优化更新代码，添加界面功能并整合

WPFluent/Controls/IconElement/IconSource.cs

@@ -0,0 +1,27 @@
+
+
+
+using System.Windows.Controls;
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Represents the base class for an icon source.
+/// </summary>
+public abstract class IconSource : DependencyObject
+{
+    /// <summary>
+    /// Identifies the <see cref="Foreground"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty ForegroundProperty = DependencyProperty.Register(
+        nameof(Foreground),
+        typeof(Brush),
+        typeof(IconSource),
+        new FrameworkPropertyMetadata(SystemColors.ControlTextBrush));
+
+    public abstract IconElement CreateIconElement();
+
+    /// <inheritdoc cref="Control.Foreground"/>
+    public Brush Foreground { get => (Brush)GetValue(ForegroundProperty); set => SetValue(ForegroundProperty, value); }
+}