Add selected item import export

MainWindow.xaml.cs

@@ -1260,6 +1260,114 @@ public partial class MainWindow : Window
         }
     }
 
+    private void ExportSelectedItem_Click(object sender, RoutedEventArgs e)
+    {
+        if (selectedItem is null)
+        {
+            MessageBox.Show("Select an item or menu to export first.", "Taskbar Launcher");
+            return;
+        }
+
+        ApplyCurrentItem();
+        string safeTitle = MakeSafeFileName(string.IsNullOrWhiteSpace(selectedItem.Title) ? "launcher-item" : selectedItem.Title);
+        using SaveFileDialog dialog = new()
+        {
+            Title = "Export selected launcher item",
+            Filter = "JSON item files|*.json|All files|*.*",
+            FileName = $"{safeTitle}-{DateTime.Now:yyyyMMdd-HHmmss}.json",
+            InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
+        };
+
+        if (dialog.ShowDialog() != System.Windows.Forms.DialogResult.OK)
+        {
+            return;
+        }
+
+        try
+        {
+            string exportPath = ConfigService.ExportItemTo(dialog.FileName, selectedItem);
+            StatusText.Text = $"Exported {selectedItem.Title} to {exportPath}";
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show($"Could not export selected item.\n\n{ex.Message}", "Taskbar Launcher");
+        }
+    }
+
+    private void ImportItem_Click(object sender, RoutedEventArgs e)
+    {
+        if (controller is null)
+        {
+            return;
+        }
+
+        using OpenFileDialog dialog = new()
+        {
+            Title = "Import launcher item",
+            Filter = "JSON item files|*.json|All files|*.*",
+            InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
+        };
+
+        if (dialog.ShowDialog() != System.Windows.Forms.DialogResult.OK)
+        {
+            return;
+        }
+
+        try
+        {
+            ApplyCurrentItem();
+            LauncherItem importedItem = ConfigService.ImportItemFrom(dialog.FileName);
+            AddImportedItem(importedItem);
+            selectedPath = FindItemPath(importedItem);
+            RefreshView(importedItem);
+            StatusText.Text = $"Imported {importedItem.Title}. Click Save to keep it.";
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show($"Could not import item.\n\n{ex.Message}", "Taskbar Launcher");
+        }
+    }
+
+    private void AddImportedItem(LauncherItem importedItem)
+    {
+        if (controller is null)
+        {
+            return;
+        }
+
+        if (selectedItem is null)
+        {
+            controller.Config.Items.Add(importedItem);
+            return;
+        }
+
+        if (selectedItem.Type == LauncherItemType.Menu)
+        {
+            selectedItem.Children.Add(importedItem);
+            return;
+        }
+
+        List<LauncherItem>? siblings = FindSiblings(controller.Config.Items, selectedItem);
+        if (siblings is null)
+        {
+            controller.Config.Items.Add(importedItem);
+            return;
+        }
+
+        int selectedIndex = siblings.IndexOf(selectedItem);
+        siblings.Insert(selectedIndex + 1, importedItem);
+    }
+
+    private static string MakeSafeFileName(string fileName)
+    {
+        foreach (char invalidChar in Path.GetInvalidFileNameChars())
+        {
+            fileName = fileName.Replace(invalidChar, '-');
+        }
+
+        return fileName.Trim();
+    }
+
     private void ResetConfig_Click(object sender, RoutedEventArgs e)
     {
         MessageBoxResult result = MessageBox.Show(