Bug Fix: Fix incorrect image download error log formatting

Tools.DownloadImageAsync used an interpolated format string with LogErrorFormat, causing misleading logs like Image [0]: 1. Updated the log call to use a proper format string so failed image downloads now show the real URL and UnityWebRequest error.

Assets/Scripts/MDPro3/Game/Tools.cs

@@ -224,7 +224,7 @@ namespace MDPro3
             }
             else
             {
-                UnityEngine.Debug.LogErrorFormat($"Image [{0}]: {1}", url, request.error);
+                UnityEngine.Debug.LogErrorFormat("Image [{0}]: {1}", url, request.error);
                 return null;
             }
         }