Update meeting summary agent UI

MeetingAssistant/Workflow/WpfWorkflowRulesEditorWindowService.Windows.cs

@@ -11,7 +11,7 @@ namespace MeetingAssistant.Workflow;
 
 internal sealed class WpfWorkflowRulesEditorWindowService : IWorkflowRulesEditorWindowService
 {
-    internal const string WindowTitle = "Settings and logs";
+    internal const string WindowTitle = "Meeting Summary Agent";
 
     private readonly IServiceProvider services;
     private readonly WorkflowRulesEditorMarkdownLinkResolver linkResolver;
@@ -288,19 +288,21 @@ internal sealed class WorkflowRulesEditorWpfWindow : Window
             conversationPanel.ActualHeight);
 
         conversationPanel.Children.Clear();
-        foreach (var message in viewModel.Messages)
+        foreach (var item in viewModel.Messages)
         {
-            conversationPanel.Children.Add(CreateMessageCard(message));
+            conversationPanel.Children.Add(item.Kind == WorkflowRulesEditorConversationItemKind.Activity
+                ? CreateActivityExpander(item)
+                : CreateMessageCard(item.Message!));
         }
 
         if (viewModel.IsThinking)
         {
-            conversationPanel.Children.Add(new TextBlock
+            foreach (var activity in viewModel.ActivityMessages)
             {
-                Text = viewModel.ActivityMessage,
-                Foreground = MutedText,
-                Margin = new Thickness(4, 2, 4, 2)
-            });
+                conversationPanel.Children.Add(CreateActivityLine(activity));
+            }
+
+            conversationPanel.Children.Add(CreateActivityLine(viewModel.ActivityMessage));
         }
 
         sendButton.IsEnabled = !viewModel.IsThinking;
@@ -338,6 +340,43 @@ internal sealed class WorkflowRulesEditorWpfWindow : Window
         return card;
     }
 
+    private static Expander CreateActivityExpander(WorkflowRulesEditorConversationItem item)
+    {
+        var details = new StackPanel
+        {
+            Orientation = Orientation.Vertical,
+            Margin = new Thickness(16, 2, 4, 6)
+        };
+
+        foreach (var line in item.ActivityLines ?? [])
+        {
+            details.Children.Add(CreateActivityLine(line));
+        }
+
+        var expander = new Expander
+        {
+            Header = item.Content,
+            Content = details,
+            IsExpanded = item.IsExpanded,
+            Foreground = MutedText,
+            Background = Brushes.Transparent,
+            Margin = new Thickness(4, 0, 4, 8)
+        };
+        expander.Expanded += (_, _) => item.IsExpanded = true;
+        expander.Collapsed += (_, _) => item.IsExpanded = false;
+        return expander;
+    }
+
+    private static TextBlock CreateActivityLine(string text)
+    {
+        return new TextBlock
+        {
+            Text = text,
+            Foreground = MutedText,
+            Margin = new Thickness(4, 2, 4, 2)
+        };
+    }
+
     private static Style CreateSendButtonStyle()
     {
         var style = new Style(typeof(Button));