优化更新代码，添加界面功能并整合

WPFluent/Converters/DoubleToPercentageConverter.cs

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+using System;
+using System.Linq;
+using System.Windows.Data;
+
+namespace WPFluent.Converters;
+
+public class DoubleToPercentageConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        var d = (double)value;
+        return Math.Round(d * 100, MidpointRounding.AwayFromZero);
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        var str = value.ToString().TrimEnd('%');
+        if(double.TryParse(str, out var d))
+        {
+            return d / 100;
+        }
+        return Binding.DoNothing;
+    }
+}