Update app.py

app.py

@@ -2182,7 +2182,7 @@ def create_enhanced_demo_interface():
             const minutes = Math.floor(diff / 60);
             const seconds = diff % 60;
             document.getElementById('live-timer').textContent = 
-                `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
+                minutes.toString().padStart(2, '0') + ':' + seconds.toString().padStart(2, '0');
         }}
         setInterval(updateTimer, 1000);
         updateTimer();