phase 2b: add AliasTreePlugin DockPanePlugin entry + wiring

- AliasTreePlugin.cs: DockPanePlugin with ElementHost wrapper
- XAML: wire Expanded/Selected event handlers via TreeViewItem
- Both projects compile, plugin deployed to Navisworks

TransportPlugin.csproj

@@ -148,6 +148,7 @@
     <Compile Include="src\Core\Database\BackupManager.cs" />
     <Compile Include="src\Core\AliasTree\AliasNodeIdentity.cs" />
     <Compile Include="src\Core\AliasTree\AliasDataStore.cs" />
+    <Compile Include="src\Core\AliasTree\AliasTreePlugin.cs" />
     <Compile Include="src\Core\Services\TimeTagCalculator.cs" />
     <Compile Include="src\Core\Services\TimeTagService.cs" />
     <Compile Include="src\Core\Services\TimeTagExporter.cs" />

src/Core/AliasTree/AliasTreePlugin.cs

@@ -0,0 +1,51 @@
+using Autodesk.Navisworks.Api.Plugins;
+using NavisworksTransport.UI.WPF.Views;
+using NavisworksTransport.Utils;
+using System.Windows.Forms.Integration;
+
+namespace NavisworksTransport.Core.AliasTree
+{
+    /// <summary>
+    /// 别名导航树 — DockPanePlugin 入口
+    /// 
+    /// 使用方式：
+    /// 1. 启动 Navisworks
+    /// 2. View → Docking Windows → 别名导航树
+    /// 3. 手动拖放到内置 Selection Tree 下方
+    /// </summary>
+    [Plugin("NavisworksTransport.AliasTree", "Tian",
+        DisplayName = "别名导航树",
+        ToolTip = "自定义节点别名管理面板 — 双击编辑、右键菜单、JSON 导入导出")]
+    [DockPanePlugin(300, 400, FixedSize = false, AutoScroll = true)]
+    public class AliasTreePlugin : DockPanePlugin
+    {
+        public override System.Windows.Forms.Control CreateControlPane()
+        {
+            LogManager.Info("[别名树] 创建 DockPane 面板");
+
+            var eh = new ElementHost
+            {
+                AutoSize = true
+            };
+
+            var control = new AliasTreeControl();
+            eh.Child = control;
+            eh.CreateControl();
+
+            return eh;
+        }
+
+        public override void DestroyControlPane(System.Windows.Forms.Control pane)
+        {
+            LogManager.Info("[别名树] 销毁 DockPane 面板");
+
+            if (pane is ElementHost eh && eh.Child is AliasTreeControl ctrl)
+            {
+                ctrl.Cleanup();
+                eh.Child = null;
+            }
+
+            pane?.Dispose();
+        }
+    }
+}

src/UI/WPF/Views/AliasTreeControl.xaml

@@ -166,7 +166,9 @@
                   VirtualizingPanel.VirtualizationMode="Recycling"
                   Background="White"
                   BorderThickness="0"
-                  ItemContainerStyle="{StaticResource AliasTreeViewItemStyle}">
+                  ItemContainerStyle="{StaticResource AliasTreeViewItemStyle}"
+                  TreeViewItem.Expanded="OnTreeViewItemExpanded"
+                  TreeViewItem.Selected="OnTreeViewItemSelected">
             <TreeView.ContextMenu>
                 <ContextMenu>
                     <MenuItem Header="编辑别名" Click="OnCtxEditClick">