fix(UI): 优化弹出菜单位置和层级管理

修复弹出菜单在移动时位置不更新的问题，添加节流机制避免频繁刷新
使用Win32 API强制刷新弹出菜单位置并提升到最顶层
调整浮动工具栏和弹出菜单的样式和位置
移除未使用的字体样式定义

Ink Canvas/Helpers/AnimationsHelper.cs

@@ -1,6 +1,8 @@
 using System;
+using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Controls.Primitives;
+using System.Windows.Interop;
 using System.Windows.Media;
 using System.Windows.Media.Animation;
 
@@ -8,6 +10,133 @@ namespace Ink_Canvas.Helpers
 {
     internal class AnimationsHelper
     {
+        #region Win32 API - 用于提升 Popup 层级和刷新位置
+
+        [DllImport("user32.dll")]
+        private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);
+
+        [DllImport("user32.dll")]
+        private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
+
+        [DllImport("user32.dll")]
+        private static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
+
+        [StructLayout(LayoutKind.Sequential)]
+        private struct RECT
+        {
+            public int Left;
+            public int Top;
+            public int Right;
+            public int Bottom;
+        }
+
+        private const uint GW_HWNDPREV = 3;
+        private static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
+        private static readonly IntPtr HWND_TOP = new IntPtr(0);
+        private const uint SWP_NOMOVE = 0x0002;
+        private const uint SWP_NOSIZE = 0x0001;
+        private const uint SWP_NOACTIVATE = 0x0010;
+        private const uint SWP_SHOWWINDOW = 0x0040;
+
+        /// <summary>
+        /// 强制刷新 Popup 的实际窗口位置（终极方案）
+        /// 通过 Win32 API 直接操作窗口句柄
+        /// </summary>
+        public static void ForceRefreshPopupPosition(Popup popup)
+        {
+            if (popup?.Child == null || !popup.IsOpen) return;
+
+            try
+            {
+                Application.Current.Dispatcher.BeginInvoke(new Action(() =>
+                {
+                    try
+                    {
+                        var source = PresentationSource.FromVisual(popup.Child) as HwndSource;
+                        if (source?.Handle == null) return;
+
+                        var hwnd = source.Handle;
+
+                        // 获取当前窗口位置
+                        if (GetWindowRect(hwnd, out RECT rect))
+                        {
+                            // 使用相同的参数调用 SetWindowPos，但加上 SWP_SHOWWINDOW
+                            // 这会强制窗口管理器重新评估并更新窗口位置
+                            SetWindowPos(
+                                hwnd,
+                                HWND_TOP,
+                                rect.Left, rect.Top,
+                                rect.Right - rect.Left,
+                                rect.Bottom - rect.Top,
+                                SWP_NOACTIVATE | SWP_SHOWWINDOW);
+
+                            System.Diagnostics.Debug.WriteLine($"[PopupZOrder] Force refreshed position: ({rect.Left}, {rect.Top})");
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        System.Diagnostics.Debug.WriteLine($"[PopupZOrder] ForceRefreshPopupPosition failed: {ex.Message}");
+                    }
+                }), System.Windows.Threading.DispatcherPriority.Render);
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"[PopupZOrder] ForceRefreshPopupPosition error: {ex.Message}");
+            }
+        }
+
+        /// <summary>
+        /// 将 Popup 窗口提升到最顶层，确保不被其他控件遮挡
+        /// 采用多重策略确保置顶生效
+        /// </summary>
+        private static void BringPopupToFront(Popup popup)
+        {
+            try
+            {
+                if (popup?.Child == null) return;
+
+                Action bringToTopAction = () =>
+                {
+                    try
+                    {
+                        var source = PresentationSource.FromVisual(popup.Child) as HwndSource;
+                        if (source?.Handle == null) return;
+
+                        var hwnd = source.Handle;
+
+                        // 策略1：直接设置为 TOPMOST（最高优先级）
+                        SetWindowPos(hwnd, HWND_TOPMOST,
+                            0, 0, 0, 0,
+                            SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE | SWP_SHOWWINDOW);
+
+                        System.Diagnostics.Debug.WriteLine($"[PopupZOrder] Set TOPMOST for popup");
+                    }
+                    catch (Exception ex)
+                    {
+                        System.Diagnostics.Debug.WriteLine($"[PopupZOrder] BringPopupToFront failed: {ex.Message}");
+                    }
+                };
+
+                // 立即执行第一次
+                Application.Current.Dispatcher.BeginInvoke(bringToTopAction,
+                    System.Windows.Threading.DispatcherPriority.Render);
+
+                // 延迟 50ms 后再次执行（确保在其他窗口操作之后）
+                Application.Current.Dispatcher.BeginInvoke(bringToTopAction,
+                    System.Windows.Threading.DispatcherPriority.Normal);
+
+                // 延迟 100ms 后第三次执行（最终确认）
+                Application.Current.Dispatcher.BeginInvoke(bringToTopAction,
+                    System.Windows.Threading.DispatcherPriority.Background);
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"[PopupZOrder] BringPopupToFront error: {ex.Message}");
+            }
+        }
+
+        #endregion
+
         private static UIElement ResolveAnimationTarget(UIElement element)
         {
             return element;
@@ -296,6 +425,7 @@ namespace Ink_Canvas.Helpers
                 if (child == null)
                 {
                     popup.IsOpen = true;
+                    BringPopupToFront(popup);
                     return;
                 }
 
@@ -304,6 +434,9 @@ namespace Ink_Canvas.Helpers
 
                 popup.IsOpen = true;
 
+                // 提升 Popup 到最顶层
+                BringPopupToFront(popup);
+
                 var sb = new Storyboard();
 
                 var fadeInAnimation = new DoubleAnimation