chore: archive v1.1 Enhanced Reports milestone

v1.1 shipped with 4 phases (25 plans), 10/10 requirements complete:
- Global site selection (toolbar picker, all tabs consume)
- User access audit (Graph people-picker, direct/group/inherited)
- Simplified permissions (plain-language labels, risk levels, detail toggle)
- Storage visualization (LiveCharts2 pie/donut + bar charts)

Post-phase polish: centralized site selection (removed per-tab pickers),
claims prefix stripping, StorageMetrics backfill, chart tooltip fix,
summary stats in app + HTML exports.

205 tests passing, 10,484 LOC.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

SharepointToolbox/ViewModels/Tabs/FolderStructureViewModel.cs

@@ -22,11 +22,9 @@ public partial class FolderStructureViewModel : FeatureViewModelBase
     private readonly BulkResultCsvExportService _exportService;
     private readonly ILogger<FeatureViewModelBase> _logger;
     private TenantProfile? _currentProfile;
-    private bool _hasLocalSiteOverride;
     private List<FolderStructureRow>? _validRows;
     private BulkOperationSummary<string>? _lastResult;
 
-    [ObservableProperty] private string _siteUrl = string.Empty;
     [ObservableProperty] private string _libraryTitle = string.Empty;
     [ObservableProperty] private string _previewSummary = string.Empty;
     [ObservableProperty] private string _resultSummary = string.Empty;
@@ -66,26 +64,6 @@ public partial class FolderStructureViewModel : FeatureViewModelBase
         ExportFailedCommand = new AsyncRelayCommand(ExportFailedAsync, () => HasFailures);
     }
 
-    protected override void OnGlobalSitesChanged(IReadOnlyList<SiteInfo> sites)
-    {
-        if (_hasLocalSiteOverride) return;
-        SiteUrl = sites.Count > 0 ? sites[0].Url : string.Empty;
-    }
-
-    partial void OnSiteUrlChanged(string value)
-    {
-        if (string.IsNullOrWhiteSpace(value))
-        {
-            _hasLocalSiteOverride = false;
-            if (GlobalSites.Count > 0)
-                SiteUrl = GlobalSites[0].Url;
-        }
-        else if (GlobalSites.Count == 0 || value != GlobalSites[0].Url)
-        {
-            _hasLocalSiteOverride = true;
-        }
-    }
-
     private void ImportCsv()
     {
         var dlg = new OpenFileDialog
@@ -128,26 +106,36 @@ public partial class FolderStructureViewModel : FeatureViewModelBase
         if (_currentProfile == null) throw new InvalidOperationException("No tenant connected.");
         if (_validRows == null || _validRows.Count == 0)
             throw new InvalidOperationException("No valid rows. Import a CSV first.");
-        if (string.IsNullOrWhiteSpace(SiteUrl))
-            throw new InvalidOperationException("Site URL is required.");
         if (string.IsNullOrWhiteSpace(LibraryTitle))
             throw new InvalidOperationException("Library title is required.");
 
+        var urls = GlobalSites.Select(s => s.Url).Where(u => !string.IsNullOrWhiteSpace(u)).ToList();
+        if (urls.Count == 0)
+            throw new InvalidOperationException("Select at least one site from the toolbar.");
+
         var uniquePaths = FolderStructureService.BuildUniquePaths(_validRows);
         var message = string.Format(TranslationSource.Instance["bulk.confirm.message"],
-            $"{uniquePaths.Count} folders will be created in {LibraryTitle}");
+            $"{uniquePaths.Count} folders will be created in {LibraryTitle} on {urls.Count} site(s)");
         if (ShowConfirmDialog != null && !ShowConfirmDialog(message))
             return;
 
-        var profile = new TenantProfile
-        {
-            Name = _currentProfile.Name,
-            TenantUrl = SiteUrl,
-            ClientId = _currentProfile.ClientId,
-        };
-        var ctx = await _sessionManager.GetOrCreateContextAsync(profile, ct);
+        var allResults = new List<BulkItemResult<string>>();
 
-        _lastResult = await _folderService.CreateFoldersAsync(ctx, LibraryTitle, _validRows, progress, ct);
+        foreach (var url in urls)
+        {
+            var profile = new TenantProfile
+            {
+                Name = _currentProfile.Name,
+                TenantUrl = url,
+                ClientId = _currentProfile.ClientId,
+            };
+            var ctx = await _sessionManager.GetOrCreateContextAsync(profile, ct);
+
+            var result = await _folderService.CreateFoldersAsync(ctx, LibraryTitle, _validRows, progress, ct);
+            allResults.AddRange(result.Results);
+        }
+
+        _lastResult = new BulkOperationSummary<string>(allResults);
 
         await Application.Current.Dispatcher.InvokeAsync(() =>
         {
@@ -175,8 +163,6 @@ public partial class FolderStructureViewModel : FeatureViewModelBase
     protected override void OnTenantSwitched(TenantProfile profile)
     {
         _currentProfile = profile;
-        _hasLocalSiteOverride = false;
-        SiteUrl = string.Empty;
         LibraryTitle = string.Empty;
         PreviewRows = new();
         _validRows = null;