Add condition preview feature to enhance user experience

- Add txtConditionPreview textbox initialization in UserForm_Initialize
- Clear preview textbox when refreshing details panel
- Implement lstDetails_Change event handler for condition preview
- Display complete condition text when user clicks on list items
- Improve readability for long/complex condition expressions
- Add debug output for troubleshooting

This enhancement allows users to easily view the full condition text for each material entry in a dedicated preview textbox, addressing the issue of long conditions being difficult to read in the narrow list column.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

VBA/Forms/frmAddSpec.frm

@@ -40,6 +40,11 @@ Private Sub UserForm_Initialize()
         .ListStyle = fmListStyleOption
     End With
 
+    ' 初始化预览文本框
+    On Error Resume Next
+    Me.txtConditionPreview.Text = ""
+    On Error GoTo 0
+
     ' 清理提示信息
     Me.lblLog.Caption = ""
 
@@ -144,6 +149,11 @@ Public Sub RefreshDetailsPanel()
     Me.lstDetails.Clear
     Me.chkSelectAllDetails.value = False
 
+    ' 刷新列表时顺便清空预览框
+    On Error Resume Next
+    Me.txtConditionPreview.Text = ""
+    On Error GoTo 0
+
     If Not Me.chkShowDetails.value Then Exit Sub ' 未开启显示明细则跳过
 
     ' 收集目前被勾选的宏观名称
@@ -171,6 +181,30 @@ Public Sub RefreshDetailsPanel()
     Next rowObj
 End Sub
 
+' ==============================================================================
+' 新增：处理列表框点击事件，将超长的选择条件发送到预览框自动换行显示
+' ==============================================================================
+Private Sub lstDetails_Change()
+    ' ListIndex 在多选模式下代表当前具有虚线焦点框的行
+    If Me.lstDetails.ListIndex >= 0 Then
+        On Error Resume Next
+        ' 获取隐藏列中的物理行号
+        Dim targetId As Long
+        targetId = CLng(Me.lstDetails.List(Me.lstDetails.ListIndex, 0))
+
+        ' 去内存库里抓取完整的 Condition，赋值给预览框
+        Dim rowObj As cBOMRow
+        For Each rowObj In mGlobalBOMs
+            If rowObj.ExcelRowIndex = targetId Then
+                Me.txtConditionPreview.Text = rowObj.Condition
+                Debug.Print rowObj.Condition
+                Exit For
+            End If
+        Next rowObj
+        On Error GoTo 0
+    End If
+End Sub
+
 ' ==============================================================================
 ' 4. 执行核心流水线
 ' ==============================================================================