feat(01-01): create WPF solution with Generic Host entry point and NuGet packages

- SharepointToolbox.slnx solution with WPF project
- net10.0-windows target, PublishTrimmed=false, StartupObject set
- App.xaml StartupUri removed, App demoted from ApplicationDefinition to Page
- App.xaml.cs: [STAThread] Main with Host.CreateDefaultBuilder + Serilog rolling file
- All NuGet packages: CommunityToolkit.Mvvm 8.4.2, MSAL 4.83.3, PnP.Framework 1.18.0, Serilog 4.3.1
- Build: 0 errors, 0 warnings

SharepointToolbox/MainWindow.xaml.cs

@@ -0,0 +1,23 @@
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace SharepointToolbox;
+
+/// <summary>
+/// Interaction logic for MainWindow.xaml
+/// </summary>
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}