AX Agent 계획 카드를 compact transcript 형태로 마감

- ChatWindow planning card를 기본 접힘 상태의 요약형 카드로 전환

- 단계 목록은 펼치기/접기에서만 보이게 해 claw-code식 읽기 중심 transcript 흐름으로 정리

- README와 DEVELOPMENT 문서에 2026-04-05 21:36 (KST) 기준 100% 마감 판단과 검증 결과 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

@@ -9443,6 +9443,7 @@ public partial class ChatWindow : Window
     private StackPanel? _planStepsPanel;
     private ProgressBar? _planProgressBar;
     private TextBlock? _planProgressText;
+    private TextBlock? _planToggleText;
 
     /// <summary>작업 계획 카드를 생성합니다 (단계 목록 + 진행률 바).</summary>
     private void AddPlanningCard(AgentEvent evt)
@@ -9469,8 +9470,12 @@ public partial class ChatWindow : Window
         var sp = new StackPanel();
 
         // 헤더
-        var header = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(0, 0, 0, 4) };
-        header.Children.Add(new TextBlock
+        var header = new Grid { Margin = new Thickness(0, 0, 0, 4) };
+        header.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
+        header.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
+
+        var headerLeft = new StackPanel { Orientation = Orientation.Horizontal };
+        headerLeft.Children.Add(new TextBlock
         {
             Text = "\uE9D5", // plan icon
             FontFamily = new FontFamily("Segoe MDL2 Assets"),
@@ -9478,7 +9483,7 @@ public partial class ChatWindow : Window
             Foreground = accentBrush,
             VerticalAlignment = VerticalAlignment.Center
         });
-        header.Children.Add(new TextBlock
+        headerLeft.Children.Add(new TextBlock
         {
             Text = $"계획 {steps.Count}단계",
             FontSize = 9, FontWeight = FontWeights.SemiBold,
@@ -9486,6 +9491,28 @@ public partial class ChatWindow : Window
             VerticalAlignment = VerticalAlignment.Center,
             Margin = new Thickness(4, 0, 0, 0),
         });
+        header.Children.Add(headerLeft);
+
+        var toggleWrap = new Border
+        {
+            Background = Brushes.Transparent,
+            BorderBrush = borderBrush,
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(10),
+            Padding = new Thickness(6, 2, 6, 2),
+            Cursor = Cursors.Hand,
+            VerticalAlignment = VerticalAlignment.Center,
+        };
+        _planToggleText = new TextBlock
+        {
+            Text = steps.Count > 0 ? "펼치기" : "",
+            FontSize = 8.25,
+            FontWeight = FontWeights.SemiBold,
+            Foreground = secondaryText,
+        };
+        toggleWrap.Child = _planToggleText;
+        Grid.SetColumn(toggleWrap, 1);
+        header.Children.Add(toggleWrap);
         sp.Children.Add(header);
 
         // 진행률 바
@@ -9521,7 +9548,10 @@ public partial class ChatWindow : Window
         sp.Children.Add(progressGrid);
 
         // 단계 목록
-        _planStepsPanel = new StackPanel();
+        _planStepsPanel = new StackPanel
+        {
+            Visibility = Visibility.Collapsed,
+        };
         for (int i = 0; i < steps.Count; i++)
         {
             var stepRow = new StackPanel
@@ -9554,6 +9584,17 @@ public partial class ChatWindow : Window
         }
         sp.Children.Add(_planStepsPanel);
 
+        toggleWrap.MouseLeftButtonUp += (_, _) =>
+        {
+            if (_planStepsPanel == null || _planToggleText == null)
+                return;
+
+            var expanded = _planStepsPanel.Visibility == Visibility.Visible;
+            _planStepsPanel.Visibility = expanded ? Visibility.Collapsed : Visibility.Visible;
+            _planToggleText.Text = expanded ? "펼치기" : "접기";
+            toggleWrap.Background = expanded ? Brushes.Transparent : BrushFromHex("#F8FAFC");
+        };
+
         card.Child = sp;
         _planningCard = card;