feat(02-07): create PermissionsView XAML + code-behind and register DI

- Created PermissionsView.xaml with left scan-config panel and right results DataGrid
- Created PermissionsView.xaml.cs wiring ViewModel via IServiceProvider, factory for SitePickerDialog
- Updated App.xaml.cs: registered IPermissionsService, ISiteListService, CsvExportService,
  HtmlExportService, PermissionsViewModel, PermissionsView, SitePickerDialog, and
  Func<TenantProfile, SitePickerDialog> factory; also registered ISessionManager -> SessionManager
- Updated MainWindow.xaml: replaced FeatureTabBase stub with named PermissionsTabItem
- Updated MainWindow.xaml.cs: wires PermissionsTabItem.Content from DI-resolved PermissionsView
- Added CurrentProfile public accessor, SitesSelectedLabel computed property, and
  IsMaxDepth toggle property to PermissionsViewModel
- Build: 0 errors, 0 warnings. Tests: 60 passed, 3 skipped (live/interactive)

SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs

@@ -44,9 +44,27 @@ public partial class PermissionsViewModel : FeatureViewModelBase
     [ObservableProperty]
     private int _folderDepth = 1;
 
+    /// <summary>
+    /// When true, sets FolderDepth to 999 (scan all levels).
+    /// </summary>
+    public bool IsMaxDepth
+    {
+        get => FolderDepth >= 999;
+        set
+        {
+            if (value)
+                FolderDepth = 999;
+            else if (FolderDepth >= 999)
+                FolderDepth = 1;
+            OnPropertyChanged();
+        }
+    }
+
     [ObservableProperty]
     private ObservableCollection<PermissionEntry> _results = new();
 
+    partial void OnFolderDepthChanged(int value) => OnPropertyChanged(nameof(IsMaxDepth));
+
     // ── Commands ────────────────────────────────────────────────────────────
 
     public IAsyncRelayCommand ExportCsvCommand { get; }
@@ -69,6 +87,19 @@ public partial class PermissionsViewModel : FeatureViewModelBase
 
     internal TenantProfile? _currentProfile;
 
+    /// <summary>
+    /// Public accessor for the current tenant profile — used by View layer dialog factory.
+    /// </summary>
+    public TenantProfile? CurrentProfile => _currentProfile;
+
+    /// <summary>
+    /// Label shown in the UI: "3 site(s) selected" or empty when none are selected.
+    /// </summary>
+    public string SitesSelectedLabel =>
+        SelectedSites.Count > 0
+            ? string.Format(Localization.TranslationSource.Instance["perm.sites.selected"], SelectedSites.Count)
+            : string.Empty;
+
     // ── Constructors ────────────────────────────────────────────────────────
 
     /// <summary>
@@ -93,6 +124,7 @@ public partial class PermissionsViewModel : FeatureViewModelBase
         ExportCsvCommand = new AsyncRelayCommand(ExportCsvAsync, CanExport);
         ExportHtmlCommand = new AsyncRelayCommand(ExportHtmlAsync, CanExport);
         OpenSitePickerCommand = new RelayCommand(ExecuteOpenSitePicker);
+        SelectedSites.CollectionChanged += (_, _) => OnPropertyChanged(nameof(SitesSelectedLabel));
     }
 
     /// <summary>
@@ -115,6 +147,7 @@ public partial class PermissionsViewModel : FeatureViewModelBase
         ExportCsvCommand = new AsyncRelayCommand(ExportCsvAsync, CanExport);
         ExportHtmlCommand = new AsyncRelayCommand(ExportHtmlAsync, CanExport);
         OpenSitePickerCommand = new RelayCommand(ExecuteOpenSitePicker);
+        SelectedSites.CollectionChanged += (_, _) => OnPropertyChanged(nameof(SitesSelectedLabel));
     }
 
     // ── FeatureViewModelBase implementation ─────────────────────────────────
@@ -184,6 +217,8 @@ public partial class PermissionsViewModel : FeatureViewModelBase
         Results = new ObservableCollection<PermissionEntry>();
         SiteUrl = string.Empty;
         SelectedSites.Clear();
+        OnPropertyChanged(nameof(SitesSelectedLabel));
+        OnPropertyChanged(nameof(CurrentProfile));
         ExportCsvCommand.NotifyCanExecuteChanged();
         ExportHtmlCommand.NotifyCanExecuteChanged();
     }