Update meeting summary agent UI

MeetingAssistant/Workflow/WorkflowRulesEditorChatPipeline.cs

@@ -59,11 +59,11 @@ public sealed class WorkflowRulesEditorChatPipeline : IWorkflowRulesEditorChatPi
         IReadOnlyList<WorkflowRulesEditorChatMessage> conversation,
         string userMessage,
         CancellationToken cancellationToken,
-        Action<string>? statusChanged = null)
+        Action<WorkflowRulesEditorActivityUpdate>? activityChanged = null)
     {
         if (string.IsNullOrWhiteSpace(userMessage))
         {
-            return new WorkflowRulesEditorChatResult("", conversation);
+            return new WorkflowRulesEditorChatResult("");
         }
 
         var agentOptions = options.WorkflowRulesEditor.ToEffectiveAgentOptions(options.Agent);
@@ -108,10 +108,18 @@ public sealed class WorkflowRulesEditorChatPipeline : IWorkflowRulesEditorChatPi
             compactionOptions,
             logger,
             firstRequestIsUser: true,
-            retrying: () => statusChanged?.Invoke("Reconnecting..."));
+            retrying: () => activityChanged?.Invoke(WorkflowRulesEditorActivityUpdate.Status("Reconnecting...")),
+            reasoningSummaryChanged: text => activityChanged?.Invoke(WorkflowRulesEditorActivityUpdate.Thinking(text)));
         var functionClient = chatClient
             .AsBuilder()
-            .UseFunctionInvocation(loggerFactory)
+            .UseFunctionInvocation(loggerFactory, client =>
+            {
+                client.FunctionInvoker = async (context, token) =>
+                {
+                    activityChanged?.Invoke(WorkflowRulesEditorActivityUpdate.ToolCall(context.Function.Name));
+                    return await context.Function.InvokeAsync(context.Arguments, token);
+                };
+            })
             .Build();
 
         var response = await functionClient.GetResponseAsync(
@@ -121,11 +129,7 @@ public sealed class WorkflowRulesEditorChatPipeline : IWorkflowRulesEditorChatPi
         var responseText = string.IsNullOrWhiteSpace(response.Text)
             ? "(No response text returned.)"
             : response.Text.Trim();
-        var nextConversation = conversation
-            .Append(new WorkflowRulesEditorChatMessage(WorkflowRulesEditorChatRole.User, userMessage.Trim()))
-            .Append(new WorkflowRulesEditorChatMessage(WorkflowRulesEditorChatRole.Agent, responseText))
-            .ToList();
-        return new WorkflowRulesEditorChatResult(responseText, nextConversation);
+        return new WorkflowRulesEditorChatResult(responseText);
     }
 
     private static ChatMessage ToChatMessage(WorkflowRulesEditorChatMessage message)