fix(save-attachments): marshal folder-tree mutations to the Dispatcher

v1.2.15's tree picker built the whole tree inside an async method and
mutated the TreeView-bound ObservableCollections after an await. In this
VSTO host the WPF SynchronizationContext is not installed, so
ConfigureAwait(true) resumed on a thread-pool thread and FolderTree.Add
threw "changes to its SourceCollection from a thread different from the
Dispatcher thread" — the exception was swallowed and the tree showed
empty (no folders selectable at all).

Capture the UI Dispatcher in the view-model and marshal every bound
collection mutation (FolderTree + each node's Children) through it, so
the tree populates regardless of which thread the network await resumes
on.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/OutlookAddin.UI/Dialogs/SaveAttachmentsDialog.xaml

@@ -3,8 +3,8 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:conv="clr-namespace:MarcusLaw.OutlookAddin.UI.Converters"
         Title="שמור קבצים מצורפים ל-Klear"
-        Height="560" Width="620"
+        Height="640" Width="620"
-        MinHeight="420" MinWidth="500"
+        MinHeight="480" MinWidth="500"
         FlowDirection="RightToLeft"
         WindowStartupLocation="CenterOwner"
         ShowInTaskbar="False"
@@ -144,24 +144,38 @@
 
         <!-- Folder -->
         <DockPanel Grid.Row="2" Margin="0,10,0,0" LastChildFill="True">
-            <TextBlock DockPanel.Dock="Left" Text="תיקייה:" VerticalAlignment="Center"
+            <DockPanel DockPanel.Dock="Top" LastChildFill="True" Margin="0,0,0,4">
-                       Margin="0,0,8,0" Foreground="{StaticResource Muted}" FontSize="12" />
+                <TextBlock DockPanel.Dock="Left" Text="תיקיית יעד:" VerticalAlignment="Center"
-            <TextBlock DockPanel.Dock="Right" Text="טוען…" VerticalAlignment="Center"
+                           Margin="0,0,8,0" Foreground="{StaticResource Muted}" FontSize="12" />
-                       Margin="8,0,0,0" Foreground="{StaticResource Muted}" FontSize="12"
+                <TextBlock DockPanel.Dock="Right" Text="טוען…" VerticalAlignment="Center"
-                       Visibility="{Binding IsLoadingSubfolders, Converter={StaticResource BoolToVis}}" />
+                           Margin="8,0,0,0" Foreground="{StaticResource Muted}" FontSize="12"
-            <ComboBox ItemsSource="{Binding Subfolders}"
+                           Visibility="{Binding IsLoadingSubfolders, Converter={StaticResource BoolToVis}}" />
-                      SelectedItem="{Binding SelectedSubfolder}"
+                <TextBlock Text="בחר/י תיקייה או תת-תיקייה לשמירה (ניתן להרחיב רמות)"
-                      Padding="6,4">
+                           VerticalAlignment="Center" Foreground="{StaticResource Muted}" FontSize="11"
-                <ComboBox.Style>
+                           TextTrimming="CharacterEllipsis" />
-                    <Style TargetType="ComboBox">
+            </DockPanel>
-                        <Style.Triggers>
+            <Border Style="{StaticResource Card}" MaxHeight="150">
-                            <DataTrigger Binding="{Binding IsLoadingSubfolders}" Value="True">
+                <TreeView x:Name="FolderTreeView"
-                                <Setter Property="IsEnabled" Value="False" />
+                          ItemsSource="{Binding FolderTree}"
-                            </DataTrigger>
+                          BorderThickness="0"
-                        </Style.Triggers>
+                          Background="Transparent"
-                    </Style>
+                          SelectedItemChanged="FolderTreeView_SelectedItemChanged">
-                </ComboBox.Style>
+                    <TreeView.ItemContainerStyle>
-            </ComboBox>
+                        <Style TargetType="TreeViewItem">
+                            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
+                            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
+                        </Style>
+                    </TreeView.ItemContainerStyle>
+                    <TreeView.ItemTemplate>
+                        <HierarchicalDataTemplate ItemsSource="{Binding Children}">
+                            <StackPanel Orientation="Horizontal" Margin="0,1">
+                                <TextBlock Text="📁" Margin="0,0,4,0" FontSize="13" VerticalAlignment="Center" />
+                                <TextBlock Text="{Binding Name}" VerticalAlignment="Center" FontSize="13" />
+                            </StackPanel>
+                        </HierarchicalDataTemplate>
+                    </TreeView.ItemTemplate>
+                </TreeView>
+            </Border>
         </DockPanel>
 
         <!-- Attachments header -->

src/OutlookAddin.UI/Dialogs/SaveAttachmentsDialog.xaml.cs

@@ -32,5 +32,15 @@ namespace MarcusLaw.OutlookAddin.UI.Dialogs
             DialogResult = _viewModel?.DialogResult;
             Close();
         }
+
+        // WPF's TreeView.SelectedItem is read-only, so we mirror the selection
+        // into the view-model here (the chosen node drives the save target).
+        private void FolderTreeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
+        {
+            if (_viewModel != null)
+            {
+                _viewModel.SelectedFolder = e.NewValue as FolderNodeViewModel;
+            }
+        }
     }
 }

src/OutlookAddin.UI/ViewModels/FolderNodeViewModel.cs

@@ -0,0 +1,168 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Threading.Tasks;
+using System.Windows.Threading;
+using CommunityToolkit.Mvvm.ComponentModel;
+using MarcusLaw.OutlookAddin.Core.Services;
+using Serilog;
+
+namespace MarcusLaw.OutlookAddin.UI.ViewModels
+{
+    /// <summary>
+    /// One node in the network-storage folder tree shown by the
+    /// save-attachments dialog. Children are listed lazily the first time the
+    /// node is expanded, so the user can drill into nested subfolders to any
+    /// depth without us listing the whole tree up front.
+    /// </summary>
+    public sealed partial class FolderNodeViewModel : ObservableObject
+    {
+        private readonly IEspoCrmClient? _client;
+        private readonly ILogger? _logger;
+        private readonly Dispatcher? _dispatcher;
+        private bool _childrenLoaded;
+        private bool _loadingStarted;
+
+        /// <summary>Label shown in the tree.</summary>
+        public string Name { get; }
+
+        /// <summary>
+        /// Path relative to the share root (e.g. "56-ליאור זייני/מסמכים").
+        /// Used to list this folder's children. Empty for placeholders.
+        /// </summary>
+        public string FullPath { get; }
+
+        /// <summary>
+        /// Path relative to the case-root folder (e.g. "מסמכים/רפואי"), or
+        /// null for the case-root node itself. This is what the save target
+        /// appends to the resolved case folder.
+        /// </summary>
+        public string? RelativePath { get; }
+
+        /// <summary>True for the transient "loading…" child placeholder.</summary>
+        public bool IsPlaceholder { get; }
+
+        public bool IsRoot => !IsPlaceholder && RelativePath == null;
+
+        public ObservableCollection<FolderNodeViewModel> Children { get; } =
+            new ObservableCollection<FolderNodeViewModel>();
+
+        [ObservableProperty]
+        private bool isExpanded;
+
+        [ObservableProperty]
+        private bool isSelected;
+
+        [ObservableProperty]
+        private bool isLoading;
+
+        /// <summary>Real folder node.</summary>
+        public FolderNodeViewModel(
+            IEspoCrmClient client,
+            ILogger logger,
+            Dispatcher dispatcher,
+            string name,
+            string fullPath,
+            string? relativePath)
+        {
+            _client = client ?? throw new ArgumentNullException(nameof(client));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+            _dispatcher = dispatcher ?? throw new ArgumentNullException(nameof(dispatcher));
+            Name = name;
+            FullPath = fullPath;
+            RelativePath = relativePath;
+            // A placeholder child makes the expand chevron appear before we've
+            // listed; expanding swaps it for the real children (or, if there
+            // are none, the node becomes a leaf).
+            Children.Add(new FolderNodeViewModel());
+        }
+
+        /// <summary>Placeholder ("loading…") node constructor.</summary>
+        private FolderNodeViewModel()
+        {
+            Name = "טוען…";
+            FullPath = string.Empty;
+            RelativePath = string.Empty;
+            IsPlaceholder = true;
+            _childrenLoaded = true;
+        }
+
+        partial void OnIsExpandedChanged(bool value)
+        {
+            if (value && !_childrenLoaded && !_loadingStarted)
+            {
+                _loadingStarted = true;
+                _ = LoadChildrenAsync();
+            }
+        }
+
+        /// <summary>
+        /// Lists this folder's subfolders and replaces the placeholder with
+        /// real child nodes. <paramref name="seedNames"/> (used for the root)
+        /// guarantees the default case subfolders show even if the share
+        /// listing lags or omits a not-yet-created folder.
+        /// </summary>
+        public async Task LoadChildrenAsync(IEnumerable<string>? seedNames = null)
+        {
+            if (_client == null) return;
+            IsLoading = true;
+
+            // Build into a local list and swap once at the end. The seeds are
+            // added first so that even if the share listing fails the default
+            // subfolders still show; on failure for a non-seeded node the list
+            // is empty and the node reads as a leaf rather than "loading…".
+            var seen = new HashSet<string>(StringComparer.Ordinal);
+            var loaded = new List<FolderNodeViewModel>();
+            if (seedNames != null)
+            {
+                foreach (var n in seedNames)
+                {
+                    if (seen.Add(n)) loaded.Add(MakeChild(n));
+                }
+            }
+
+            try
+            {
+                var items = await _client.ListNetworkStorageFolderAsync(FullPath).ConfigureAwait(true);
+                foreach (var item in items)
+                {
+                    if (!item.IsFolder) continue;
+                    if (!seen.Add(item.Name)) continue;
+                    loaded.Add(MakeChild(item.Name));
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger?.Warning(ex, "Listing subfolders under '{Path}' failed", FullPath);
+            }
+            finally
+            {
+                // Marshal onto the Dispatcher: once this node's TreeViewItem
+                // exists, Children is bound and must only be mutated on the UI
+                // thread (the network await above can resume on a thread-pool
+                // thread in this VSTO host).
+                OnUi(() =>
+                {
+                    Children.Clear();
+                    foreach (var child in loaded) Children.Add(child);
+                });
+                _childrenLoaded = true;
+                IsLoading = false;
+            }
+        }
+
+        private FolderNodeViewModel MakeChild(string name)
+        {
+            var fullPath = string.IsNullOrEmpty(FullPath) ? name : FullPath + "/" + name;
+            var relativePath = IsRoot ? name : RelativePath + "/" + name;
+            return new FolderNodeViewModel(_client!, _logger!, _dispatcher!, name, fullPath, relativePath);
+        }
+
+        private void OnUi(Action action)
+        {
+            var d = _dispatcher;
+            if (d == null || d.CheckAccess()) action();
+            else d.Invoke(action);
+        }
+    }
+}

src/OutlookAddin.UI/ViewModels/SaveAttachmentsViewModel.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Windows.Threading;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using MarcusLaw.OutlookAddin.Core.Models;
@@ -31,6 +32,7 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
 
         private readonly IEspoCrmClient _client;
         private readonly ILogger _logger;
+        private readonly Dispatcher _dispatcher;
         private CancellationTokenSource? _searchCts;
 
         [ObservableProperty]
@@ -40,7 +42,7 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
         private CaseEntity? selectedCase;
 
         [ObservableProperty]
-        private string? selectedSubfolder;
+        private FolderNodeViewModel? selectedFolder;
 
         [ObservableProperty]
         private string? statusMessage;
@@ -58,7 +60,12 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
 
         public ObservableCollection<CaseEntity> Cases { get; } = new ObservableCollection<CaseEntity>();
 
-        public ObservableCollection<string> Subfolders { get; } = new ObservableCollection<string>();
+        /// <summary>
+        /// Folder tree for the selected case. Holds a single root node (the
+        /// case folder); its children are the subfolders, loaded lazily so the
+        /// user can drill into any nesting depth.
+        /// </summary>
+        public ObservableCollection<FolderNodeViewModel> FolderTree { get; } = new ObservableCollection<FolderNodeViewModel>();
 
         public ObservableCollection<AttachmentRowViewModel> Attachments { get; } = new ObservableCollection<AttachmentRowViewModel>();
 
@@ -78,14 +85,20 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
         }
 
         /// <summary>
-        /// Subfolder string the user picked, or null to save to the case
+        /// Folder the user picked, as a path relative to the case folder
-        /// folder root.
+        /// (e.g. "מסמכים/רפואי"), or null to save to the case folder root.
+        /// Multi-segment paths are honoured by the save target, which appends
+        /// this to <see cref="ResolvedCaseFolderPath"/>.
         /// </summary>
-        public string? ChosenSubfolderName =>
+        public string? ChosenSubfolderName
-            string.IsNullOrEmpty(SelectedSubfolder) ||
+        {
-            string.Equals(SelectedSubfolder, RootSentinel, StringComparison.Ordinal)
+            get
-                ? null
+            {
-                : SelectedSubfolder;
+                var f = SelectedFolder;
+                if (f == null || f.IsPlaceholder || f.IsRoot) return null;
+                return string.IsNullOrEmpty(f.RelativePath) ? null : f.RelativePath;
+            }
+        }
 
         public CaseEntity? PickedCase => SelectedCase;
 
@@ -98,8 +111,15 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
         {
             _client = client ?? throw new ArgumentNullException(nameof(client));
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+            // Captured on the UI thread (the VM is constructed on the thread
+            // that shows the dialog). Used to marshal ObservableCollection
+            // mutations back onto the Dispatcher — in this VSTO host the WPF
+            // SynchronizationContext is not installed, so ConfigureAwait(true)
+            // resumes on a thread-pool thread and a bound-collection Add throws
+            // "changes ... from a thread different from the Dispatcher thread".
+            _dispatcher = Dispatcher.CurrentDispatcher;
 
-            ResetSubfolders();
+            ResetFolderTree();
 
             foreach (var att in attachments)
             {
@@ -139,12 +159,20 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
             }
         }
 
-        private void ResetSubfolders()
+        /// <summary>Runs <paramref name="action"/> on the UI/Dispatcher thread.</summary>
+        private void OnUi(Action action)
         {
-            Subfolders.Clear();
+            if (_dispatcher.CheckAccess()) action();
-            Subfolders.Add(RootSentinel);
+            else _dispatcher.Invoke(action);
-            foreach (var f in DefaultCaseSubfolders) Subfolders.Add(f);
+        }
-            SelectedSubfolder = Subfolders[0];
+
+        private void ResetFolderTree()
+        {
+            OnUi(() =>
+            {
+                FolderTree.Clear();
+                SelectedFolder = null;
+            });
         }
 
         partial void OnSearchTextChanged(string value)
@@ -169,7 +197,7 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
         /// </summary>
         public async Task RefreshSubfoldersForSelectedCaseAsync()
         {
-            ResetSubfolders();
+            ResetFolderTree();
             ResolvedCaseFolderPath = null;
 
             var c = SelectedCase;
@@ -220,21 +248,28 @@ namespace MarcusLaw.OutlookAddin.UI.ViewModels
                 c.Id, c.Number ?? "(none)", primaryContactName ?? "(none)", c.NetworkStorageFolderPath ?? "(none)", folderPath);
             if (string.IsNullOrEmpty(folderPath)) return;
 
+            // Build the tree rooted at the case folder. The root node is
+            // selected by default (→ save to case root, matching the previous
+            // default), expanded, and seeded with the default subfolders so
+            // they appear even before the share listing returns. Deeper levels
+            // load lazily as the user expands them.
+            var root = new FolderNodeViewModel(_client, _logger, _dispatcher, RootSentinel, folderPath, relativePath: null);
+            OnUi(() =>
+            {
+                FolderTree.Add(root);
+                SelectedFolder = root;
+                root.IsSelected = true;
+            });
+
             try
             {
-                var items = await _client.ListNetworkStorageFolderAsync(folderPath).ConfigureAwait(true);
+                await root.LoadChildrenAsync(DefaultCaseSubfolders).ConfigureAwait(true);
-                foreach (var item in items)
-                {
-                    if (!item.IsFolder) continue;
-                    if (Subfolders.Contains(item.Name)) continue;
-                    if (string.Equals(item.Name, RootSentinel, StringComparison.Ordinal)) continue;
-                    Subfolders.Add(item.Name);
-                }
             }
             catch (Exception ex)
             {
                 _logger.Warning(ex, "Listing subfolders for case {CaseId} failed", c.Id);
             }
+            OnUi(() => root.IsExpanded = true);
         }
 
         /// <summary>

src/OutlookAddin/Properties/AssemblyInfo.cs

@@ -33,6 +33,6 @@ using System.Security;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.2.14.0")]
+[assembly: AssemblyVersion("1.2.16.0")]
-[assembly: AssemblyFileVersion("1.2.14.0")]
+[assembly: AssemblyFileVersion("1.2.16.0")]
 

src/OutlookAddin/Services/AddInHost.cs

@@ -127,6 +127,62 @@ namespace OutlookAddin.Services
             }
         }
 
+        /// <summary>
+        /// Shows a message box that is guaranteed to render above Outlook and
+        /// any other window. A bare <see cref="MessageBox.Show(string)"/> has
+        /// no owner — once our WPF dialog closes there is no active window on
+        /// the add-in thread, so the box sinks behind Outlook and the user
+        /// never sees the success/error result. We anchor it to a transient,
+        /// invisible top-most owner window parented to the foreground Outlook
+        /// window so it always surfaces on top. Caption is always "Klear".
+        /// </summary>
+        private MessageBoxResult ShowMessage(
+            string text,
+            MessageBoxButton button = MessageBoxButton.OK,
+            MessageBoxImage icon = MessageBoxImage.None)
+        {
+            Window? owner = null;
+            try
+            {
+                // A 1×1 borderless window at screen centre: imperceptible, but
+                // gives the MessageBox a top-most owner to z-order above. The
+                // box centres on this point → effectively centred on screen.
+                owner = new Window
+                {
+                    Width = 1,
+                    Height = 1,
+                    WindowStyle = WindowStyle.None,
+                    ResizeMode = ResizeMode.NoResize,
+                    ShowInTaskbar = false,
+                    Topmost = true,
+                    WindowStartupLocation = WindowStartupLocation.CenterScreen,
+                };
+
+                var hwnd = GetForegroundWindow();
+                if (hwnd == IntPtr.Zero)
+                {
+                    hwnd = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle;
+                }
+                if (hwnd != IntPtr.Zero)
+                {
+                    new WindowInteropHelper(owner).Owner = hwnd;
+                }
+
+                owner.Show();
+                owner.Activate();
+                return MessageBox.Show(owner, text, "Klear", button, icon);
+            }
+            catch (Exception ex)
+            {
+                Logger.Warning(ex, "ShowMessage top-most owner failed; falling back to ownerless box");
+                return MessageBox.Show(text, "Klear", button, icon);
+            }
+            finally
+            {
+                try { owner?.Close(); } catch { /* ignore */ }
+            }
+        }
+
         private static void EnableModernTls()
         {
             try
@@ -402,9 +458,8 @@ namespace OutlookAddin.Services
             if (mail == null) return;
             if (!IsConfigured)
             {
-                MessageBox.Show(
+                ShowMessage(
                     "התוסף עדיין לא מוגדר. פתח את ההגדרות תחילה.",
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Information);
                 return;
@@ -423,9 +478,8 @@ namespace OutlookAddin.Services
             catch (Exception ex)
             {
                 Logger.Error(ex, "LaunchComposeFromCaseAsync failed");
-                MessageBox.Show(
+                ShowMessage(
                     "טעינת התיק נכשלה: " + ex.Message,
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Error);
             }
@@ -444,9 +498,8 @@ namespace OutlookAddin.Services
             if (mail == null) return;
             if (!IsConfigured)
             {
-                var result = MessageBox.Show(
+                var result = ShowMessage(
                     "התוסף עדיין לא מוגדר. לפתוח את חלון ההגדרות עכשיו?",
-                    "Klear",
                     MessageBoxButton.YesNo,
                     MessageBoxImage.Information);
                 if (result == MessageBoxResult.Yes) LaunchSettings();
@@ -463,9 +516,8 @@ namespace OutlookAddin.Services
             catch (Exception ex)
             {
                 Logger.Error(ex, "LaunchSaveAttachmentsAsync: extract failed");
-                MessageBox.Show(
+                ShowMessage(
                     "קריאת הקבצים המצורפים נכשלה: " + ex.Message,
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Error);
                 return;
@@ -473,9 +525,8 @@ namespace OutlookAddin.Services
 
             if (envelope.Attachments.Count == 0)
             {
-                MessageBox.Show(
+                ShowMessage(
                     "אין במייל הזה קבצים מצורפים לשמירה.",
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Information);
                 return;
@@ -510,9 +561,8 @@ namespace OutlookAddin.Services
                 : SaveAttachmentsViewModel.ResolveCaseFolderPath(picked);
             if (string.IsNullOrEmpty(caseFolder))
             {
-                MessageBox.Show(
+                ShowMessage(
                     "לא ניתן לחשב את נתיב התיקייה של התיק. ייתכן שהתיק עוד לא הוגדר ב-Klear.",
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Warning);
                 return;
@@ -540,9 +590,8 @@ namespace OutlookAddin.Services
             catch (Exception ex)
             {
                 Logger.Error(ex, "LaunchSaveAttachmentsAsync failed");
-                MessageBox.Show(
+                ShowMessage(
                     "שמירת הקבצים נכשלה: " + ex.Message,
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Error);
             }
@@ -572,7 +621,7 @@ namespace OutlookAddin.Services
             }
         }
 
-        private static void ShowAttachmentSummary(AttachmentSaveSummary summary, string caseLabel, string targetPath)
+        private void ShowAttachmentSummary(AttachmentSaveSummary summary, string caseLabel, string targetPath)
         {
             string message;
             MessageBoxImage icon;
@@ -589,7 +638,7 @@ namespace OutlookAddin.Services
                 message = parts.Count == 0 ? "לא נשמרו פריטים." : string.Join(" · ", parts);
                 icon = summary.FailedCount > 0 ? MessageBoxImage.Warning : MessageBoxImage.Information;
             }
-            MessageBox.Show(message, "Klear", MessageBoxButton.OK, icon);
+            ShowMessage(message, MessageBoxButton.OK, icon);
         }
 
         /// <summary>
@@ -601,9 +650,8 @@ namespace OutlookAddin.Services
         {
             if (!IsConfigured)
             {
-                MessageBox.Show(
+                ShowMessage(
                     "התוסף עדיין לא מוגדר. פתח את ההגדרות תחילה.",
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Information);
                 return;
@@ -620,9 +668,8 @@ namespace OutlookAddin.Services
             {
                 Logger.Error(ex, "LaunchComposeFromCaseByIdAsync failed for caseId={CaseId}", caseId);
                 if (mail != null) try { Marshal.ReleaseComObject(mail); } catch { }
-                MessageBox.Show(
+                ShowMessage(
                     "פתיחת המייל מתיק נכשלה: " + ex.Message,
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Error);
             }
@@ -685,9 +732,8 @@ namespace OutlookAddin.Services
         {
             if (!IsConfigured)
             {
-                var result = MessageBox.Show(
+                var result = ShowMessage(
                     "התוסף עדיין לא מוגדר. לפתוח את חלון ההגדרות עכשיו?",
-                    "Klear",
                     MessageBoxButton.YesNo,
                     MessageBoxImage.Information);
                 if (result == MessageBoxResult.Yes)
@@ -700,9 +746,8 @@ namespace OutlookAddin.Services
             var mailItems = ReadCurrentSelection();
             if (mailItems.Count == 0)
             {
-                MessageBox.Show(
+                ShowMessage(
                     "לא נבחר מייל לתיוק. סמן מייל אחד או יותר ונסה שוב.",
-                    "Klear",
                     MessageBoxButton.OK,
                     MessageBoxImage.Information);
                 return;
@@ -743,9 +788,8 @@ namespace OutlookAddin.Services
                         Logger.Warning(
                             "Filing skipped — selected EspoEntityRef has no usable Id/EntityType (id={Id}, name={Name}, type={Type})",
                             vm.SelectedTarget?.Id, vm.SelectedTarget?.Name, vm.SelectedTarget?.EntityType);
-                        MessageBox.Show(
+                        ShowMessage(
                             "התיק שנבחר לא הוחזר עם סוג ישות (entityType) תקין. ייתכן ש-Klear שלך מחזיר שדה אחר; הלוג מכיל את הפרטים. שלח לאדמין.",
-                            "Klear",
                             MessageBoxButton.OK,
                             MessageBoxImage.Warning);
                         return;
@@ -917,7 +961,7 @@ namespace OutlookAddin.Services
             }
         }
 
-        private static void ShowSummary(FilingBatchSummary summary, FilingTarget target)
+        private void ShowSummary(FilingBatchSummary summary, FilingTarget target)
         {
             string message;
             MessageBoxImage icon;
@@ -938,7 +982,7 @@ namespace OutlookAddin.Services
                 icon = summary.FailedCount > 0 ? MessageBoxImage.Warning : MessageBoxImage.Information;
             }
 
-            MessageBox.Show(message, "Klear", MessageBoxButton.OK, icon);
+            ShowMessage(message, MessageBoxButton.OK, icon);
         }
 
         private static string? TryGetSenderName(Outlook.MailItem item)