final commit

server.js

@@ -1,15 +1,14 @@
-
-import express from 'express';
-import http from 'http';
-import { Server } from 'socket.io';
+import express from "express";
+import http from "http";
+import { Server } from "socket.io";
 
 const app = express();
 const server = http.createServer(app);
 const io = new Server(server, {
   cors: {
     origin: "http://localhost:5173", // allow Vite frontend
-    methods: ["GET", "POST"]
-  }
+    methods: ["GET", "POST"],
+  },
 });
 
 // Socket.IO events
@@ -20,10 +19,14 @@ io.on("connection", (socket) => {
     socket.broadcast.emit("paramUpdate", data);
   });
 
+  socket.on("pulse", () => {
+    socket.broadcast.emit("pulse");
+  });
+
   socket.on("disconnect", () => {
     console.log("Client disconnected:", socket.id);
   });
 });
 
-app.use(express.static('frontend/dist'));
-server.listen(3000, () => console.log('Server running on http://localhost'));
+app.use(express.static("frontend/dist"));
+server.listen(3000, () => console.log("Server running on http://localhost"));