AX Agent 파일 브라우저 렌더 구조 분리 및 문서 갱신

- ChatWindow.FileBrowserPresentation.cs를 추가해 파일 탐색기 열기/닫기, 폴더 트리 구성, 파일 헤더·아이콘·크기 표시, 우클릭 메뉴, 디바운스 새로고침 흐름을 메인 창 코드에서 분리함

- ChatWindow.xaml.cs는 transcript·runtime orchestration 중심으로 더 정리해 claw-code 기준 sidebar/file surface 품질 개선을 이어가기 쉬운 구조로 개선함

- README.md와 docs/DEVELOPMENT.md에 2026-04-06 08:55 (KST) 기준 변경 이력을 반영함

- dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\ 기준 경고 0 / 오류 0 확인

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -15827,342 +15827,6 @@ public partial class ChatWindow : Window
         hideTimer.Start();
     }
 
-    // ─── 파일 탐색기 ──────────────────────────────────────────────────────
-
-    private static readonly HashSet<string> _ignoredDirs = new(StringComparer.OrdinalIgnoreCase)
-    {
-        "bin", "obj", "node_modules", ".git", ".vs", ".idea", ".vscode",
-        "__pycache__", ".mypy_cache", ".pytest_cache", "dist", "build",
-        ".cache", ".next", ".nuxt", "coverage", ".terraform",
-    };
-
-    private DispatcherTimer? _fileBrowserRefreshTimer;
-
-    private void ToggleFileBrowser()
-    {
-        if (FileBrowserPanel.Visibility == Visibility.Visible)
-        {
-            FileBrowserPanel.Visibility = Visibility.Collapsed;
-            _settings.Settings.Llm.ShowFileBrowser = false;
-        }
-        else
-        {
-            FileBrowserPanel.Visibility = Visibility.Visible;
-            _settings.Settings.Llm.ShowFileBrowser = true;
-            BuildFileTree();
-        }
-        _settings.Save();
-    }
-
-    private void BtnFileBrowserRefresh_Click(object sender, RoutedEventArgs e) => BuildFileTree();
-
-    private void BtnFileBrowserOpenFolder_Click(object sender, RoutedEventArgs e)
-    {
-        var folder = GetCurrentWorkFolder();
-        if (string.IsNullOrEmpty(folder) || !System.IO.Directory.Exists(folder)) return;
-        try { System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo { FileName = folder, UseShellExecute = true }); } catch { }
-    }
-
-    private void BtnFileBrowserClose_Click(object sender, RoutedEventArgs e)
-    {
-        FileBrowserPanel.Visibility = Visibility.Collapsed;
-    }
-
-    private void BuildFileTree()
-    {
-        FileTreeView.Items.Clear();
-        var folder = GetCurrentWorkFolder();
-        if (string.IsNullOrEmpty(folder) || !System.IO.Directory.Exists(folder))
-        {
-            FileTreeView.Items.Add(new TreeViewItem { Header = "작업 폴더를 선택하세요", IsEnabled = false });
-            return;
-        }
-
-        FileBrowserTitle.Text = $"파일 탐색기 — {System.IO.Path.GetFileName(folder)}";
-        var count = 0;
-        PopulateDirectory(new System.IO.DirectoryInfo(folder), FileTreeView.Items, 0, ref count);
-    }
-
-    private void PopulateDirectory(System.IO.DirectoryInfo dir, ItemCollection items, int depth, ref int count)
-    {
-        if (depth > 4 || count > 200) return;
-
-        // 디렉터리
-        try
-        {
-            foreach (var subDir in dir.GetDirectories().OrderBy(d => d.Name))
-            {
-                if (count > 200) break;
-                if (_ignoredDirs.Contains(subDir.Name) || subDir.Name.StartsWith('.')) continue;
-
-                count++;
-                var dirItem = new TreeViewItem
-                {
-                    Header = CreateFileTreeHeader("\uED25", subDir.Name, null),
-                    Tag = subDir.FullName,
-                    IsExpanded = depth < 1,
-                };
-
-                // 지연 로딩: 더미 자식 → 펼칠 때 실제 로드
-                if (depth < 3)
-                {
-                    dirItem.Items.Add(new TreeViewItem { Header = "로딩 중..." }); // 더미
-                    var capturedDir = subDir;
-                    var capturedDepth = depth;
-                    dirItem.Expanded += (s, _) =>
-                    {
-                        if (s is TreeViewItem ti && ti.Items.Count == 1 && ti.Items[0] is TreeViewItem d && d.Header?.ToString() == "로딩 중...")
-                        {
-                            ti.Items.Clear();
-                            int c = 0;
-                            PopulateDirectory(capturedDir, ti.Items, capturedDepth + 1, ref c);
-                        }
-                    };
-                }
-                else
-                {
-                    PopulateDirectory(subDir, dirItem.Items, depth + 1, ref count);
-                }
-
-                items.Add(dirItem);
-            }
-        }
-        catch { }
-
-        // 파일
-        try
-        {
-            foreach (var file in dir.GetFiles().OrderBy(f => f.Name))
-            {
-                if (count > 200) break;
-                count++;
-
-                var ext = file.Extension.ToLowerInvariant();
-                var icon = GetFileIcon(ext);
-                var size = FormatFileSize(file.Length);
-
-                var fileItem = new TreeViewItem
-                {
-                    Header = CreateFileTreeHeader(icon, file.Name, size),
-                    Tag = file.FullName,
-                };
-
-                // 더블클릭 → 프리뷰
-                var capturedPath = file.FullName;
-                fileItem.MouseDoubleClick += (s, e) =>
-                {
-                    e.Handled = true;
-                    TryShowPreview(capturedPath);
-                };
-
-                // 우클릭 → 컨텍스트 메뉴 (MouseRightButtonUp에서 열어야 Popup이 바로 닫히지 않음)
-                fileItem.MouseRightButtonUp += (s, e) =>
-                {
-                    e.Handled = true;
-                    if (s is TreeViewItem ti) ti.IsSelected = true;
-                    ShowFileTreeContextMenu(capturedPath);
-                };
-
-                items.Add(fileItem);
-            }
-        }
-        catch { }
-    }
-
-    private static StackPanel CreateFileTreeHeader(string icon, string name, string? sizeText)
-    {
-        var sp = new StackPanel { Orientation = Orientation.Horizontal };
-        sp.Children.Add(new TextBlock
-        {
-            Text = icon,
-            FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 11,
-            Foreground = new SolidColorBrush(Color.FromRgb(0x9C, 0xA3, 0xAF)),
-            VerticalAlignment = VerticalAlignment.Center,
-            Margin = new Thickness(0, 0, 5, 0),
-        });
-        sp.Children.Add(new TextBlock
-        {
-            Text = name,
-            FontSize = 11.5,
-            VerticalAlignment = VerticalAlignment.Center,
-        });
-        if (sizeText != null)
-        {
-            sp.Children.Add(new TextBlock
-            {
-                Text = $"  {sizeText}",
-                FontSize = 10,
-                Foreground = new SolidColorBrush(Color.FromRgb(0x6B, 0x72, 0x80)),
-                VerticalAlignment = VerticalAlignment.Center,
-            });
-        }
-        return sp;
-    }
-
-    private static string GetFileIcon(string ext) => ext switch
-    {
-        ".html" or ".htm" => "\uEB41",
-        ".xlsx" or ".xls" => "\uE9F9",
-        ".docx" or ".doc" => "\uE8A5",
-        ".pdf" => "\uEA90",
-        ".csv" => "\uE80A",
-        ".md" => "\uE70B",
-        ".json" or ".xml" => "\uE943",
-        ".png" or ".jpg" or ".jpeg" or ".gif" or ".svg" or ".webp" => "\uEB9F",
-        ".cs" or ".py" or ".js" or ".ts" or ".java" or ".cpp" => "\uE943",
-        ".bat" or ".cmd" or ".ps1" or ".sh" => "\uE756",
-        ".txt" or ".log" => "\uE8A5",
-        _ => "\uE7C3",
-    };
-
-    private static string FormatFileSize(long bytes) => bytes switch
-    {
-        < 1024 => $"{bytes} B",
-        < 1024 * 1024 => $"{bytes / 1024.0:F1} KB",
-        _ => $"{bytes / (1024.0 * 1024.0):F1} MB",
-    };
-
-    private void ShowFileTreeContextMenu(string filePath)
-    {
-        var bg = TryFindResource("LauncherBackground") as Brush ?? new SolidColorBrush(Color.FromRgb(0x1E, 0x1E, 0x2E));
-        var borderBrush = TryFindResource("BorderColor") as Brush ?? Brushes.Gray;
-        var primaryText = TryFindResource("PrimaryText") as Brush ?? Brushes.White;
-        var secondaryText = TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
-        var hoverBg = TryFindResource("HintBackground") as Brush ?? new SolidColorBrush(Color.FromArgb(0x18, 0xFF, 0xFF, 0xFF));
-        var dangerBrush = new SolidColorBrush(Color.FromRgb(0xE7, 0x4C, 0x3C));
-
-        var popup = new Popup
-        {
-            StaysOpen = false, AllowsTransparency = true, PopupAnimation = PopupAnimation.Fade,
-            Placement = PlacementMode.MousePoint,
-        };
-        var panel = new StackPanel { Margin = new Thickness(2) };
-        var container = new Border
-        {
-            Background = bg, BorderBrush = borderBrush, BorderThickness = new Thickness(1),
-            CornerRadius = new CornerRadius(10), Padding = new Thickness(6), MinWidth = 200,
-            Effect = new System.Windows.Media.Effects.DropShadowEffect
-            {
-                BlurRadius = 16, ShadowDepth = 4, Opacity = 0.3,
-                Color = Colors.Black, Direction = 270,
-            },
-            Child = panel,
-        };
-        popup.Child = container;
-
-        void AddItem(string icon, string label, Action action, Brush? labelColor = null, Brush? iconColor = null)
-        {
-            var sp = new StackPanel { Orientation = Orientation.Horizontal };
-            sp.Children.Add(new TextBlock
-            {
-                Text = icon, FontFamily = new FontFamily("Segoe MDL2 Assets"),
-                FontSize = 13, Foreground = iconColor ?? secondaryText,
-                VerticalAlignment = VerticalAlignment.Center, Margin = new Thickness(0, 0, 10, 0),
-            });
-            sp.Children.Add(new TextBlock
-            {
-                Text = label, FontSize = 12.5, Foreground = labelColor ?? primaryText,
-                VerticalAlignment = VerticalAlignment.Center,
-            });
-            var item = new Border
-            {
-                Child = sp, Background = Brushes.Transparent,
-                CornerRadius = new CornerRadius(7), Cursor = Cursors.Hand,
-                Padding = new Thickness(10, 8, 14, 8), Margin = new Thickness(0, 1, 0, 1),
-            };
-            item.MouseEnter += (s, _) => { if (s is Border b) b.Background = hoverBg; };
-            item.MouseLeave += (s, _) => { if (s is Border b) b.Background = Brushes.Transparent; };
-            item.MouseLeftButtonUp += (_, _) => { popup.IsOpen = false; action(); };
-            panel.Children.Add(item);
-        }
-
-        void AddSep()
-        {
-            panel.Children.Add(new Border
-            {
-                Height = 1, Margin = new Thickness(10, 4, 10, 4),
-                Background = borderBrush, Opacity = 0.3,
-            });
-        }
-
-        var ext = System.IO.Path.GetExtension(filePath).ToLowerInvariant();
-        if (_previewableExtensions.Contains(ext))
-            AddItem("\uE8A1", "미리보기", () => ShowPreviewPanel(filePath));
-
-        AddItem("\uE8A7", "외부 프로그램으로 열기", () =>
-        {
-            try { System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo { FileName = filePath, UseShellExecute = true }); } catch { }
-        });
-        AddItem("\uED25", "폴더에서 보기", () =>
-        {
-            try { System.Diagnostics.Process.Start("explorer.exe", $"/select,\"{filePath}\""); } catch { }
-        });
-        AddItem("\uE8C8", "경로 복사", () =>
-        {
-            try { Clipboard.SetText(filePath); ShowToast("경로 복사됨"); } catch { }
-        });
-
-        AddSep();
-
-        // 이름 변경
-        AddItem("\uE8AC", "이름 변경", () =>
-        {
-            var dir = System.IO.Path.GetDirectoryName(filePath) ?? "";
-            var oldName = System.IO.Path.GetFileName(filePath);
-            var dlg = new Views.InputDialog("이름 변경", "새 파일 이름:", oldName) { Owner = this };
-            if (dlg.ShowDialog() == true && !string.IsNullOrWhiteSpace(dlg.ResponseText))
-            {
-                var newPath = System.IO.Path.Combine(dir, dlg.ResponseText.Trim());
-                try
-                {
-                    System.IO.File.Move(filePath, newPath);
-                    BuildFileTree();
-                    ShowToast($"이름 변경: {dlg.ResponseText.Trim()}");
-                }
-                catch (Exception ex) { ShowToast($"이름 변경 실패: {ex.Message}", "\uE783"); }
-            }
-        });
-
-        // 삭제
-        AddItem("\uE74D", "삭제", () =>
-        {
-            var result = CustomMessageBox.Show(
-                $"파일을 삭제하시겠습니까?\n{System.IO.Path.GetFileName(filePath)}",
-                "파일 삭제 확인", MessageBoxButton.YesNo, MessageBoxImage.Warning);
-            if (result == MessageBoxResult.Yes)
-            {
-                try
-                {
-                    System.IO.File.Delete(filePath);
-                    BuildFileTree();
-                    ShowToast("파일 삭제됨");
-                }
-                catch (Exception ex) { ShowToast($"삭제 실패: {ex.Message}", "\uE783"); }
-            }
-        }, dangerBrush, dangerBrush);
-
-        // Dispatcher로 열어야 MouseRightButtonUp 후 바로 닫히지 않음
-        Dispatcher.BeginInvoke(() => { popup.IsOpen = true; },
-            System.Windows.Threading.DispatcherPriority.Input);
-    }
-
-    /// <summary>에이전트가 파일 생성 시 파일 탐색기를 자동 새로고침합니다.</summary>
-    private void RefreshFileTreeIfVisible()
-    {
-        if (FileBrowserPanel.Visibility != Visibility.Visible) return;
-
-        // 디바운스: 500ms 내 중복 호출 방지
-        _fileBrowserRefreshTimer?.Stop();
-        _fileBrowserRefreshTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(500) };
-        _fileBrowserRefreshTimer.Tick += (_, _) =>
-        {
-            _fileBrowserRefreshTimer.Stop();
-            BuildFileTree();
-        };
-        _fileBrowserRefreshTimer.Start();
-    }
-
     // ─── 하단 상태바 ──────────────────────────────────────────────────────
 
     private void BtnCompactNow_Click(object sender, RoutedEventArgs e)