feat(01-07): add ProfileManagementDialog with DI factory wiring

- Create Views/Dialogs/ProfileManagementDialog.xaml (modal Window with Name/TenantUrl/ClientId fields and TranslationSource bindings)
- Create Views/Dialogs/ProfileManagementDialog.xaml.cs (DI constructor injection, LoadAsync on Loaded)
- Add OpenProfileManagementDialog factory delegate to MainWindowViewModel
- Wire ManageProfilesCommand to open dialog via factory, reload profiles after close
- Register ProfileManagementDialog as Transient in DI (App.xaml.cs)
- Inject IServiceProvider into MainWindow constructor for DI-resolved dialog factory

SharepointToolbox/Views/Dialogs/ProfileManagementDialog.xaml.cs

@@ -0,0 +1,19 @@
+using System.Windows;
+using SharepointToolbox.ViewModels;
+
+namespace SharepointToolbox.Views.Dialogs;
+
+public partial class ProfileManagementDialog : Window
+{
+    public ProfileManagementDialog(ProfileManagementViewModel viewModel)
+    {
+        InitializeComponent();
+        DataContext = viewModel;
+        Loaded += async (_, _) => await viewModel.LoadAsync();
+    }
+
+    private void CloseButton_Click(object sender, RoutedEventArgs e)
+    {
+        Close();
+    }
+}