AX Agent 사이드바와 대화 목록 밀도 대폭 정리

- 좌측 헤더, 액션, 검색 편집기, 필터, 탭별 메뉴, 삭제/사용자 영역을 전반적으로 축소해 claw-code 쪽 비율로 정리

- 사이드바 폭을 248로 줄이고 대화 목록 카드 패딩, 메타, 편집 버튼, 선택 액센트 바 두께를 함께 축소

- README와 DEVELOPMENT 문서에 2026-04-05 17:53 (KST) 기준 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)

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -2879,12 +2879,12 @@ public partial class ChatWindow : Window
 
             if (animated)
             {
-                AnimateSidebar(0, 270, () => SidebarColumn.MinWidth = 200);
+                AnimateSidebar(0, 248, () => SidebarColumn.MinWidth = 184);
             }
             else
             {
-                SidebarColumn.MinWidth = 200;
-                SidebarColumn.Width = new GridLength(270);
+                SidebarColumn.MinWidth = 184;
+                SidebarColumn.Width = new GridLength(248);
             }
             return;
         }
@@ -2892,7 +2892,7 @@ public partial class ChatWindow : Window
         SidebarColumn.MinWidth = 0;
         if (animated)
         {
-            AnimateSidebar(270, 0, () =>
+            AnimateSidebar(248, 0, () =>
             {
                 SidebarPanel.Visibility = Visibility.Collapsed;
                 IconBarColumn.Width = new GridLength(52);
@@ -3229,14 +3229,14 @@ public partial class ChatWindow : Window
             Background = isSelected
                 ? new SolidColorBrush(Color.FromArgb(0x10, 0x4B, 0x5E, 0xFC))
                 : Brushes.Transparent,
-            CornerRadius = new CornerRadius(6),
-            Padding = new Thickness(7, 4, 7, 4),
-            Margin = isBranch ? new Thickness(12, 1, 0, 1) : new Thickness(0, 1, 0, 1),
+            CornerRadius = new CornerRadius(5),
+            Padding = new Thickness(6, 3.5, 6, 3.5),
+            Margin = isBranch ? new Thickness(10, 1, 0, 1) : new Thickness(0, 1, 0, 1),
             Cursor = Cursors.Hand
         };
 
         var grid = new Grid();
-        grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(18) });
+        grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(16) });
         grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
         grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
 
@@ -3255,7 +3255,7 @@ public partial class ChatWindow : Window
         {
             Text = iconText,
             FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 10,
+            FontSize = 9.25,
             Foreground = iconBrush,
             VerticalAlignment = VerticalAlignment.Center
         };
@@ -3270,7 +3270,7 @@ public partial class ChatWindow : Window
         var title = new TextBlock
         {
             Text = item.Title,
-            FontSize = 10.5,
+            FontSize = 10,
             FontWeight = isSelected ? FontWeights.SemiBold : FontWeights.Normal,
             Foreground = titleColor,
             TextTrimming = TextTrimming.CharacterEllipsis
@@ -3278,7 +3278,7 @@ public partial class ChatWindow : Window
         var date = new TextBlock
         {
             Text = item.UpdatedAtText,
-            FontSize = 8,
+            FontSize = 7.6,
             Foreground = dateColor,
             Margin = new Thickness(0, 1, 0, 0)
         };
@@ -3291,10 +3291,10 @@ public partial class ChatWindow : Window
                 Text = _appState.ActiveTasks.Count > 0
                     ? $"진행 중 {_appState.ActiveTasks.Count}"
                     : "진행 중",
-                FontSize = 7.75,
+                FontSize = 7.4,
                 FontWeight = FontWeights.Medium,
                 Foreground = BrushFromHex("#4F46E5"),
-                Margin = new Thickness(0, 1.5, 0, 0),
+                Margin = new Thickness(0, 1, 0, 0),
             });
         }
         if (item.AgentRunCount > 0)
@@ -3304,11 +3304,11 @@ public partial class ChatWindow : Window
                 Text = item.FailedAgentRunCount > 0
                     ? $"실패 {item.FailedAgentRunCount} · {TruncateForStatus(item.LastAgentRunSummary, 26)}"
                     : $"실행 {item.AgentRunCount} · {TruncateForStatus(item.LastAgentRunSummary, 28)}",
-                FontSize = 7.9,
+                FontSize = 7.45,
                 Foreground = item.FailedAgentRunCount > 0
                     ? BrushFromHex("#B91C1C")
                     : (TryFindResource("SecondaryText") as Brush ?? Brushes.Gray),
-                Margin = new Thickness(0, 1.5, 0, 0),
+                Margin = new Thickness(0, 1, 0, 0),
                 TextTrimming = TextTrimming.CharacterEllipsis
             };
             if (!string.IsNullOrWhiteSpace(item.LastAgentRunSummary))
@@ -3329,7 +3329,7 @@ public partial class ChatWindow : Window
             {
                 Text = "\uE70F", // Edit
                 FontFamily = new FontFamily("Segoe MDL2 Assets"),
-                FontSize = 8,
+                FontSize = 7.6,
                 Foreground = (TryFindResource("SecondaryText") as Brush ?? Brushes.Gray)
             },
             Background = Brushes.Transparent,
@@ -3337,8 +3337,8 @@ public partial class ChatWindow : Window
             Cursor = Cursors.Hand,
             VerticalAlignment = VerticalAlignment.Center,
             Visibility = Visibility.Collapsed,
-            Width = 20,
-            Height = 20,
+            Width = 18,
+            Height = 18,
             Padding = new Thickness(0),
             Opacity = 0.72,
             ToolTip = _activeTab == "Cowork" ? "작업 유형" : "대화 주제 변경"
@@ -3352,7 +3352,7 @@ public partial class ChatWindow : Window
         if (isSelected)
         {
             border.BorderBrush = TryFindResource("AccentColor") as Brush ?? Brushes.CornflowerBlue;
-            border.BorderThickness = new Thickness(1.5, 0, 0, 0);
+            border.BorderThickness = new Thickness(1.25, 0, 0, 0);
         }
 
         border.Child = grid;