AX Agent 작업 폴더 선택 팝업 스타일 정리 및 최근 항목 UI 개선

- 최근 작업 폴더 팝업 외곽 radius, 그림자, 내부 여백을 조정해 레퍼런스에 더 가까운 카드형 스타일로 보정
- 최근 폴더 항목을 하단 구분선 방식에서 개별 라운드 row 방식으로 변경하고 선택 체크와 텍스트 계층을 정돈
- 다른 폴더 선택 행도 동일한 row 스타일로 통일해 팝업 전체 시각 언어를 일관되게 정리
- README 및 DEVELOPMENT 문서에 2026-04-05 23:28 (KST) 기준 변경 이력 반영

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

src/AxCopilot/Views/ChatWindow.xaml

@@ -1491,22 +1491,22 @@
                     <Border Background="{DynamicResource LauncherBackground}"
                             BorderBrush="{DynamicResource BorderColor}"
                             BorderThickness="1"
-                            CornerRadius="16"
-                            MinWidth="286"
-                            MaxWidth="332">
+                            CornerRadius="18"
+                            MinWidth="300"
+                            MaxWidth="348">
                         <Border.Effect>
-                            <DropShadowEffect BlurRadius="22" ShadowDepth="0" Opacity="0.14"/>
+                            <DropShadowEffect BlurRadius="24" ShadowDepth="0" Opacity="0.12"/>
                         </Border.Effect>
                         <StackPanel Margin="0">
                             <TextBlock Text="최근"
-                                       Margin="16,14,16,10"
-                                       FontSize="12.5"
+                                       Margin="18,16,18,10"
+                                       FontSize="13"
                                        FontWeight="SemiBold"
                                        Foreground="{DynamicResource PrimaryText}"/>
                             <ScrollViewer MaxHeight="360"
                                           VerticalScrollBarVisibility="Auto"
                                           HorizontalScrollBarVisibility="Disabled"
-                                          Padding="10,0,10,10">
+                                          Padding="12,0,12,12">
                                 <StackPanel x:Name="FolderMenuItems" Margin="2"/>
                             </ScrollViewer>
                         </StackPanel>

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -1442,8 +1442,8 @@ public partial class ChatWindow : Window
             {
                 Height = 1,
                 Background = TryFindResource("BorderColor") as Brush ?? Brushes.Gray,
-                Margin = new Thickness(8, 4, 8, 8),
-                Opacity = 0.45,
+                Margin = new Thickness(6, 6, 6, 10),
+                Opacity = 0.35,
             });
             AddWorkspaceRows(remainingFolders);
         }
@@ -1453,9 +1453,9 @@ public partial class ChatWindow : Window
             FolderMenuItems.Children.Add(new TextBlock
             {
                 Text = "최근 작업 폴더가 없습니다.",
-                FontSize = 11.5,
+                FontSize = 12,
                 Foreground = secondaryText,
-                Margin = new Thickness(10, 6, 10, 10),
+                Margin = new Thickness(10, 8, 10, 12),
             });
         }
 
@@ -1463,43 +1463,27 @@ public partial class ChatWindow : Window
         {
             Height = 1,
             Background = TryFindResource("BorderColor") as Brush ?? Brushes.Gray,
-            Margin = new Thickness(8, 8, 8, 8),
-            Opacity = 0.45,
+            Margin = new Thickness(6, 8, 6, 10),
+            Opacity = 0.35,
         });
 
-        // 다른 폴더 선택 버튼
-        var browseSp = new StackPanel { Orientation = Orientation.Horizontal };
-        browseSp.Children.Add(new TextBlock
-        {
-            Text = "\uE710",
-            FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 13,
-            Foreground = accentBrush,
-            VerticalAlignment = VerticalAlignment.Center,
-            Margin = new Thickness(0, 0, 8, 0),
-        });
-        browseSp.Children.Add(new TextBlock
-        {
-            Text = "다른 폴더 선택",
-            FontSize = 13,
-            FontWeight = FontWeights.SemiBold,
-            Foreground = primaryText,
-            VerticalAlignment = VerticalAlignment.Center,
-        });
-        var browseBorder = new Border
-        {
-            Child = browseSp,
-            Background = Brushes.Transparent,
-            CornerRadius = new CornerRadius(8),
-            Cursor = Cursors.Hand,
-            Padding = new Thickness(10, 7, 10, 7),
-        };
-        browseBorder.MouseEnter += (s, _) => { if (s is Border b) b.Background = new SolidColorBrush(Color.FromArgb(0x18, 0xFF, 0xFF, 0xFF)); };
-        browseBorder.MouseLeave += (s, _) => { if (s is Border b) b.Background = Brushes.Transparent; };
+        var browseBorder = CreatePopupMenuRow(
+            "\uE710",
+            "다른 폴더 선택",
+            string.Empty,
+            false,
+            accentBrush,
+            secondaryText,
+            primaryText,
+            () =>
+            {
+                FolderMenuPopup.IsOpen = false;
+                BrowseWorkFolder();
+            });
+        browseBorder.Margin = new Thickness(0);
         browseBorder.MouseLeftButtonUp += (_, _) =>
         {
             FolderMenuPopup.IsOpen = false;
-            BrowseWorkFolder();
         };
         FolderMenuItems.Children.Add(browseBorder);
     }
@@ -13174,16 +13158,17 @@ public partial class ChatWindow : Window
         Brush primaryText,
         Action? onClick)
     {
-        var borderColor = TryFindResource("BorderColor") as Brush ?? BrushFromHex("#E5E7EB");
         var hintBackground = TryFindResource("HintBackground") as Brush ?? BrushFromHex("#F8FAFC");
+        var hoverBackground = TryFindResource("ItemHoverBackground") as Brush ?? BrushFromHex("#F8FAFC");
         var row = new Border
         {
             Background = selected ? hintBackground : Brushes.Transparent,
-            BorderBrush = borderColor,
-            BorderThickness = new Thickness(0, 0, 0, 1),
-            Padding = new Thickness(10, 8, 10, 8),
+            BorderBrush = selected ? BrushFromHex("#D6E4FF") : Brushes.Transparent,
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(12),
+            Padding = new Thickness(12, 10, 12, 10),
             Cursor = Cursors.Hand,
-            Margin = new Thickness(0),
+            Margin = new Thickness(0, 0, 0, 6),
         };
 
         var grid = new Grid();
@@ -13195,10 +13180,10 @@ public partial class ChatWindow : Window
         {
             Text = icon,
             FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 12,
+            FontSize = 14,
             Foreground = selected ? accentBrush : secondaryText,
-            Margin = new Thickness(0, 1, 8, 0),
-            VerticalAlignment = VerticalAlignment.Top,
+            Margin = new Thickness(0, 1, 10, 0),
+            VerticalAlignment = VerticalAlignment.Center,
         };
         grid.Children.Add(iconBlock);
 
@@ -13206,18 +13191,21 @@ public partial class ChatWindow : Window
         textStack.Children.Add(new TextBlock
         {
             Text = title,
-            FontSize = 12,
+            FontSize = 13.5,
             FontWeight = selected ? FontWeights.SemiBold : FontWeights.Medium,
             Foreground = primaryText,
         });
-        textStack.Children.Add(new TextBlock
+        if (!string.IsNullOrWhiteSpace(description))
         {
-            Text = description,
-            FontSize = 10.5,
-            Foreground = secondaryText,
-            Margin = new Thickness(0, 2, 0, 0),
-            TextWrapping = TextWrapping.Wrap,
-        });
+            textStack.Children.Add(new TextBlock
+            {
+                Text = description,
+                FontSize = 11.5,
+                Foreground = secondaryText,
+                Margin = new Thickness(0, 3, 0, 0),
+                TextWrapping = TextWrapping.Wrap,
+            });
+        }
         Grid.SetColumn(textStack, 1);
         grid.Children.Add(textStack);
 
@@ -13225,12 +13213,14 @@ public partial class ChatWindow : Window
         {
             var check = CreateSimpleCheck(accentBrush, 14);
             Grid.SetColumn(check, 2);
+            check.Margin = new Thickness(10, 0, 0, 0);
+            if (check is FrameworkElement element)
+                element.VerticalAlignment = VerticalAlignment.Center;
             grid.Children.Add(check);
         }
 
         row.Child = grid;
-        var hoverBg = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.Transparent;
-        row.MouseEnter += (_, _) => row.Background = selected ? hintBackground : hoverBg;
+        row.MouseEnter += (_, _) => row.Background = selected ? hintBackground : hoverBackground;
         row.MouseLeave += (_, _) => row.Background = selected ? hintBackground : Brushes.Transparent;
         row.MouseLeftButtonUp += (_, _) => onClick?.Invoke();
         return row;