feat(工具栏设置): 添加工具栏配置页面及功能实现

实现工具栏配置页面，允许用户调整工具栏按钮的顺序和可见性
包含主工具栏、画布控制和尾部按钮三个区域的配置
支持恢复默认布局功能

Ink Canvas/Controls/Toolbar/Items/EraserToolItem.cs

@@ -8,6 +8,7 @@ namespace Ink_Canvas.Controls.Toolbar.Items
         public override string LocalizationKey => "FloatingBar_AreaEraser";
         public override ToolbarSlot DefaultSlot => ToolbarSlot.FloatingBarCanvasControls;
         public override int DefaultOrder => 100;
+        public override string MenuPanelName => "EraserSizePanel";
 
         protected override void OnClick(IToolbarHost host, object sender, MouseButtonEventArgs e)
             => host.Window.EraserIcon_Click(sender, e);