Revert WebSocket handling to simpler approach

- Go back to attaching WebSocketServer directly with path option
- Remove manual upgrade event handling that was causing errors
- The path option should filter to only /ws/script-execution
- Next.js should handle its own HMR WebSocket upgrades naturally

server.js

@@ -79,16 +79,15 @@ class ScriptExecutionHandler {
    * @param {import('http').Server} server
    */
   constructor(server) {
-    // Create WebSocketServer without attaching to server
+    // Create WebSocketServer attached to server with path filter
-    // We'll handle upgrades manually to avoid interfering with Next.js HMR
+    // The path option should ensure it only handles /ws/script-execution
     this.wss = new WebSocketServer({ 
-      noServer: true,
+      server,
       path: '/ws/script-execution'
     });
     this.activeExecutions = new Map();
     this.db = getDatabase();
     this.setupWebSocket();
-    this.server = server;
   }
 
   /**
@@ -1188,23 +1187,6 @@ app.prepare().then(() => {
 
   // Create WebSocket handlers
   const scriptHandler = new ScriptExecutionHandler(httpServer);
-  
-  // Manually handle upgrade events to ensure Next.js HMR WebSocket works
-  // We handle /ws/script-execution ourselves and pass everything else to Next.js
-  httpServer.on('upgrade', (request, socket, head) => {
-    const parsedUrl = parse(request.url || '', true);
-    const { pathname } = parsedUrl;
-    
-    if (pathname === '/ws/script-execution') {
-      // Handle our custom WebSocket endpoint
-      scriptHandler.wss.handleUpgrade(request, socket, head, (ws) => {
-        scriptHandler.wss.emit('connection', ws, request);
-      });
-    } else {
-      // Pass all other WebSocket upgrades (including Next.js HMR) to Next.js handler
-      handle(request, socket, head);
-    }
-  });
   // Note: TerminalHandler removed as it's not being used by the current application
 
   httpServer