feat(03-07): create StorageView XAML, DI registration, and MainWindow wiring

- StorageView.xaml: DataGrid with IndentLevel-based name indentation
- StorageView.xaml.cs: code-behind wiring DataContext to StorageViewModel
- IndentConverter.cs: IndentConverter, BytesConverter, InverseBoolConverter
- App.xaml: register converters and RightAlignStyle as Application.Resources
- App.xaml.cs: register IStorageService, StorageCsvExportService, StorageHtmlExportService, StorageViewModel, StorageView
- MainWindow.xaml: add x:Name=StorageTabItem to Storage TabItem
- MainWindow.xaml.cs: wire StorageTabItem.Content from DI

SharepointToolbox/Views/Tabs/StorageView.xaml.cs

@@ -0,0 +1,12 @@
+using System.Windows.Controls;
+
+namespace SharepointToolbox.Views.Tabs;
+
+public partial class StorageView : UserControl
+{
+    public StorageView(ViewModels.Tabs.StorageViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+    }
+}