fix:设置窗口关闭导致的无法点击

Ink Canvas/MainWindow.xaml.cs

@@ -681,7 +681,9 @@ namespace Ink_Canvas {
         {
             // 显示设置面板
             BorderSettings.Visibility = Visibility.Visible;
+            // 设置蒙版为可点击，并添加半透明背景
             BorderSettingsMask.IsHitTestVisible = true;
+            BorderSettingsMask.Background = new SolidColorBrush(System.Windows.Media.Color.FromArgb(1, 0, 0, 0));
             
             // 获取SettingsPanelScrollViewer中的所有GroupBox
             var stackPanel = SettingsPanelScrollViewer.Content as StackPanel;