1. Session persists in GATHERING state. 2. Added inactive sessions purging, but it does not work.

backend/dist/index.js

@@ -49,6 +49,7 @@ app.post('/sessions', (req, res) => {
         responses: new Map(),
         clients: new Map(),
         finalResult: null,
+        lastActivity: Date.now(),
     });
     console.log(`New session created: ${sessionId}`);
     res.status(201).json({ sessionId });