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/ViewModels/MainWindowViewModel.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using CommunityToolkit.Mvvm.Messaging;
@@ -15,6 +16,9 @@ public partial class MainWindowViewModel : ObservableRecipient
     private readonly SessionManager _sessionManager;
     private readonly ILogger<MainWindowViewModel> _logger;
 
+    // Set by the view layer (MainWindow.xaml.cs) to open the dialog using DI
+    public Func<Window>? OpenProfileManagementDialog { get; set; }
+
     [ObservableProperty]
     private TenantProfile? _selectedProfile;
 
@@ -122,6 +126,12 @@ public partial class MainWindowViewModel : ObservableRecipient
 
     private void OpenProfileManagement()
     {
-        // Profile management dialog opened by View layer (plan 01-07)
+        if (OpenProfileManagementDialog == null) return;
+        var dialog = OpenProfileManagementDialog();
+        dialog.Owner = Application.Current.MainWindow;
+        dialog.ShowDialog();
+
+        // Reload profiles after dialog closes (modal — ShowDialog blocks until closed)
+        _ = LoadProfilesAsync();
     }
 }