRef.current?.emit("subscribe_transactions");
+			});
 
-      socketRef.current.on('connect_error', (error) => {
-        console.error('Socket connection error:', error);
-      });
+			socketRef.current.on("connect_error", (error) => {
+				console.error("Socket connection error:", error);
+			});
 
-      return () => {
-        if (socketRef.current) {
-          socketRef.current.disconnect();
-          socketRef.current = null;
-        }
-      };
-    }
-  }, [isAuthenticated, token]);
+			return () => {
+				if (socketRef.current) {
+					socketRef.current.disconnect();
+					socketRef.current = null;
+				}
+			};
+		}
+	}, [isAuthenticated, token]);
 
-  return socketRef.current;
+	return socketRef.current;
 };