[feat:] implemented a basic editor for the wiki

MainWindow.axaml.cs

@@ -19,6 +19,7 @@ public partial class MainWindow : Window
 
     private WikiService _wikiService;
     public Uri filePath;
+    private string _selectedWikiFilePath;
 
     public MainWindow()
     {
@@ -230,6 +231,7 @@ public partial class MainWindow : Window
     {
         if (NavTree.SelectedItem is TreeViewItem t && t.Tag is WikiItem item && !item.IsFolder)
         {
+            _selectedWikiFilePath = item.Path;
             var text = await _wikiService.LoadFileContentAsync(item.Path);
             try
             {
@@ -246,9 +248,14 @@ public partial class MainWindow : Window
 
             EditButton.IsEnabled = true;
         }
+        else
+        {
+            _selectedWikiFilePath = null;
+            EditButton.IsEnabled = false;
+        }
     }
 
-    private void PopulateNavTree()
+    public void PopulateNavTree()
     {
         var roots = _wikiService.GetRootItems();
         var nodes = new List<TreeViewItem>();
@@ -446,7 +453,16 @@ public partial class MainWindow : Window
 
     private async void EditButton_Click(object? sender, RoutedEventArgs e)
     {
-        await MessageBox.Show(this, "Edit feature is currently disabled.", "Edit Disabled");
+        if (string.IsNullOrWhiteSpace(_selectedWikiFilePath))
+        {
+            await MessageBox.Show(this, "Bitte wählen Sie zunächst eine Wiki-Datei aus.", "Keine Datei ausgewählt");
+            return;
+        }
+
+        EditorWindow ew = new(_selectedWikiFilePath);
+        ew.Show();
+
+        //await MessageBox.Show(this, "Edit feature is currently disabled.", "Edit Disabled");
     }
 
     public void RefreshCustomerItems(int index = 0)