Fix DataGrid MethodAccessException by adding Avalonia.Controls.DataGrid package

Co-authored-by: tautcony <8295052+tautcony@users.noreply.github.com>

Author: Copilot

ChapterTool.Avalonia/ChapterTool.Avalonia.csproj

@@ -18,6 +18,7 @@
 
   <ItemGroup>
     <PackageReference Include="Avalonia" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.3.6" />
     <PackageReference Include="Avalonia.Desktop" Version="11.3.6" />
     <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.6" />
     <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.6" />