优化更新代码，添加界面功能并整合

WPFluent/Controls/FontIcon/CustomFontSymbols.cs

@@ -0,0 +1,13 @@
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Violeta Fluent Icons
+/// https://github.com/emako/fluentui-violeta-icons
+/// </summary>
+public sealed class CustomFontSymbols
+{
+    public const string Edit = "\xe900";
+    public const string Empty = "\xe901";
+    public const string Extension = "\xe902";
+    public const string File = "\xe903";
+}