🐛 fix(remote): clean up auth timeout and client state on WebSocket error

The error handler was missing clearTimeout for the auth timeout timer
and didn't clean up authenticated client state (signaling disconnect,
destroying capture window when last client drops).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/remote-server.js

@@ -125,7 +125,20 @@ class RemoteServer {
     });
 
     ws.on('error', () => {
+      clearTimeout(authTimeout);
+      const client = this._clients.get(ws);
+      const wasAuthenticated = client && client.authenticated;
       this._clients.delete(ws);
+
+      if (wasAuthenticated) {
+        this._config.onSignalingToCapture({
+          type: 'client-disconnected',
+          clientId: client.id
+        });
+        if (this.getClientCount() === 0) {
+          this._config.onDestroyCaptureWindow();
+        }
+      }
     });
   }