优化更新代码，添加界面功能并整合

WPFluent/Converters/RightSplitThicknessConverter.cs

@@ -0,0 +1,22 @@
+
+
+
+using System.Windows.Data;
+
+namespace WPFluent.Converters;
+
+internal class RightSplitThicknessConverter : IValueConverter
+{
+    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if(value is not Thickness thickness)
+        {
+            return default(Thickness);
+        }
+
+        return new Thickness(thickness.Left, thickness.Top, thickness.Right, thickness.Bottom);
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    { throw new NotImplementedException(); }
+}