코워크 탭 전환 시 처리 상태 오염과 자동 취소 수정\n\n- 탭 전환과 대화 재개 시 실행 중 작업을 즉시 취소하던 흐름 제거\n- 실행 소유 탭에서만 정지/일시정지 버튼과 라이브 진행 힌트가 보이도록 정리\n- README와 DEVELOPMENT 문서에 2026-04-07 03:13 (KST) 기준 변경 이력 반영\n- dotnet build 검증 완료 (경고 0, 오류 0)

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -1202,12 +1202,14 @@ public partial class ChatWindow : Window
         _cursorTimer.Stop();
         _elapsedTimer.Stop();
         _typingTimer.Stop();
+        StopLiveAgentProgressHints();
         StopRainbowGlow();
         HideStickyProgress();
         _activeStreamText = null;
         _elapsedLabel = null;
         _cachedStreamContent = "";
         _isStreaming = false;
+        _streamRunTab = null;
         BtnSend.IsEnabled = true;
         BtnStop.Visibility = Visibility.Collapsed;
         BtnPause.Visibility = Visibility.Collapsed;
@@ -1218,10 +1220,32 @@ public partial class ChatWindow : Window
         SetStatusIdle();
     }
 
+    private void RefreshStreamingControlsForActiveTab()
+    {
+        if (!_isStreaming)
+        {
+            BtnSend.IsEnabled = true;
+            BtnSend.Visibility = Visibility.Visible;
+            BtnStop.Visibility = Visibility.Collapsed;
+            BtnPause.Visibility = Visibility.Collapsed;
+            PauseIcon.Text = "\uE769";
+            return;
+        }
+
+        var runTab = string.IsNullOrWhiteSpace(_streamRunTab) ? _activeTab : _streamRunTab!;
+        var isOwningTab = string.Equals(runTab, _activeTab, StringComparison.OrdinalIgnoreCase);
+
+        BtnSend.IsEnabled = !isOwningTab;
+        BtnSend.Visibility = isOwningTab ? Visibility.Collapsed : Visibility.Visible;
+        BtnStop.Visibility = isOwningTab ? Visibility.Visible : Visibility.Collapsed;
+        BtnPause.Visibility = isOwningTab && (runTab == "Cowork" || runTab == "Code")
+            ? Visibility.Visible
+            : Visibility.Collapsed;
+    }
+
     private void TabChat_Checked(object sender, RoutedEventArgs e)
     {
         if (_activeTab == "Chat") return;
-        StopStreamingIfActive();
         SaveCurrentTabConversationId();
         PersistPerTabUiState();
         _activeTab = "Chat";
@@ -1232,7 +1256,6 @@ public partial class ChatWindow : Window
     private void TabCowork_Checked(object sender, RoutedEventArgs e)
     {
         if (_activeTab == "Cowork") return;
-        StopStreamingIfActive();
         SaveCurrentTabConversationId();
         PersistPerTabUiState();
         _activeTab = "Cowork";
@@ -1243,7 +1266,6 @@ public partial class ChatWindow : Window
     private void TabCode_Checked(object sender, RoutedEventArgs e)
     {
         if (_activeTab == "Code") return;
-        StopStreamingIfActive();
         SaveCurrentTabConversationId();
         PersistPerTabUiState();
         _activeTab = "Code";
@@ -1282,6 +1304,7 @@ public partial class ChatWindow : Window
         ApplyAgentThemeResources();
         ApplyExpressionLevelUi();
         ApplySidebarStateForActiveTab(animated: false);
+        RefreshStreamingControlsForActiveTab();
         if (CurrentTabTitle != null)
         {
             CurrentTabTitle.Text = _activeTab switch
@@ -6458,7 +6481,8 @@ public partial class ChatWindow : Window
                 OutputTokens = outputTokens,
             };
 
-        if (MessagePanel != null)
+        var runTab = string.IsNullOrWhiteSpace(_streamRunTab) ? _activeTab : _streamRunTab!;
+        if (MessagePanel != null && string.Equals(runTab, _activeTab, StringComparison.OrdinalIgnoreCase))
             RenderMessages(preserveViewport: true);
     }
 
@@ -6467,6 +6491,10 @@ public partial class ChatWindow : Window
         if (_liveAgentProgressHint == null)
             return null;
 
+        var runTab = string.IsNullOrWhiteSpace(_streamRunTab) ? _activeTab : _streamRunTab!;
+        if (!string.Equals(runTab, _activeTab, StringComparison.OrdinalIgnoreCase))
+            return null;
+
         return new AgentEvent
         {
             Timestamp = _liveAgentProgressHint.Timestamp,
@@ -13341,7 +13369,6 @@ public partial class ChatWindow : Window
             var targetTab = NormalizeTabName(conv.Tab);
             if (!string.Equals(_activeTab, targetTab, StringComparison.OrdinalIgnoreCase))
             {
-                StopStreamingIfActive();
                 SaveCurrentTabConversationId();
                 PersistPerTabUiState();
                 _activeTab = targetTab;