feat(configmanager): add TreeNodeViewModel

NEW/src/Utils/JdeScoping.ConfigManager/ViewModels/TreeNodeViewModel.cs

@@ -2,17 +2,35 @@ using System.Collections.ObjectModel;
 
 namespace JdeScoping.ConfigManager.ViewModels;
 
+public enum TreeNodeType
+{
+    Folder,
+    SettingsSection,
+    Pipeline
+}
+
+public enum ValidationState
+{
+    Valid,
+    Warning,
+    Error,
+    Unknown
+}
+
 /// <summary>
 /// ViewModel for a tree node in the configuration tree.
-/// This is a stub implementation for Task 11 - full implementation in Task 12.
 /// </summary>
 public class TreeNodeViewModel : ViewModelBase
 {
     private bool _isModified;
+    private bool _isExpanded;
+    private bool _isSelected;
+    private ValidationState _validationState = ValidationState.Unknown;
 
-    public string Name { get; set; } = string.Empty;
-    public string Icon { get; set; } = string.Empty;
-    public string StatusIcon { get; set; } = string.Empty;
+    public string Name { get; }
+    public string Icon { get; }
+    public TreeNodeType NodeType { get; }
+    public string? SectionKey { get; init; }
     public ObservableCollection<TreeNodeViewModel> Children { get; } = [];
 
     public bool IsModified
@@ -20,4 +38,41 @@ public class TreeNodeViewModel : ViewModelBase
         get => _isModified;
         set => SetProperty(ref _isModified, value);
     }
+
+    public bool IsExpanded
+    {
+        get => _isExpanded;
+        set => SetProperty(ref _isExpanded, value);
+    }
+
+    public bool IsSelected
+    {
+        get => _isSelected;
+        set => SetProperty(ref _isSelected, value);
+    }
+
+    public ValidationState ValidationState
+    {
+        get => _validationState;
+        set
+        {
+            if (SetProperty(ref _validationState, value))
+                OnPropertyChanged(nameof(StatusIcon));
+        }
+    }
+
+    public string StatusIcon => ValidationState switch
+    {
+        ValidationState.Valid => "✓",
+        ValidationState.Warning => "⚠",
+        ValidationState.Error => "✗",
+        _ => ""
+    };
+
+    public TreeNodeViewModel(string name, string icon, TreeNodeType nodeType)
+    {
+        Name = name;
+        Icon = icon;
+        NodeType = nodeType;
+    }
 }