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/App.xaml

@@ -1,8 +1,15 @@
 <Application x:Class="SharepointToolbox.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:SharepointToolbox">
+             xmlns:local="clr-namespace:SharepointToolbox"
+             xmlns:conv="clr-namespace:SharepointToolbox.Views.Converters">
     <Application.Resources>
         <BooleanToVisibilityConverter x:Key="BoolToVisibilityConverter" />
+        <conv:IndentConverter      x:Key="IndentConverter" />
+        <conv:BytesConverter       x:Key="BytesConverter" />
+        <conv:InverseBoolConverter x:Key="InverseBoolConverter" />
+        <Style x:Key="RightAlignStyle" TargetType="TextBlock">
+            <Setter Property="HorizontalAlignment" Value="Right" />
+        </Style>
     </Application.Resources>
 </Application>