Fix: Ensure MFC and Web remote desktop sessions are fully independent

macos/ScreenHandler.mm

@@ -156,7 +156,13 @@ bool ScreenHandler::init()
 
 void ScreenHandler::start(IOCPClient* client, uint64_t clientID)
 {
-    if (m_running) return;
+    // If already running, just send TOKEN_BITMAPINFO again
+    // This allows server to create additional dialogs (MFC can open while Web is active)
+    if (m_running) {
+        NSLog(@"ScreenHandler already running, sending TOKEN_BITMAPINFO for new dialog");
+        sendBitmapInfo();
+        return;
+    }
 
     m_client = client;
     m_clientID = clientID;