AX Agent 사이드바 상호작용 프레젠테이션 분리 및 구조 개선 후속 정리

- ChatWindow에서 검색/새 대화 사이드바 interaction을 SidebarInteractionPresentation partial로 분리
- 검색 열기/닫기 애니메이션과 hover 상태 변경을 메인 창 orchestration 코드 밖으로 이동
- README와 DEVELOPMENT 문서에 2026-04-06 11:03 (KST) 기준 구조 개선 완료 범위와 남은 후속 작업 수준 반영
- dotnet build 검증 경고 0, 오류 0 확인

src/AxCopilot/Views/ChatWindow.SidebarInteractionPresentation.cs

@@ -0,0 +1,107 @@
+using System;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Threading;
+
+namespace AxCopilot.Views;
+
+public partial class ChatWindow
+{
+    private void SidebarSearchTrigger_MouseEnter(object sender, MouseEventArgs e)
+    {
+        if (SidebarSearchTrigger != null)
+            SidebarSearchTrigger.Background = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.Transparent;
+        if (SidebarSearchShortcutHint != null)
+            SidebarSearchShortcutHint.Visibility = Visibility.Visible;
+    }
+
+    private void SidebarSearchTrigger_MouseLeave(object sender, MouseEventArgs e)
+    {
+        if (SidebarSearchTrigger != null)
+            SidebarSearchTrigger.Background = Brushes.Transparent;
+        if (SidebarSearchShortcutHint != null)
+            SidebarSearchShortcutHint.Visibility = Visibility.Collapsed;
+    }
+
+    private void SidebarSearchTrigger_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
+    {
+        OpenSidebarSearch();
+    }
+
+    private void SidebarNewChatTrigger_MouseEnter(object sender, MouseEventArgs e)
+    {
+        if (SidebarNewChatTrigger != null)
+            SidebarNewChatTrigger.Background = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.Transparent;
+        if (SidebarNewChatShortcutHint != null)
+            SidebarNewChatShortcutHint.Visibility = Visibility.Visible;
+    }
+
+    private void SidebarNewChatTrigger_MouseLeave(object sender, MouseEventArgs e)
+    {
+        if (SidebarNewChatTrigger != null)
+            SidebarNewChatTrigger.Background = Brushes.Transparent;
+        if (SidebarNewChatShortcutHint != null)
+            SidebarNewChatShortcutHint.Visibility = Visibility.Collapsed;
+    }
+
+    private void SidebarNewChatTrigger_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
+    {
+        BtnNewChat_Click(sender, new RoutedEventArgs());
+    }
+
+    private void BtnSidebarSearchClose_Click(object sender, RoutedEventArgs e)
+    {
+        CloseSidebarSearch(clearText: true);
+    }
+
+    private void OpenSidebarSearch()
+    {
+        if (SidebarSearchEditor == null || SidebarSearchTrigger == null || SidebarSearchEditorScale == null)
+            return;
+
+        SidebarSearchTrigger.Visibility = Visibility.Collapsed;
+        SidebarSearchEditor.Visibility = Visibility.Visible;
+        SidebarSearchEditor.Opacity = 0;
+        SidebarSearchEditorScale.ScaleX = 0.85;
+
+        var duration = TimeSpan.FromMilliseconds(160);
+        SidebarSearchEditor.BeginAnimation(OpacityProperty, new DoubleAnimation(0, 1, duration));
+        SidebarSearchEditorScale.BeginAnimation(System.Windows.Media.ScaleTransform.ScaleXProperty, new DoubleAnimation(0.85, 1, duration)
+        {
+            EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
+        });
+
+        Dispatcher.BeginInvoke(new Action(() =>
+        {
+            SearchBox?.Focus();
+            SearchBox?.SelectAll();
+        }), DispatcherPriority.Background);
+    }
+
+    private void CloseSidebarSearch(bool clearText)
+    {
+        if (SidebarSearchEditor == null || SidebarSearchTrigger == null || SidebarSearchEditorScale == null)
+            return;
+
+        if (clearText && SearchBox != null && !string.IsNullOrEmpty(SearchBox.Text))
+            SearchBox.Text = "";
+
+        var duration = TimeSpan.FromMilliseconds(140);
+        var opacityAnim = new DoubleAnimation(1, 0, duration);
+        opacityAnim.Completed += (_, _) =>
+        {
+            SidebarSearchEditor.Visibility = Visibility.Collapsed;
+            SidebarSearchTrigger.Visibility = Visibility.Visible;
+            SidebarSearchTrigger.Background = Brushes.Transparent;
+            if (SidebarSearchShortcutHint != null)
+                SidebarSearchShortcutHint.Visibility = Visibility.Collapsed;
+        };
+        SidebarSearchEditor.BeginAnimation(OpacityProperty, opacityAnim);
+        SidebarSearchEditorScale.BeginAnimation(System.Windows.Media.ScaleTransform.ScaleXProperty, new DoubleAnimation(1, 0.85, duration)
+        {
+            EasingFunction = new CubicEase { EasingMode = EasingMode.EaseIn }
+        });
+    }
+}

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -2087,102 +2087,6 @@ public partial class ChatWindow : Window
 
     // ─── 검색 ────────────────────────────────────────────────────────────
 
-    private void SidebarSearchTrigger_MouseEnter(object sender, MouseEventArgs e)
-    {
-        if (SidebarSearchTrigger != null)
-            SidebarSearchTrigger.Background = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.Transparent;
-        if (SidebarSearchShortcutHint != null)
-            SidebarSearchShortcutHint.Visibility = Visibility.Visible;
-    }
-
-    private void SidebarSearchTrigger_MouseLeave(object sender, MouseEventArgs e)
-    {
-        if (SidebarSearchTrigger != null)
-            SidebarSearchTrigger.Background = Brushes.Transparent;
-        if (SidebarSearchShortcutHint != null)
-            SidebarSearchShortcutHint.Visibility = Visibility.Collapsed;
-    }
-
-    private void SidebarSearchTrigger_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
-    {
-        OpenSidebarSearch();
-    }
-
-    private void SidebarNewChatTrigger_MouseEnter(object sender, MouseEventArgs e)
-    {
-        if (SidebarNewChatTrigger != null)
-            SidebarNewChatTrigger.Background = TryFindResource("ItemHoverBackground") as Brush ?? Brushes.Transparent;
-        if (SidebarNewChatShortcutHint != null)
-            SidebarNewChatShortcutHint.Visibility = Visibility.Visible;
-    }
-
-    private void SidebarNewChatTrigger_MouseLeave(object sender, MouseEventArgs e)
-    {
-        if (SidebarNewChatTrigger != null)
-            SidebarNewChatTrigger.Background = Brushes.Transparent;
-        if (SidebarNewChatShortcutHint != null)
-            SidebarNewChatShortcutHint.Visibility = Visibility.Collapsed;
-    }
-
-    private void SidebarNewChatTrigger_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
-    {
-        BtnNewChat_Click(sender, new RoutedEventArgs());
-    }
-
-    private void BtnSidebarSearchClose_Click(object sender, RoutedEventArgs e)
-    {
-        CloseSidebarSearch(clearText: true);
-    }
-
-    private void OpenSidebarSearch()
-    {
-        if (SidebarSearchEditor == null || SidebarSearchTrigger == null || SidebarSearchEditorScale == null)
-            return;
-
-        SidebarSearchTrigger.Visibility = Visibility.Collapsed;
-        SidebarSearchEditor.Visibility = Visibility.Visible;
-        SidebarSearchEditor.Opacity = 0;
-        SidebarSearchEditorScale.ScaleX = 0.85;
-
-        var duration = TimeSpan.FromMilliseconds(160);
-        SidebarSearchEditor.BeginAnimation(OpacityProperty, new DoubleAnimation(0, 1, duration));
-        SidebarSearchEditorScale.BeginAnimation(System.Windows.Media.ScaleTransform.ScaleXProperty, new DoubleAnimation(0.85, 1, duration)
-        {
-            EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
-        });
-
-        Dispatcher.BeginInvoke(new Action(() =>
-        {
-            SearchBox?.Focus();
-            SearchBox?.SelectAll();
-        }), DispatcherPriority.Background);
-    }
-
-    private void CloseSidebarSearch(bool clearText)
-    {
-        if (SidebarSearchEditor == null || SidebarSearchTrigger == null || SidebarSearchEditorScale == null)
-            return;
-
-        if (clearText && SearchBox != null && !string.IsNullOrEmpty(SearchBox.Text))
-            SearchBox.Text = "";
-
-        var duration = TimeSpan.FromMilliseconds(140);
-        var opacityAnim = new DoubleAnimation(1, 0, duration);
-        opacityAnim.Completed += (_, _) =>
-        {
-            SidebarSearchEditor.Visibility = Visibility.Collapsed;
-            SidebarSearchTrigger.Visibility = Visibility.Visible;
-            SidebarSearchTrigger.Background = Brushes.Transparent;
-            if (SidebarSearchShortcutHint != null)
-                SidebarSearchShortcutHint.Visibility = Visibility.Collapsed;
-        };
-        SidebarSearchEditor.BeginAnimation(OpacityProperty, opacityAnim);
-        SidebarSearchEditorScale.BeginAnimation(System.Windows.Media.ScaleTransform.ScaleXProperty, new DoubleAnimation(1, 0.85, duration)
-        {
-            EasingFunction = new CubicEase { EasingMode = EasingMode.EaseIn }
-        });
-    }
-
     private void SearchBox_TextChanged(object sender, TextChangedEventArgs e)
     {
         _conversationSearchTimer.Stop();