chore: release v2.4

- Add theme system (Dark/Light palettes, ModernTheme, ThemeManager)
- Add InputDialog, Spinner common view
- Add DuplicatesCsvExportService
- Refresh views, dialogs, and view models across tabs
- Update localization strings (en/fr)
- Tweak services (transfer, permissions, search, user access, ownership elevation, bulk operations)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SharepointToolbox/ViewModels/Tabs/DuplicatesViewModel.cs

@@ -6,6 +6,7 @@ using CommunityToolkit.Mvvm.Input;
 using Microsoft.Extensions.Logging;
 using Microsoft.Win32;
 using SharepointToolbox.Core.Models;
+using SharepointToolbox.Localization;
 using SharepointToolbox.Services;
 using SharepointToolbox.Services.Export;
 
@@ -31,6 +32,7 @@ public partial class DuplicatesViewModel : FeatureViewModelBase
     private readonly IDuplicatesService _duplicatesService;
     private readonly ISessionManager _sessionManager;
     private readonly DuplicatesHtmlExportService _htmlExportService;
+    private readonly DuplicatesCsvExportService _csvExportService;
     private readonly IBrandingService _brandingService;
     private readonly ILogger<FeatureViewModelBase> _logger;
     private TenantProfile? _currentProfile;
@@ -46,6 +48,14 @@ public partial class DuplicatesViewModel : FeatureViewModelBase
     [ObservableProperty] private bool _includeSubsites;
     [ObservableProperty] private string _library = string.Empty;
 
+    /// <summary>0 = Single file, 1 = Split by site.</summary>
+    [ObservableProperty] private int _splitModeIndex;
+    /// <summary>0 = Separate HTML files, 1 = Single tabbed HTML.</summary>
+    [ObservableProperty] private int _htmlLayoutIndex;
+
+    private ReportSplitMode CurrentSplit => SplitModeIndex == 1 ? ReportSplitMode.BySite : ReportSplitMode.Single;
+    private HtmlSplitLayout CurrentLayout => HtmlLayoutIndex == 1 ? HtmlSplitLayout.SingleTabbed : HtmlSplitLayout.SeparateFiles;
+
     private ObservableCollection<DuplicateRow> _results = new();
     public ObservableCollection<DuplicateRow> Results
     {
@@ -55,16 +65,19 @@ public partial class DuplicatesViewModel : FeatureViewModelBase
             _results = value;
             OnPropertyChanged();
             ExportHtmlCommand.NotifyCanExecuteChanged();
+            ExportCsvCommand.NotifyCanExecuteChanged();
         }
     }
 
     public IAsyncRelayCommand ExportHtmlCommand { get; }
+    public IAsyncRelayCommand ExportCsvCommand { get; }
     public TenantProfile? CurrentProfile => _currentProfile;
 
     public DuplicatesViewModel(
         IDuplicatesService duplicatesService,
         ISessionManager sessionManager,
         DuplicatesHtmlExportService htmlExportService,
+        DuplicatesCsvExportService csvExportService,
         IBrandingService brandingService,
         ILogger<FeatureViewModelBase> logger)
         : base(logger)
@@ -72,24 +85,26 @@ public partial class DuplicatesViewModel : FeatureViewModelBase
         _duplicatesService = duplicatesService;
         _sessionManager    = sessionManager;
         _htmlExportService = htmlExportService;
+        _csvExportService  = csvExportService;
         _brandingService   = brandingService;
         _logger            = logger;
 
         ExportHtmlCommand = new AsyncRelayCommand(ExportHtmlAsync, CanExport);
+        ExportCsvCommand  = new AsyncRelayCommand(ExportCsvAsync,  CanExport);
     }
 
     protected override async Task RunOperationAsync(CancellationToken ct, IProgress<OperationProgress> progress)
     {
         if (_currentProfile == null)
         {
-            StatusMessage = "No tenant selected. Please connect to a tenant first.";
+            StatusMessage = TranslationSource.Instance["err.no_tenant_connected"];
             return;
         }
 
         var urls = GlobalSites.Select(s => s.Url).Where(u => !string.IsNullOrWhiteSpace(u)).ToList();
         if (urls.Count == 0)
         {
-            StatusMessage = "Select at least one site from the toolbar.";
+            StatusMessage = TranslationSource.Instance["err.no_sites_selected"];
             return;
         }
 
@@ -152,6 +167,7 @@ public partial class DuplicatesViewModel : FeatureViewModelBase
         _lastGroups = Array.Empty<DuplicateGroup>();
         OnPropertyChanged(nameof(CurrentProfile));
         ExportHtmlCommand.NotifyCanExecuteChanged();
+        ExportCsvCommand.NotifyCanExecuteChanged();
     }
 
     internal void SetCurrentProfile(TenantProfile profile) => _currentProfile = profile;
@@ -179,9 +195,28 @@ public partial class DuplicatesViewModel : FeatureViewModelBase
                 branding = new ReportBranding(mspLogo, clientLogo);
             }
 
-            await _htmlExportService.WriteAsync(_lastGroups, dialog.FileName, CancellationToken.None, branding);
+            await _htmlExportService.WriteAsync(_lastGroups, dialog.FileName, CurrentSplit, CurrentLayout, CancellationToken.None, branding);
             Process.Start(new ProcessStartInfo(dialog.FileName) { UseShellExecute = true });
         }
         catch (Exception ex) { StatusMessage = $"Export failed: {ex.Message}"; _logger.LogError(ex, "HTML export failed."); }
     }
+
+    private async Task ExportCsvAsync()
+    {
+        if (_lastGroups.Count == 0) return;
+        var dialog = new SaveFileDialog
+        {
+            Title = "Export duplicates report to CSV",
+            Filter = "CSV files (*.csv)|*.csv|All files (*.*)|*.*",
+            DefaultExt = "csv",
+            FileName = "duplicates_report"
+        };
+        if (dialog.ShowDialog() != true) return;
+        try
+        {
+            await _csvExportService.WriteAsync(_lastGroups, dialog.FileName, CurrentSplit, CancellationToken.None);
+            Process.Start(new ProcessStartInfo(dialog.FileName) { UseShellExecute = true });
+        }
+        catch (Exception ex) { StatusMessage = $"Export failed: {ex.Message}"; _logger.LogError(ex, "CSV export failed."); }
+    }
 }