Add menu sort action

MainWindow.xaml.cs

@@ -107,6 +107,12 @@ public partial class MainWindow : Window
         var duplicateMenuItem = new System.Windows.Controls.MenuItem { Header = "Duplicate Item" };
         duplicateMenuItem.Click += DuplicateItem_Click;
 
+        var sortMenuItem = new System.Windows.Controls.MenuItem
+        {
+            Header = item.Type == LauncherItemType.Menu ? "Sort This Menu" : "Sort This Level"
+        };
+        sortMenuItem.Click += SortSelected_Click;
+
         var treeItem = new TreeViewItem
         {
             Header = $"{GetTreeStatusPrefix(item)}{item.Title} ({item.Type})",
@@ -117,6 +123,7 @@ public partial class MainWindow : Window
         treeItem.ContextMenu.Items.Add(disableMenuItem);
         treeItem.ContextMenu.Items.Add(openContainingFolderMenuItem);
         treeItem.ContextMenu.Items.Add(duplicateMenuItem);
+        treeItem.ContextMenu.Items.Add(sortMenuItem);
         treeItem.PreviewMouseRightButtonDown += (_, e) =>
         {
             treeItem.IsSelected = true;
@@ -1046,6 +1053,46 @@ public partial class MainWindow : Window
         RefreshView(selectedItem);
     }
 
+    private void SortSelected_Click(object sender, RoutedEventArgs e)
+    {
+        if (controller is null || selectedItem is null)
+        {
+            return;
+        }
+
+        ApplyCurrentItem();
+        LauncherItem itemToSelect = selectedItem;
+        if (selectedItem.Type == LauncherItemType.Menu)
+        {
+            SortItems(selectedItem.Children);
+            RefreshView(itemToSelect);
+            StatusText.Text = $"Sorted {itemToSelect.Title}. Click Save to keep it.";
+            return;
+        }
+
+        List<LauncherItem>? siblings = FindSiblings(controller.Config.Items, selectedItem);
+        if (siblings is null)
+        {
+            return;
+        }
+
+        SortItems(siblings);
+        RefreshView(itemToSelect);
+        StatusText.Text = $"Sorted this level. Click Save to keep it.";
+    }
+
+    private static void SortItems(List<LauncherItem> items)
+    {
+        List<LauncherItem> sortedItems = items
+            .OrderByDescending(item => item.IsFavorite)
+            .ThenBy(item => item.Title, StringComparer.CurrentCultureIgnoreCase)
+            .ThenBy(item => item.Type)
+            .ToList();
+
+        items.Clear();
+        items.AddRange(sortedItems);
+    }
+
     private static bool RemoveItem(List<LauncherItem> items, LauncherItem item)
     {
         if (items.Remove(item))