improve:展台

Ink Canvas/MainWindow.xaml

@@ -10688,9 +10688,9 @@
                                 <Border x:Name="BoothResolutionTabIndicator" 
                                         Background="#66CCFF" 
                                         CornerRadius="6" 
-                                        Width="68" Height="38" 
+                                        Width="70" Height="38" 
                                         HorizontalAlignment="Left" VerticalAlignment="Center" 
-                                        Margin="1,0,0,0"/>
+                                        Margin="0,0,0,0"/>
                                 <Grid>
                                     <Button x:Name="BtnBoothResolution720" Width="70" Height="40" Background="Transparent" BorderThickness="0" 
                                             Click="BoothResolutionTab_Click" Tag="1280,720" Cursor="Hand" HorizontalAlignment="Left">

Ink Canvas/MainWindow.xaml.cs

@@ -3414,7 +3414,7 @@ namespace Ink_Canvas
 
             if (BoothResolutionTabIndicator != null)
             {
-                BoothResolutionTabIndicator.Margin = new Thickness(1 + index * 70, 0, 0, 0);
+                BoothResolutionTabIndicator.Margin = new Thickness(index * 70, 0, 0, 0);
             }
 
             var texts = new[] { BtnBoothResolution720?.Content as TextBlock, BtnBoothResolution1080?.Content as TextBlock, BtnBoothResolution2K?.Content as TextBlock, BtnBoothResolution4K?.Content as TextBlock };

Ink Canvas/MainWindow_cs/MW_VideoPresenter.cs

@@ -20,7 +20,7 @@ namespace Ink_Canvas
 {
     public partial class MainWindow : Window
     {
-        private static readonly SolidColorBrush BoothButtonHighlightBrush = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#66CCFF"));
+        private static readonly SolidColorBrush BoothButtonHighlightBrush = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#66CCFF"));
         private bool _boothButtonPressHandlersAttached;
 
         // 标记：用于在保存/恢复白板内容时排除“展台实时上屏”画面