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

README.md

@@ -1191,3 +1191,6 @@ MIT License
 - 업데이트: 2026-04-06 10:56 (KST)
   - 대화 목록 관리 interaction을 [ChatWindow.ConversationManagementPresentation.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.ConversationManagementPresentation.cs) 로 분리했다. 제목 인라인 편집 `EnterTitleEditMode(...)` 와 대화 메뉴 `ShowConversationMenu(...)`가 메인 [ChatWindow.xaml.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.xaml.cs) 밖으로 이동해, 고정/이름 변경/카테고리 변경/삭제 같은 목록 관리 UI 책임도 별도 presentation surface에서 다루게 정리했다.
   - 이 단계까지 완료된 구조 개선은 상태선/권한/도구 결과 카탈로그화, inline ask/plan 분리, footer/Git/preset/list/message/timeline 분리, 그리고 conversation management 분리까지다. 이제 남은 건 큰 구조 개선이 아니라 개별 surface polish와 후속 UX 고도화 수준이다.
+- 업데이트: 2026-04-06 11:03 (KST)
+  - 좌측 sidebar의 검색/새 대화 interaction을 [ChatWindow.SidebarInteractionPresentation.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.SidebarInteractionPresentation.cs) 로 분리했다. 검색 트리거 hover, 새 대화 hover, 검색 열기/닫기 애니메이션이 메인 [ChatWindow.xaml.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.xaml.cs) 밖으로 이동해, 메인 창은 runtime/transcript orchestration에 더 집중하고 sidebar UX는 별도 presentation surface에서 다루게 정리했다.
+  - 큰 구조 개선 계획 기준으로는 이제 sidebar interaction까지 분리 완료 상태이며, 이후 남는 작업은 공통 시각 언어 polish나 실제 사용 흐름 기반 미세 UX 튜닝 같은 후속 개선 영역이다.

docs/DEVELOPMENT.md

@@ -4931,3 +4931,5 @@ ow + toggle ?쒓컖 ?몄뼱濡??ㅼ떆 ?뺣젹?덈떎.
 - Document update: 2026-04-06 10:44 (KST) - This consolidates timeline-related helpers in one place and leaves the main chat window file with less transcript-specific rendering logic around `RenderMessages()`.
 - Document update: 2026-04-06 10:56 (KST) - Split conversation-management interactions out of `ChatWindow.xaml.cs` into `ChatWindow.ConversationManagementPresentation.cs`. Inline title editing and the conversation action popup (pin/unpin, rename, category change, delete) now live in a dedicated presentation partial.
 - Document update: 2026-04-06 10:56 (KST) - With this pass, the remaining large structure-improvement track is effectively complete; follow-up work is now mostly UX polish and surface-level tuning rather than further decomposition of the main chat window orchestration file.
+- Document update: 2026-04-06 11:03 (KST) - Split sidebar search/new-chat interactions out of `ChatWindow.xaml.cs` into `ChatWindow.SidebarInteractionPresentation.cs`. Hover state changes, sidebar search open/close transitions, and new-chat trigger behavior now live in a dedicated presentation partial.
+- Document update: 2026-04-06 11:03 (KST) - This leaves the main chat window even more orchestration-focused and effectively closes the last obvious sidebar interaction block from the large structure-improvement plan. Remaining work is now follow-up UX polish rather than major decomposition.

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();