AX Agent 공통 팝업과 시각 상호작용 렌더를 분리해 메인 창 구조를 정리한다

- ChatWindow.VisualInteractionHelpers.cs를 추가해 메시지 액션 버튼, 선택 스타일, hover 애니메이션, 공통 체크 아이콘 생성을 메인 창 코드 밖으로 이동했다.

- ChatWindow.PopupPresentation.cs를 추가해 공통 테마 팝업 컨테이너, 메뉴 아이템, 구분선, 최근 폴더 컨텍스트 메뉴 구성을 한 곳으로 모았다.

- README와 DEVELOPMENT 문서에 2026-04-06 09:03 (KST) 기준 구조 분리 이력을 반영했다.

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

src/AxCopilot/Views/ChatWindow.PopupPresentation.cs

@@ -0,0 +1,159 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Threading;
+
+namespace AxCopilot.Views;
+
+public partial class ChatWindow
+{
+    private Popup? _sharedContextPopup;
+
+    private (Popup Popup, StackPanel Panel) CreateThemedPopupMenu(
+        UIElement? placementTarget = null,
+        PlacementMode placement = PlacementMode.MousePoint,
+        double minWidth = 200)
+    {
+        _sharedContextPopup?.SetCurrentValue(Popup.IsOpenProperty, false);
+
+        var bg = TryFindResource("LauncherBackground") as Brush ?? Brushes.White;
+        var border = TryFindResource("BorderColor") as Brush ?? Brushes.Gray;
+        var panel = new StackPanel { Margin = new Thickness(2) };
+        var container = new Border
+        {
+            Background = bg,
+            BorderBrush = border,
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(10),
+            Padding = new Thickness(6),
+            MinWidth = minWidth,
+            Child = panel,
+            Effect = new System.Windows.Media.Effects.DropShadowEffect
+            {
+                BlurRadius = 16,
+                ShadowDepth = 3,
+                Opacity = 0.18,
+                Color = Colors.Black,
+                Direction = 270,
+            },
+        };
+
+        var popup = new Popup
+        {
+            Child = container,
+            StaysOpen = false,
+            AllowsTransparency = true,
+            PopupAnimation = PopupAnimation.Fade,
+            Placement = placement,
+            PlacementTarget = placementTarget,
+        };
+
+        _sharedContextPopup = popup;
+        return (popup, panel);
+    }
+
+    private Border CreatePopupMenuItem(
+        Popup popup,
+        string icon,
+        string label,
+        Brush iconBrush,
+        Brush labelBrush,
+        Brush hoverBrush,
+        Action action)
+    {
+        var sp = new StackPanel { Orientation = Orientation.Horizontal };
+        sp.Children.Add(new TextBlock
+        {
+            Text = icon,
+            FontFamily = new FontFamily("Segoe MDL2 Assets"),
+            FontSize = 12.5,
+            Foreground = iconBrush,
+            VerticalAlignment = VerticalAlignment.Center,
+            Margin = new Thickness(0, 0, 9, 0),
+        });
+        sp.Children.Add(new TextBlock
+        {
+            Text = label,
+            FontSize = 12.5,
+            Foreground = labelBrush,
+            VerticalAlignment = VerticalAlignment.Center,
+        });
+
+        var item = new Border
+        {
+            Child = sp,
+            Background = Brushes.Transparent,
+            CornerRadius = new CornerRadius(8),
+            Cursor = Cursors.Hand,
+            Padding = new Thickness(10, 7, 12, 7),
+            Margin = new Thickness(0, 1, 0, 1),
+        };
+        item.MouseEnter += (s, _) => { if (s is Border b) b.Background = hoverBrush; };
+        item.MouseLeave += (s, _) => { if (s is Border b) b.Background = Brushes.Transparent; };
+        item.MouseLeftButtonUp += (_, _) =>
+        {
+            popup.SetCurrentValue(Popup.IsOpenProperty, false);
+            action();
+        };
+
+        return item;
+    }
+
+    private static void AddPopupMenuSeparator(Panel panel, Brush brush)
+    {
+        panel.Children.Add(new Border
+        {
+            Height = 1,
+            Margin = new Thickness(10, 4, 10, 4),
+            Background = brush,
+            Opacity = 0.35,
+        });
+    }
+
+    /// <summary>최근 폴더 항목 우클릭 컨텍스트 메뉴를 표시합니다.</summary>
+    private void ShowRecentFolderContextMenu(string folderPath)
+    {
+        var primaryText = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
+        var secondaryText = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
+        var borderBrush = TryFindResource("BorderColor") as Brush ?? Brushes.Gray;
+        var hoverBg = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.Transparent;
+        var warningBrush = new SolidColorBrush(Color.FromRgb(0xEF, 0x44, 0x44));
+        var (popup, panel) = CreateThemedPopupMenu();
+
+        panel.Children.Add(CreatePopupMenuItem(popup, "\uED25", "폴더 열기", secondaryText, primaryText, hoverBg, () =>
+        {
+            try
+            {
+                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo
+                {
+                    FileName = folderPath,
+                    UseShellExecute = true,
+                });
+            }
+            catch
+            {
+            }
+        }));
+
+        panel.Children.Add(CreatePopupMenuItem(popup, "\uE8C8", "경로 복사", secondaryText, primaryText, hoverBg, () =>
+        {
+            try { Clipboard.SetText(folderPath); } catch { }
+        }));
+
+        AddPopupMenuSeparator(panel, borderBrush);
+
+        panel.Children.Add(CreatePopupMenuItem(popup, "\uE74D", "목록에서 삭제", warningBrush, warningBrush, hoverBg, () =>
+        {
+            _settings.Settings.Llm.RecentWorkFolders.RemoveAll(
+                p => p.Equals(folderPath, StringComparison.OrdinalIgnoreCase));
+            _settings.Save();
+            if (FolderMenuPopup.IsOpen)
+                ShowFolderMenu();
+        }));
+
+        Dispatcher.BeginInvoke(() => { popup.IsOpen = true; }, DispatcherPriority.Input);
+    }
+}