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/MainWindow.xaml.cs

@@ -1,6 +1,9 @@
 using System.Windows;
 using System.Windows.Controls;
+using Microsoft.Extensions.DependencyInjection;
 using SharepointToolbox.ViewModels;
+using SharepointToolbox.Views.Dialogs;
+using SharepointToolbox.Views.Tabs;
 
 namespace SharepointToolbox;
 
@@ -8,11 +11,18 @@ public partial class MainWindow : Window
 {
     private readonly MainWindowViewModel _viewModel;
 
-    public MainWindow(MainWindowViewModel viewModel)
+    public MainWindow(MainWindowViewModel viewModel, IServiceProvider serviceProvider)
     {
         InitializeComponent();
         _viewModel = viewModel;
         DataContext = viewModel;
+
+        // Wire profile management dialog factory
+        viewModel.OpenProfileManagementDialog = () => serviceProvider.GetRequiredService<ProfileManagementDialog>();
+
+        // Replace Settings tab placeholder with the DI-resolved SettingsView
+        SettingsTabItem.Content = serviceProvider.GetRequiredService<SettingsView>();
+
         Loaded += OnLoaded;
     }