AX Agent 실행 이벤트 UI 갱신을 배치형으로 조정해 Cowork·Code 흔들림을 줄임

- ChatWindow에 agent UI event timer를 추가해 상태바, 진행률, 플랜 뷰어, 자동 프리뷰를 최근 이벤트 기준으로 묶어서 반영

- OnAgentEvent는 실행 상태를 먼저 conversation/app state에 반영하고 화면 갱신은 FlushPendingAgentUiEvent 경로로 분리

- README와 DEVELOPMENT 문서에 2026-04-05 13:29 (KST) 기준 이력과 검증 결과를 반영

- 검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\ (경고 0, 오류 0)

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -86,6 +86,7 @@ public partial class ChatWindow : Window
     private readonly DispatcherTimer _executionHistoryRenderTimer;
     private readonly DispatcherTimer _taskSummaryRefreshTimer;
     private readonly DispatcherTimer _conversationPersistTimer;
+    private readonly DispatcherTimer _agentUiEventTimer;
     private CancellationTokenSource? _gitStatusRefreshCts;
     private int _displayedLength; // 현재 화면에 표시된 글자 수
     private ResourceDictionary? _agentThemeDictionary;
@@ -122,6 +123,7 @@ public partial class ChatWindow : Window
     private bool _pendingExecutionHistoryAutoScroll;
     private readonly Dictionary<string, ChatConversation> _pendingConversationPersists = new(StringComparer.OrdinalIgnoreCase);
     private readonly HashSet<string> _expandedDraftQueueTabs = new(StringComparer.OrdinalIgnoreCase);
+    private AgentEvent? _pendingAgentUiEvent;
     private void ApplyQuickActionVisual(Button button, bool active, string activeBg, string activeFg)
     {
         if (button?.Content is not string text)
@@ -260,6 +262,12 @@ public partial class ChatWindow : Window
             _conversationPersistTimer.Stop();
             FlushPendingConversationPersists();
         };
+        _agentUiEventTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(90) };
+        _agentUiEventTimer.Tick += (_, _) =>
+        {
+            _agentUiEventTimer.Stop();
+            FlushPendingAgentUiEvent();
+        };
 
         KeyDown += ChatWindow_KeyDown;
         UpdateConversationFailureFilterUi();
@@ -8543,6 +8551,7 @@ public partial class ChatWindow : Window
     private void ResetStreamingUiState()
     {
         FlushPendingConversationPersists();
+        FlushPendingAgentUiEvent();
         _cursorTimer.Stop();
         _elapsedTimer.Stop();
         _typingTimer.Stop();
@@ -8550,6 +8559,7 @@ public partial class ChatWindow : Window
         _pendingExecutionHistoryAutoScroll = false;
         _taskSummaryRefreshTimer.Stop();
         _conversationPersistTimer.Stop();
+        _agentUiEventTimer.Stop();
         HideStickyProgress();
         StopRainbowGlow();
         _activeStreamText = null;
@@ -8628,6 +8638,51 @@ public partial class ChatWindow : Window
         _conversationPersistTimer.Start();
     }
 
+    private void ScheduleAgentUiEvent(AgentEvent evt)
+    {
+        _pendingAgentUiEvent = evt;
+        _agentUiEventTimer.Stop();
+        _agentUiEventTimer.Start();
+    }
+
+    private void FlushPendingAgentUiEvent()
+    {
+        var evt = _pendingAgentUiEvent;
+        _pendingAgentUiEvent = null;
+        if (evt == null)
+            return;
+
+        UpdateStatusBar(evt);
+        UpdateAgentProgressBar(evt);
+        if (evt.StepCurrent > 0 && evt.StepTotal > 0)
+            UpdatePlanViewerStep(evt);
+        if (evt.Type == AgentEventType.Complete)
+            CompletePlanViewer();
+
+        if (evt.Success && !string.IsNullOrEmpty(evt.FilePath))
+            RefreshFileTreeIfVisible();
+
+        if (evt.Type == AgentEventType.ToolResult && evt.ToolName == "suggest_actions" && evt.Success)
+            RenderSuggestActionChips(evt.Summary);
+
+        if (evt.Success && !string.IsNullOrEmpty(evt.FilePath) &&
+            (evt.Type == AgentEventType.ToolResult || evt.Type == AgentEventType.Complete) &&
+            WriteToolNames.Contains(evt.ToolName))
+        {
+            var autoPreview = _settings.Settings.Llm.AutoPreview;
+            if (autoPreview == "auto")
+            {
+                if (PreviewWindow.IsOpen)
+                    PreviewWindow.RefreshIfOpen(evt.FilePath);
+                else
+                    TryShowPreview(evt.FilePath);
+
+                if (!PreviewWindow.IsOpen)
+                    TryShowPreview(evt.FilePath);
+            }
+        }
+    }
+
     private void PersistConversationSnapshot(string rememberTab, ChatConversation conversation, string failureLabel)
     {
         if (conversation == null || string.IsNullOrWhiteSpace(conversation.Id))
@@ -9063,8 +9118,6 @@ public partial class ChatWindow : Window
             && string.Equals(eventTab, _activeTab, StringComparison.OrdinalIgnoreCase))
             ScheduleExecutionHistoryRender(autoScroll: true);
 
-        // 하단 상태바 업데이트
-        UpdateStatusBar(evt);
         _appState.ApplyAgentEvent(evt);
         if (evt.Type == AgentEventType.Complete)
             AppendConversationAgentRun(evt, "completed", string.IsNullOrWhiteSpace(evt.Summary) ? "작업 완료" : evt.Summary, eventTab);
@@ -9079,42 +9132,7 @@ public partial class ChatWindow : Window
             UpdateStatusTokens(_agentCumulativeInputTokens, _agentCumulativeOutputTokens);
         }
 
-        // 스티키 진행률 바 업데이트
-        UpdateAgentProgressBar(evt);
-
-        // 계획 뷰어 단계 갱신
-        if (evt.StepCurrent > 0 && evt.StepTotal > 0)
-            UpdatePlanViewerStep(evt);
-        if (evt.Type == AgentEventType.Complete)
-            CompletePlanViewer();
-
-        // 파일 탐색기 자동 새로고침
-        if (evt.Success && !string.IsNullOrEmpty(evt.FilePath))
-            RefreshFileTreeIfVisible();
-
-        // suggest_actions 도구 결과 → 후속 작업 칩 표시
-        if (evt.Type == AgentEventType.ToolResult && evt.ToolName == "suggest_actions" && evt.Success)
-            RenderSuggestActionChips(evt.Summary);
-
-        // 파일 생성/수정 결과가 있으면 미리보기 자동 표시 또는 갱신
-        if (evt.Success && !string.IsNullOrEmpty(evt.FilePath) &&
-            (evt.Type == AgentEventType.ToolResult || evt.Type == AgentEventType.Complete) &&
-            WriteToolNames.Contains(evt.ToolName))
-        {
-            var autoPreview = _settings.Settings.Llm.AutoPreview;
-            if (autoPreview == "auto")
-            {
-                // 별도 창 미리보기: 이미 열린 파일이면 새로고침, 아니면 새 탭 추가
-                if (PreviewWindow.IsOpen)
-                    PreviewWindow.RefreshIfOpen(evt.FilePath);
-                else
-                    TryShowPreview(evt.FilePath);
-
-                // 새 파일이면 항상 표시
-                if (!PreviewWindow.IsOpen)
-                    TryShowPreview(evt.FilePath);
-            }
-        }
+        ScheduleAgentUiEvent(evt);
 
         ScheduleTaskSummaryRefresh();
     }