feat: Implement dynamic video quality selection and mid-stream source switching, improve viewer connection handling by closing old connections, and optimize broadcaster notifications.

public/viewer.js

@@ -15,6 +15,11 @@ const config = {
 };
 
 socket.on('offer', (id, description) => {
+    // Close any existing connection before creating a new one
+    if (peerConnection) {
+        peerConnection.close();
+        peerConnection = null;
+    }
     peerConnection = new RTCPeerConnection(config);
     
     peerConnection.ontrack = event => {