refactor(工具栏): 将BorderTools从Border改为Popup控件并优化显示逻辑

重构工具栏中的BorderTools控件，将其从Border改为Popup控件，并添加自定义位置回调
优化显示/隐藏逻辑，使用IsOpen属性替代Visibility控制
更新相关动画效果调用为对应的Popup版本
调整UI样式和布局，提升视觉一致性

Ink Canvas/MainWindow_cs/MW_Save&OpenStrokes.cs

@@ -98,7 +98,7 @@ namespace Ink_Canvas
         {
             if (lastBorderMouseDownObject != sender || inkCanvas.Visibility != Visibility.Visible) return;
 
-            AnimationsHelper.HideWithSlideAndFade(BorderTools);
+            AnimationsHelper.HidePopupWithSlideAndFade(BorderTools);
             AnimationsHelper.HidePopupWithSlideAndFade(BoardBorderToolsPopup);
 
             GridNotifications.Visibility = Visibility.Collapsed;
@@ -916,7 +916,7 @@ namespace Ink_Canvas
         private void SymbolIconOpenStrokes_MouseUp(object sender, MouseButtonEventArgs e)
         {
             if (lastBorderMouseDownObject != sender) return;
-            AnimationsHelper.HideWithSlideAndFade(BorderTools);
+            AnimationsHelper.HidePopupWithSlideAndFade(BorderTools);
             AnimationsHelper.HidePopupWithSlideAndFade(BoardBorderToolsPopup);
 
             var openFileDialog = new OpenFileDialog();