AX Agent 좌측 패널 글자 크기 및 대화 목록 가독성 개선

- 좌측 사이드바 폭을 소폭 확장하고 헤더, 새 대화, 검색, 상단 필터, 보조 메뉴, 전체 삭제, 사용자 영역 타이포와 아이콘 크기 상향
- 대화 목록 그룹 헤더, 제목, 날짜, 실행 상태, 실행 요약, 편집 아이콘 크기와 카드 패딩 조정
- 좌측 패널 텍스트가 지나치게 작아 보이던 문제를 전체 시각 균형 기준으로 보정
- README 및 DEVELOPMENT 문서에 2026-04-05 23:09 (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

@@ -418,7 +418,7 @@
                 <!-- 축소 아이콘 바 (사이드바 닫힘 시 표시) -->
                 <ColumnDefinition x:Name="IconBarColumn" Width="0"/>
                 <!-- 사이드바 (열림 시 표시) -->
-                <ColumnDefinition x:Name="SidebarColumn" Width="246" MinWidth="0"/>
+            <ColumnDefinition x:Name="SidebarColumn" Width="262" MinWidth="0"/>
                 <ColumnDefinition Width="*"/>
                 <!-- 미리보기 스플리터 -->
                 <ColumnDefinition x:Name="SplitterColumn" Width="0"/>
@@ -501,7 +501,7 @@
                     <!-- 헤더 -->
                     <Grid Grid.Row="0" Margin="12,0,12,0">
                         <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
-                            <TextBlock Text="AX Agent" FontSize="11" FontWeight="SemiBold"
+                            <TextBlock Text="AX Agent" FontSize="13.5" FontWeight="SemiBold"
                                        Foreground="{DynamicResource PrimaryText}"
                                        VerticalAlignment="Center"/>
                         </StackPanel>
@@ -524,17 +524,17 @@
                                         <ColumnDefinition Width="*"/>
                                         <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <TextBlock Text="&#xE710;" FontFamily="Segoe MDL2 Assets" FontSize="11.5"
+                                    <TextBlock Text="&#xE710;" FontFamily="Segoe MDL2 Assets" FontSize="13"
                                                Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     <TextBlock Grid.Column="1" Text="새 대화"
                                                Foreground="{DynamicResource PrimaryText}"
-                                               FontSize="12.5" FontWeight="SemiBold" Margin="8,0,0,0" VerticalAlignment="Center"/>
+                                               FontSize="14.25" FontWeight="SemiBold" Margin="8,0,0,0" VerticalAlignment="Center"/>
                                     <TextBlock x:Name="SidebarNewChatShortcutHint"
                                                Grid.Column="2"
                                                Text="Ctrl+N"
                                                Visibility="Collapsed"
                                                Foreground="{DynamicResource SecondaryText}"
-                                               FontSize="10.5"
+                                               FontSize="11.5"
                                                VerticalAlignment="Center"/>
                                 </Grid>
                             </Border>
@@ -553,17 +553,17 @@
                                         <ColumnDefinition Width="*"/>
                                         <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="11.5"
+                                    <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="13"
                                                Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     <TextBlock Grid.Column="1" Text="검색"
                                                Foreground="{DynamicResource PrimaryText}"
-                                               FontSize="12.5" FontWeight="SemiBold" Margin="8,0,0,0" VerticalAlignment="Center"/>
+                                               FontSize="14.25" FontWeight="SemiBold" Margin="8,0,0,0" VerticalAlignment="Center"/>
                                     <TextBlock x:Name="SidebarSearchShortcutHint"
                                                Grid.Column="2"
                                                Text="Ctrl+K"
                                                Visibility="Collapsed"
                                                Foreground="{DynamicResource SecondaryText}"
-                                               FontSize="10.5"
+                                               FontSize="11.5"
                                                VerticalAlignment="Center"/>
                                 </Grid>
                             </Border>
@@ -586,12 +586,12 @@
                                         <ColumnDefinition Width="Auto"/>
                                         <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="12.5"
+                                    <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="13.5"
                                                Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     <TextBox x:Name="SearchBox" Grid.Column="1"
                                              Background="Transparent" BorderThickness="0"
                                              Foreground="{DynamicResource PrimaryText}"
-                                             CaretBrush="{DynamicResource AccentColor}" FontSize="12.5"
+                                             CaretBrush="{DynamicResource AccentColor}" FontSize="13.5"
                                              VerticalAlignment="Center" Margin="9,0,7,0"
                                              TextChanged="SearchBox_TextChanged"/>
                                     <Button x:Name="BtnConversationSort" Grid.Column="2"
@@ -607,7 +607,7 @@
                                                        Foreground="{DynamicResource SecondaryText}"
                                                        VerticalAlignment="Center" Margin="0,0,4,0"/>
                                             <TextBlock x:Name="ConversationSortLabel" Text="활동"
-                                                       FontSize="11.5" FontWeight="SemiBold"
+                                                       FontSize="12.5" FontWeight="SemiBold"
                                                        Foreground="{DynamicResource SecondaryText}"
                                                        VerticalAlignment="Center"/>
                                             </StackPanel>
@@ -626,7 +626,7 @@
                                                        Foreground="{DynamicResource SecondaryText}"
                                                        VerticalAlignment="Center" Margin="0,0,4,0"/>
                                             <TextBlock x:Name="RunningOnlyFilterLabel" Text="진행"
-                                                       FontSize="11.5" FontWeight="SemiBold"
+                                                       FontSize="12.5" FontWeight="SemiBold"
                                                        Foreground="{DynamicResource SecondaryText}"
                                                        VerticalAlignment="Center"/>
                                         </StackPanel>
@@ -655,11 +655,11 @@
                             <Grid HorizontalAlignment="Stretch">
                                 <StackPanel Orientation="Horizontal">
                                     <TextBlock x:Name="CategoryIcon" Text="&#xE8BD;"
-                                               FontFamily="Segoe MDL2 Assets" FontSize="11.5"
+                                               FontFamily="Segoe MDL2 Assets" FontSize="13"
                                                Foreground="{DynamicResource AccentColor}"
                                                VerticalAlignment="Center" Margin="0,0,7,0"/>
                                     <TextBlock x:Name="CategoryLabel" Text="모든 주제"
-                                               FontSize="12" FontWeight="SemiBold"
+                                               FontSize="13.5" FontWeight="SemiBold"
                                                Foreground="{DynamicResource PrimaryText}"
                                                VerticalAlignment="Center"/>
                                 </StackPanel>
@@ -680,11 +680,11 @@
                         <StackPanel>
                             <StackPanel Orientation="Horizontal" Margin="0,0,0,4" Visibility="Collapsed">
                                 <TextBlock x:Name="SidebarModeBadgeIcon" Text="&#xE8BD;"
-                                           FontFamily="Segoe MDL2 Assets" FontSize="11.5"
+                                           FontFamily="Segoe MDL2 Assets" FontSize="12.5"
                                            Foreground="{DynamicResource AccentColor}"
                                            VerticalAlignment="Center" Margin="0,0,6,0"/>
                                 <TextBlock x:Name="SidebarModeBadgeTitle" Text="Chat 메뉴"
-                                           FontSize="11.75" FontWeight="SemiBold"
+                                           FontSize="13" FontWeight="SemiBold"
                                            Foreground="{DynamicResource PrimaryText}"
                                            VerticalAlignment="Center"/>
                             </StackPanel>
@@ -699,11 +699,11 @@
                                             <ColumnDefinition Width="*"/>
                                             <ColumnDefinition Width="Auto"/>
                                         </Grid.ColumnDefinitions>
-                                        <TextBlock Text="&#xE8BD;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                        <TextBlock Text="&#xE8BD;" FontFamily="Segoe MDL2 Assets" FontSize="12.5"
                                                    Foreground="{DynamicResource AccentColor}" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="1" Text="주제"
                                                    Foreground="{DynamicResource PrimaryText}"
-                                                   FontSize="12" Margin="7,0,0,0" VerticalAlignment="Center"/>
+                                                   FontSize="13.25" Margin="7,0,0,0" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="2" Text="&#xE70D;" FontFamily="Segoe MDL2 Assets" FontSize="9.5"
                                                    Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     </Grid>
@@ -718,14 +718,14 @@
                                             <ColumnDefinition Width="*"/>
                                             <ColumnDefinition Width="Auto"/>
                                         </Grid.ColumnDefinitions>
-                                        <TextBlock Text="&#xE768;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                        <TextBlock Text="&#xE768;" FontFamily="Segoe MDL2 Assets" FontSize="12.5"
                                                    Foreground="#22C55E" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="1" Text="진행 중 대화만 보기"
                                                    Foreground="{DynamicResource PrimaryText}"
-                                                   FontSize="12" Margin="7,0,0,0" VerticalAlignment="Center"/>
+                                                   FontSize="13.25" Margin="7,0,0,0" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="2" x:Name="SidebarChatRunningState" Text="OFF"
                                                    Foreground="{DynamicResource SecondaryText}"
-                                                   FontSize="10.75" VerticalAlignment="Center"/>
+                                                   FontSize="11.75" VerticalAlignment="Center"/>
                                     </Grid>
                                 </Border>
                             </StackPanel>
@@ -740,11 +740,11 @@
                                             <ColumnDefinition Width="*"/>
                                             <ColumnDefinition Width="Auto"/>
                                         </Grid.ColumnDefinitions>
-                                        <TextBlock Text="&#xE8FD;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                        <TextBlock Text="&#xE8FD;" FontFamily="Segoe MDL2 Assets" FontSize="12.5"
                                                    Foreground="#3B82F6" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="1" Text="작업 유형"
                                                    Foreground="{DynamicResource PrimaryText}"
-                                                   FontSize="12" Margin="7,0,0,0" VerticalAlignment="Center"/>
+                                                   FontSize="13.25" Margin="7,0,0,0" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="2" Text="&#xE70D;" FontFamily="Segoe MDL2 Assets" FontSize="9.5"
                                                    Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     </Grid>
@@ -761,11 +761,11 @@
                                             <ColumnDefinition Width="*"/>
                                             <ColumnDefinition Width="Auto"/>
                                         </Grid.ColumnDefinitions>
-                                        <TextBlock Text="&#xE943;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                        <TextBlock Text="&#xE943;" FontFamily="Segoe MDL2 Assets" FontSize="12.5"
                                                    Foreground="#3B82F6" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="1" Text="워크스페이스"
                                                    Foreground="{DynamicResource PrimaryText}"
-                                                   FontSize="12" Margin="7,0,0,0" VerticalAlignment="Center"/>
+                                                   FontSize="13.25" Margin="7,0,0,0" VerticalAlignment="Center"/>
                                         <TextBlock Grid.Column="2" Text="&#xE70D;" FontFamily="Segoe MDL2 Assets" FontSize="9.5"
                                                    Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     </Grid>
@@ -787,9 +787,9 @@
                                 HorizontalAlignment="Center" VerticalAlignment="Center"
                                 Click="BtnDeleteAll_Click">
                             <StackPanel Orientation="Horizontal">
-                                <TextBlock Text="&#xE74D;" FontFamily="Segoe MDL2 Assets" FontSize="9.75"
+                                <TextBlock Text="&#xE74D;" FontFamily="Segoe MDL2 Assets" FontSize="11"
                                            Foreground="#AA5555" VerticalAlignment="Center" Margin="0,0,4,0"/>
-                                <TextBlock Text="전체 삭제" FontSize="9.75" Foreground="#AA5555"/>
+                                <TextBlock Text="전체 삭제" FontSize="11" Foreground="#AA5555"/>
                             </StackPanel>
                         </Button>
                     </Border>
@@ -802,32 +802,32 @@
                                 <ColumnDefinition Width="*"/>
                                 <ColumnDefinition Width="Auto"/>
                             </Grid.ColumnDefinitions>
-                            <Border Grid.Column="0" Width="28" Height="28" CornerRadius="14"
+                            <Border Grid.Column="0" Width="32" Height="32" CornerRadius="16"
                                     Background="{DynamicResource HintBackground}"
                                     BorderBrush="{DynamicResource BorderColor}"
                                     BorderThickness="1"
                                     Margin="0,0,8,0">
-                                <TextBlock x:Name="UserInitialSidebar" Text="U" FontSize="11.5" FontWeight="SemiBold"
+                                <TextBlock x:Name="UserInitialSidebar" Text="U" FontSize="13" FontWeight="SemiBold"
                                            Foreground="{DynamicResource PrimaryText}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                             </Border>
                             <StackPanel Grid.Column="1" VerticalAlignment="Center">
-                                <TextBlock x:Name="UserNameText" Text="" FontSize="10.5" FontWeight="SemiBold"
+                                <TextBlock x:Name="UserNameText" Text="" FontSize="12.5" FontWeight="SemiBold"
                                            Foreground="{DynamicResource PrimaryText}"
                                            TextTrimming="CharacterEllipsis"/>
-                                <TextBlock x:Name="UserPcText" Text="" FontSize="8.75"
+                                <TextBlock x:Name="UserPcText" Text="" FontSize="10.5"
                                            Foreground="{DynamicResource SecondaryText}"/>
                             </StackPanel>
                             <Button x:Name="BtnSidebarSettings"
                                     Grid.Column="2"
                                     Style="{StaticResource GhostBtn}"
-                                    Width="32" Height="32"
+                                    Width="34" Height="34"
                                     Margin="6,0,0,0"
                                     VerticalAlignment="Center"
                                     Click="BtnSettings_Click"
                                     ToolTip="AX Agent 설정">
                                 <TextBlock Text="&#xE713;"
                                            FontFamily="Segoe MDL2 Assets"
-                                           FontSize="15"
+                                           FontSize="16.5"
                                            Foreground="{DynamicResource SecondaryText}"
                                            HorizontalAlignment="Center"
                                            VerticalAlignment="Center"/>

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -3187,10 +3187,10 @@ public partial class ChatWindow : Window
         var header = new TextBlock
         {
             Text = text,
-            FontSize = 10.5,
+            FontSize = 12,
             FontWeight = FontWeights.SemiBold,
             Foreground = (TryFindResource("SecondaryText") as Brush ?? Brushes.Gray),
-            Margin = new Thickness(8, 10, 0, 3)
+            Margin = new Thickness(8, 10, 0, 4)
         };
         ConversationPanel.Children.Add(header);
     }
@@ -3208,7 +3208,7 @@ public partial class ChatWindow : Window
                 ? new SolidColorBrush(Color.FromArgb(0x10, 0x4B, 0x5E, 0xFC))
                 : Brushes.Transparent,
             CornerRadius = new CornerRadius(5),
-            Padding = new Thickness(6, 3.5, 6, 3.5),
+            Padding = new Thickness(7, 4.5, 7, 4.5),
             Margin = isBranch ? new Thickness(10, 1, 0, 1) : new Thickness(0, 1, 0, 1),
             Cursor = Cursors.Hand
         };
@@ -3233,7 +3233,7 @@ public partial class ChatWindow : Window
         {
             Text = iconText,
             FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 9.25,
+            FontSize = 10.5,
             Foreground = iconBrush,
             VerticalAlignment = VerticalAlignment.Center
         };
@@ -3248,7 +3248,7 @@ public partial class ChatWindow : Window
         var title = new TextBlock
         {
             Text = item.Title,
-            FontSize = 10,
+            FontSize = 11.75,
             FontWeight = isSelected ? FontWeights.SemiBold : FontWeights.Normal,
             Foreground = titleColor,
             TextTrimming = TextTrimming.CharacterEllipsis
@@ -3256,9 +3256,9 @@ public partial class ChatWindow : Window
         var date = new TextBlock
         {
             Text = item.UpdatedAtText,
-            FontSize = 7.6,
+            FontSize = 9,
             Foreground = dateColor,
-            Margin = new Thickness(0, 1, 0, 0)
+            Margin = new Thickness(0, 1.5, 0, 0)
         };
         stack.Children.Add(title);
         stack.Children.Add(date);
@@ -3269,10 +3269,10 @@ public partial class ChatWindow : Window
                 Text = _appState.ActiveTasks.Count > 0
                     ? $"진행 중 {_appState.ActiveTasks.Count}"
                     : "진행 중",
-                FontSize = 7.4,
+                FontSize = 8.8,
                 FontWeight = FontWeights.Medium,
                 Foreground = BrushFromHex("#4F46E5"),
-                Margin = new Thickness(0, 1, 0, 0),
+                Margin = new Thickness(0, 1.5, 0, 0),
             });
         }
         if (item.AgentRunCount > 0)
@@ -3282,11 +3282,11 @@ public partial class ChatWindow : Window
                 Text = item.FailedAgentRunCount > 0
                     ? $"실패 {item.FailedAgentRunCount} · {TruncateForStatus(item.LastAgentRunSummary, 26)}"
                     : $"실행 {item.AgentRunCount} · {TruncateForStatus(item.LastAgentRunSummary, 28)}",
-                FontSize = 7.45,
+                FontSize = 8.9,
                 Foreground = item.FailedAgentRunCount > 0
                     ? BrushFromHex("#B91C1C")
                     : (TryFindResource("SecondaryText") as Brush ?? Brushes.Gray),
-                Margin = new Thickness(0, 1, 0, 0),
+                Margin = new Thickness(0, 1.5, 0, 0),
                 TextTrimming = TextTrimming.CharacterEllipsis
             };
             if (!string.IsNullOrWhiteSpace(item.LastAgentRunSummary))
@@ -3307,7 +3307,7 @@ public partial class ChatWindow : Window
             {
                 Text = "\uE70F", // Edit
                 FontFamily = new FontFamily("Segoe MDL2 Assets"),
-                FontSize = 7.6,
+                FontSize = 9,
                 Foreground = (TryFindResource("SecondaryText") as Brush ?? Brushes.Gray)
             },
             Background = Brushes.Transparent,
@@ -3315,8 +3315,8 @@ public partial class ChatWindow : Window
             Cursor = Cursors.Hand,
             VerticalAlignment = VerticalAlignment.Center,
             Visibility = Visibility.Collapsed,
-            Width = 18,
-            Height = 18,
+            Width = 20,
+            Height = 20,
             Padding = new Thickness(0),
             Opacity = 0.72,
             ToolTip = _activeTab == "Cowork" ? "작업 유형" : "대화 주제 변경"