AX Agent 메시지 축 UI 밀도 정리 및 로그 표시 단순화

- ChatWindow 메시지 카드의 여백, 패딩, 라운드, 타임스탬프 크기를 줄여 claw-code 기준의 본문 중심 읽기 흐름으로 정리함

- assistant 헤더와 액션 바, 실행 로그 배너의 아이콘/텍스트/배지 밀도를 낮춰 Cowork/Code에서 로그가 메시지보다 튀지 않도록 조정함

- README와 DEVELOPMENT 문서에 2026-04-05 14:09 (KST) 기준 작업 이력을 반영하고 Release 빌드 경고 0 오류 0을 확인함

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -4440,7 +4440,7 @@ public partial class ChatWindow : Window
             {
                 HorizontalAlignment = HorizontalAlignment.Right,
                 MaxWidth = GetMessageMaxWidth(),
-                Margin = new Thickness(150, 3, 16, 3),
+                Margin = new Thickness(172, 2, 16, 2),
             };
 
             var bubble = new Border
@@ -4448,16 +4448,16 @@ public partial class ChatWindow : Window
                 Background = userBubbleBg,
                 BorderBrush = borderBrush,
                 BorderThickness = new Thickness(1),
-                CornerRadius = new CornerRadius(14),
-                Padding = new Thickness(13, 9, 13, 9),
+                CornerRadius = new CornerRadius(13),
+                Padding = new Thickness(12, 8, 12, 8),
                 Child = new TextBlock
                 {
                     Text = content,
                     TextAlignment = TextAlignment.Left,
-                    FontSize = 12.5,
+                    FontSize = 12,
                     Foreground = primaryText,
                     TextWrapping = TextWrapping.Wrap,
-                    LineHeight = 20,
+                    LineHeight = 19,
                 }
             };
             wrapper.Children.Add(bubble);
@@ -4485,11 +4485,11 @@ public partial class ChatWindow : Window
             userBottomBar.Children.Add(new TextBlock
             {
                 Text = timestamp.ToString("HH:mm"),
-                FontSize = 9, Opacity = 0.52,
+                FontSize = 8.5, Opacity = 0.46,
                 Foreground = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray,
                 HorizontalAlignment = HorizontalAlignment.Right,
                 VerticalAlignment = VerticalAlignment.Center,
-                Margin = new Thickness(0, 0, 4, 0),
+                Margin = new Thickness(0, 0, 3, 0),
             });
             userBottomBar.Children.Add(userActionBar);
             wrapper.Children.Add(userBottomBar);
@@ -4523,19 +4523,19 @@ public partial class ChatWindow : Window
             {
                 HorizontalAlignment = HorizontalAlignment.Left,
                 MaxWidth = GetMessageMaxWidth(),
-                Margin = new Thickness(10, 3, 150, 3)
+                Margin = new Thickness(6, 2, 180, 2)
             };
             if (animate) ApplyMessageEntryAnimation(container);
 
             // AI 에이전트 이름 + 아이콘
             var (agentName, _, _) = GetAgentIdentity();
-            var headerSp = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(2, 0, 0, 2) };
+            var headerSp = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(3, 0, 0, 1) };
 
             var iconBlock = new TextBlock
             {
                 Text = "\uE945",
                 FontFamily = new FontFamily("Segoe MDL2 Assets"),
-                FontSize = 8,
+                FontSize = 7.5,
                 Foreground = secondaryText,
                 VerticalAlignment = VerticalAlignment.Center,
             };
@@ -4544,10 +4544,10 @@ public partial class ChatWindow : Window
             headerSp.Children.Add(new TextBlock
             {
                 Text = agentName,
-                FontSize = 9,
-                FontWeight = FontWeights.Medium,
+                FontSize = 8.5,
+                FontWeight = FontWeights.Normal,
                 Foreground = secondaryText,
-                Margin = new Thickness(4, 0, 0, 0),
+                Margin = new Thickness(3, 0, 0, 0),
                 VerticalAlignment = VerticalAlignment.Center,
             });
             container.Children.Add(headerSp);
@@ -4557,8 +4557,8 @@ public partial class ChatWindow : Window
                 Background = assistantBubbleBg,
                 BorderBrush = borderBrush,
                 BorderThickness = new Thickness(1),
-                CornerRadius = new CornerRadius(14),
-                Padding = new Thickness(13, 10, 13, 10),
+                CornerRadius = new CornerRadius(13),
+                Padding = new Thickness(12, 8, 12, 8),
             };
             var contentStack = new StackPanel();
 
@@ -4687,7 +4687,7 @@ public partial class ChatWindow : Window
             {
                 Orientation = Orientation.Horizontal,
                 HorizontalAlignment = HorizontalAlignment.Left,
-                Margin = new Thickness(2, 2, 0, 0),
+                Margin = new Thickness(2, 1, 0, 0),
                 Opacity = 0
             };
 
@@ -4707,10 +4707,10 @@ public partial class ChatWindow : Window
             actionBar.Children.Add(new TextBlock
             {
                 Text = aiTimestamp.ToString("HH:mm"),
-                FontSize = 9, Opacity = 0.52,
+                FontSize = 8.5, Opacity = 0.46,
                 Foreground = btnColor,
                 VerticalAlignment = VerticalAlignment.Center,
-                Margin = new Thickness(6, 0, 0, 0),
+                Margin = new Thickness(4, 0, 0, 0),
             });
 
             container.Children.Add(actionBar);
@@ -4944,8 +4944,8 @@ public partial class ChatWindow : Window
             BorderBrush = borderBrush,
             BorderThickness = new Thickness(1),
             Cursor = Cursors.Hand,
-            Padding = new Thickness(8, 4, 8, 4),
-            Margin = new Thickness(0, 0, 4, 0),
+            Padding = new Thickness(7, 3, 7, 3),
+            Margin = new Thickness(0, 0, 3, 0),
             ToolTip = tooltip
         };
         btn.Template = BuildMinimalIconButtonTemplate();
@@ -10493,7 +10493,7 @@ public partial class ChatWindow : Window
             BorderThickness = new Thickness(0),
             CornerRadius = new CornerRadius(0),
             Padding = new Thickness(0),
-            Margin = new Thickness(24, 2, 24, 2),
+            Margin = new Thickness(18, 1, 18, 1),
             HorizontalAlignment = HorizontalAlignment.Stretch,
         };
         if (!string.IsNullOrWhiteSpace(evt.RunId))
@@ -10512,16 +10512,16 @@ public partial class ChatWindow : Window
         {
             Text = icon,
             FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 10.5,
+            FontSize = 10,
             Foreground = accentBrush,
             VerticalAlignment = VerticalAlignment.Center,
-            Margin = new Thickness(0, 0, 6, 0),
+            Margin = new Thickness(0, 0, 5, 0),
         });
         headerLeft.Children.Add(new TextBlock
         {
             Text = label,
-            FontSize = 10.5,
-            FontWeight = FontWeights.SemiBold,
+            FontSize = 10,
+            FontWeight = FontWeights.Medium,
             Foreground = secondaryText,
             VerticalAlignment = VerticalAlignment.Center,
         });
@@ -10534,10 +10534,10 @@ public partial class ChatWindow : Window
             headerRight.Children.Add(new TextBlock
             {
                 Text = evt.ElapsedMs < 1000 ? $"{evt.ElapsedMs}ms" : $"{evt.ElapsedMs / 1000.0:F1}s",
-                FontSize = 10,
+                FontSize = 9.5,
                 Foreground = secondaryText,
                 VerticalAlignment = VerticalAlignment.Center,
-                Margin = new Thickness(8, 0, 0, 0),
+                Margin = new Thickness(6, 0, 0, 0),
             });
         }
         if (logLevel != "simple" && (evt.InputTokens > 0 || evt.OutputTokens > 0))
@@ -10552,12 +10552,12 @@ public partial class ChatWindow : Window
                 BorderThickness = new Thickness(1),
                 CornerRadius = new CornerRadius(999),
                 Padding = new Thickness(5, 1, 5, 1),
-                Margin = new Thickness(6, 0, 0, 0),
+                Margin = new Thickness(5, 0, 0, 0),
                 VerticalAlignment = VerticalAlignment.Center,
                 Child = new TextBlock
                 {
                     Text = tokenText,
-                    FontSize = 9.5,
+                    FontSize = 9,
                     Foreground = secondaryText,
                     FontFamily = new FontFamily("Consolas"),
                 },
@@ -10584,11 +10584,11 @@ public partial class ChatWindow : Window
                 sp.Children.Add(new TextBlock
                 {
                     Text = shortSummary,
-                    FontSize = 10.5,
+                    FontSize = 10,
                     Foreground = secondaryText,
                     TextWrapping = TextWrapping.NoWrap,
                     TextTrimming = TextTrimming.CharacterEllipsis,
-                    Margin = new Thickness(16, 2, 0, 0),
+                    Margin = new Thickness(15, 1, 0, 0),
                 });
             }
         }
@@ -10599,10 +10599,10 @@ public partial class ChatWindow : Window
             sp.Children.Add(new TextBlock
             {
                 Text = summaryText,
-                FontSize = 10.5,
-                Foreground = primaryText,
+                FontSize = 10,
+                Foreground = secondaryText,
                 TextWrapping = TextWrapping.Wrap,
-                Margin = new Thickness(16, 2, 0, 0),
+                Margin = new Thickness(15, 1, 0, 0),
             });
         }
 
@@ -10613,7 +10613,7 @@ public partial class ChatWindow : Window
             summary: evt.Summary);
         if (reviewChipRow != null)
         {
-            reviewChipRow.Margin = new Thickness(16, 4, 0, 0);
+            reviewChipRow.Margin = new Thickness(15, 3, 0, 0);
             sp.Children.Add(reviewChipRow);
         }