v1.2.0: 重构为插件+独立Manager架构，横版UI，精确保留文本框边距的文档转换

Better-EN5/UI/BoardMenuImportInk.cs

@@ -0,0 +1,30 @@
+using Microsoft.Win32;
+using Cvte.EasiNote;
+using Cvte.Windows.Input;
+using BetterEN5.Services;
+
+namespace BetterEN5.UI
+{
+    public class BoardMenuImportInk : BoardEditMenuItem
+    {
+        public BoardMenuImportInk()
+        {
+            SortHint = 997;
+            Command = new DelegateCommand(() =>
+            {
+                var dialog = new OpenFileDialog
+                {
+                    Title = "导入墨迹",
+                    Filter = "墨迹文件 (*.ink.json)|*.ink.json|JSON 文件 (*.json)|*.json",
+                    DefaultExt = ".ink.json"
+                };
+                if (dialog.ShowDialog() == true)
+                {
+                    var inkService = new InkService();
+                    _ = inkService.ImportInkAsync(dialog.FileName);
+                }
+            });
+            Predicate = _ => true;
+        }
+    }
+}