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

server.js

@@ -24,9 +24,11 @@ io.on("connection", (socket) => {
     socket.broadcast.emit("broadcaster");
   });
 
-  // When a viewer joins
+  // When a viewer joins — notify ONLY the broadcaster, not all sockets
   socket.on("viewer", () => {
-    socket.broadcast.emit("viewer", socket.id);
+    if (broadcasterSocketId) {
+      socket.to(broadcasterSocketId).emit("viewer", socket.id);
+    }
   });
 
   // WebRTC Signaling