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/MainWindow.xaml

@@ -44,8 +44,8 @@
       <TabItem x:Name="PermissionsTabItem"
                Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.permissions]}">
       </TabItem>
-      <TabItem Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.storage]}">
-        <controls:FeatureTabBase />
+      <TabItem x:Name="StorageTabItem"
+               Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.storage]}">
       </TabItem>
       <TabItem Header="{Binding Source={x:Static loc:TranslationSource.Instance}, Path=[tab.search]}">
         <controls:FeatureTabBase />