AX Agent timeline 프레젠테이션 helper를 한 파일로 모아 렌더 책임을 더 줄인다

CreateTimelineLoadMoreCard, ToAgentEvent, IsCompactionMetaMessage, CreateCompactionMetaCard를 ChatWindow.TimelinePresentation.cs로 이동해 RenderMessages 주변의 timeline 관련 helper를 하나의 presentation surface로 정리했다.

README와 DEVELOPMENT 문서에 2026-04-06 10:44 (KST) 기준 이력을 반영했고, dotnet build 검증 결과 경고 0 / 오류 0을 확인했다.

README.md

@@ -1186,3 +1186,5 @@ MIT License
   - transcript 메시지 row 조립을 [ChatWindow.MessageBubblePresentation.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.MessageBubblePresentation.cs) 로 분리했다. `AddMessageBubble(...)`가 메인 [ChatWindow.xaml.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.xaml.cs) 밖으로 이동해, 사용자/assistant bubble, 분기 컨텍스트 카드, 액션 바와 메타 row 조립이 별도 presentation surface에서 관리되게 정리했다.
 - 업데이트: 2026-04-06 10:36 (KST)
   - timeline 조립 helper를 [ChatWindow.TimelinePresentation.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.TimelinePresentation.cs) 로 분리했다. `RenderMessages()`가 직접 처리하던 visible 메시지 필터링, execution event 노출 집계, timestamp/order 기반 timeline action 조립을 helper 메서드로 옮겨 메인 렌더 루프를 더 단순화했다.
+- 업데이트: 2026-04-06 10:44 (KST)
+  - timeline presentation 정리를 이어서 진행했다. [ChatWindow.TimelinePresentation.cs](/E:/AX%20Copilot%20-%20Codex/src/AxCopilot/Views/ChatWindow.TimelinePresentation.cs) 에 `CreateTimelineLoadMoreCard`, `ToAgentEvent`, `IsCompactionMetaMessage`, `CreateCompactionMetaCard`까지 옮겨 `RenderMessages()` 주변의 timeline helper를 한 파일로 모았다.

docs/DEVELOPMENT.md

@@ -4927,3 +4927,5 @@ ow + toggle ?쒓컖 ?몄뼱濡??ㅼ떆 ?뺣젹?덈떎.
 - Document update: 2026-04-06 10:27 (KST) - This keeps the main chat window more orchestration-focused while making transcript row rendering easier to tune and extend independently.
 - Document update: 2026-04-06 10:36 (KST) - Split timeline visibility filtering and render-action assembly out of `RenderMessages()` into `ChatWindow.TimelinePresentation.cs`. Visible message/event selection and timestamp-ordered timeline action construction now live in dedicated helpers.
 - Document update: 2026-04-06 10:36 (KST) - This keeps `RenderMessages()` closer to a simple orchestration loop and reduces mixed responsibilities inside the main chat window file.
+- Document update: 2026-04-06 10:44 (KST) - Continued timeline presentation cleanup by moving `CreateTimelineLoadMoreCard`, `ToAgentEvent`, `IsCompactionMetaMessage`, and `CreateCompactionMetaCard` into `ChatWindow.TimelinePresentation.cs`.
+- 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()`.

src/AxCopilot/Views/ChatWindow.TimelinePresentation.cs

@@ -1,7 +1,11 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
 using AxCopilot.Models;
+using AxCopilot.Services.Agent;
 
 namespace AxCopilot.Views;
 
@@ -49,4 +53,182 @@ public partial class ChatWindow
             .ThenBy(x => x.Order)
             .ToList();
     }
+
+    private Border CreateTimelineLoadMoreCard(int hiddenCount)
+    {
+        var hoverBg = TryFindResource("ItemHoverBackground") as Brush ?? BrushFromHex("#F8FAFC");
+        var borderBrush = TryFindResource("BorderColor") as Brush ?? BrushFromHex("#E2E8F0");
+        var primaryText = TryFindResource("PrimaryText") as Brush ?? BrushFromHex("#334155");
+        var secondaryText = TryFindResource("SecondaryText") as Brush ?? BrushFromHex("#64748B");
+
+        var loadMoreBtn = new Button
+        {
+            Background = Brushes.Transparent,
+            BorderBrush = borderBrush,
+            BorderThickness = new Thickness(1),
+            Padding = new Thickness(7, 3, 7, 3),
+            Cursor = System.Windows.Input.Cursors.Hand,
+            Foreground = primaryText,
+            HorizontalAlignment = HorizontalAlignment.Center,
+        };
+        loadMoreBtn.Template = BuildMinimalIconButtonTemplate();
+        loadMoreBtn.Content = new StackPanel
+        {
+            Orientation = Orientation.Horizontal,
+            Children =
+            {
+                new TextBlock
+                {
+                    Text = "\uE70D",
+                    FontFamily = new FontFamily("Segoe MDL2 Assets"),
+                    FontSize = 8,
+                    Foreground = secondaryText,
+                    Margin = new Thickness(0, 0, 4, 0),
+                    VerticalAlignment = VerticalAlignment.Center,
+                },
+                new TextBlock
+                {
+                    Text = $"이전 대화 {hiddenCount:N0}개",
+                    FontSize = 9.25,
+                    Foreground = secondaryText,
+                    VerticalAlignment = VerticalAlignment.Center,
+                }
+            }
+        };
+        loadMoreBtn.MouseEnter += (_, _) => loadMoreBtn.Background = hoverBg;
+        loadMoreBtn.MouseLeave += (_, _) => loadMoreBtn.Background = Brushes.Transparent;
+        loadMoreBtn.Click += (_, _) =>
+        {
+            _timelineRenderLimit += TimelineRenderPageSize;
+            RenderMessages(preserveViewport: true);
+        };
+
+        return new Border
+        {
+            CornerRadius = new CornerRadius(10),
+            Margin = new Thickness(0, 2, 0, 8),
+            Padding = new Thickness(0),
+            Background = Brushes.Transparent,
+            BorderBrush = Brushes.Transparent,
+            BorderThickness = new Thickness(0),
+            HorizontalAlignment = HorizontalAlignment.Center,
+            Child = loadMoreBtn,
+        };
+    }
+
+    private static AgentEvent ToAgentEvent(ChatExecutionEvent executionEvent)
+    {
+        var parsedType = Enum.TryParse<AgentEventType>(executionEvent.Type, out var eventType)
+            ? eventType
+            : AgentEventType.Thinking;
+
+        return new AgentEvent
+        {
+            Timestamp = executionEvent.Timestamp,
+            RunId = executionEvent.RunId,
+            Type = parsedType,
+            ToolName = executionEvent.ToolName,
+            Summary = executionEvent.Summary,
+            FilePath = executionEvent.FilePath,
+            Success = executionEvent.Success,
+            StepCurrent = executionEvent.StepCurrent,
+            StepTotal = executionEvent.StepTotal,
+            Steps = executionEvent.Steps,
+            ElapsedMs = executionEvent.ElapsedMs,
+            InputTokens = executionEvent.InputTokens,
+            OutputTokens = executionEvent.OutputTokens,
+        };
+    }
+
+    private static bool IsCompactionMetaMessage(ChatMessage? message)
+    {
+        var kind = message?.MetaKind ?? "";
+        return kind.Equals("microcompact_boundary", StringComparison.OrdinalIgnoreCase)
+               || kind.Equals("session_memory_compaction", StringComparison.OrdinalIgnoreCase)
+               || kind.Equals("collapsed_boundary", StringComparison.OrdinalIgnoreCase);
+    }
+
+    private Border CreateCompactionMetaCard(ChatMessage message, Brush primaryText, Brush secondaryText, Brush hintBg, Brush borderBrush, Brush accentBrush)
+    {
+        var icon = "\uE9CE";
+        var title = message.MetaKind switch
+        {
+            "session_memory_compaction" => "세션 메모리 압축",
+            "collapsed_boundary" => "압축 경계 병합",
+            _ => "Microcompact 경계",
+        };
+
+        var wrapper = new Border
+        {
+            Background = hintBg,
+            BorderBrush = borderBrush,
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(12),
+            Padding = new Thickness(12, 10, 12, 10),
+            Margin = new Thickness(10, 4, 150, 4),
+            MaxWidth = GetMessageMaxWidth(),
+            HorizontalAlignment = HorizontalAlignment.Left,
+        };
+
+        var stack = new StackPanel();
+        var header = new StackPanel
+        {
+            Orientation = Orientation.Horizontal,
+            Margin = new Thickness(0, 0, 0, 6),
+        };
+        header.Children.Add(new TextBlock
+        {
+            Text = icon,
+            FontFamily = new FontFamily("Segoe MDL2 Assets"),
+            FontSize = 11,
+            Foreground = accentBrush,
+            VerticalAlignment = VerticalAlignment.Center,
+        });
+        header.Children.Add(new TextBlock
+        {
+            Text = title,
+            FontSize = 11,
+            FontWeight = FontWeights.SemiBold,
+            Foreground = primaryText,
+            Margin = new Thickness(6, 0, 0, 0),
+            VerticalAlignment = VerticalAlignment.Center,
+        });
+        stack.Children.Add(header);
+
+        var lines = (message.Content ?? "")
+            .Replace("\r\n", "\n")
+            .Split('\n', StringSplitOptions.RemoveEmptyEntries)
+            .Select(line => line.Trim())
+            .Where(line => !string.IsNullOrWhiteSpace(line))
+            .ToList();
+
+        foreach (var line in lines)
+        {
+            var isHeaderLine = line.StartsWith("[", StringComparison.Ordinal);
+            stack.Children.Add(new TextBlock
+            {
+                Text = isHeaderLine ? line.Trim('[', ']') : line,
+                FontSize = 10.5,
+                FontWeight = isHeaderLine ? FontWeights.SemiBold : FontWeights.Normal,
+                Foreground = isHeaderLine ? primaryText : secondaryText,
+                TextWrapping = TextWrapping.Wrap,
+                Margin = isHeaderLine ? new Thickness(0, 0, 0, 3) : new Thickness(0, 0, 0, 2),
+            });
+        }
+
+        if (!string.IsNullOrWhiteSpace(message.MetaRunId))
+        {
+            stack.Children.Add(new TextBlock
+            {
+                Text = $"run {message.MetaRunId}",
+                FontSize = 9.5,
+                Foreground = secondaryText,
+                Opacity = 0.7,
+                Margin = new Thickness(0, 6, 0, 0),
+            });
+        }
+
+        wrapper.Child = stack;
+        return wrapper;
+    }
 }

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -2770,184 +2770,6 @@ public partial class ChatWindow : Window
         }, DispatcherPriority.Background);
     }
 
-    private Border CreateTimelineLoadMoreCard(int hiddenCount)
-    {
-        var hoverBg = TryFindResource("ItemHoverBackground") as Brush ?? BrushFromHex("#F8FAFC");
-        var borderBrush = TryFindResource("BorderColor") as Brush ?? BrushFromHex("#E2E8F0");
-        var primaryText = TryFindResource("PrimaryText") as Brush ?? BrushFromHex("#334155");
-        var secondaryText = TryFindResource("SecondaryText") as Brush ?? BrushFromHex("#64748B");
-
-        var loadMoreBtn = new Button
-        {
-            Background = Brushes.Transparent,
-            BorderBrush = borderBrush,
-            BorderThickness = new Thickness(1),
-            Padding = new Thickness(7, 3, 7, 3),
-            Cursor = System.Windows.Input.Cursors.Hand,
-            Foreground = primaryText,
-            HorizontalAlignment = HorizontalAlignment.Center,
-        };
-        loadMoreBtn.Template = BuildMinimalIconButtonTemplate();
-        loadMoreBtn.Content = new StackPanel
-        {
-            Orientation = Orientation.Horizontal,
-            Children =
-            {
-                new TextBlock
-                {
-                    Text = "\uE70D",
-                    FontFamily = new FontFamily("Segoe MDL2 Assets"),
-                    FontSize = 8,
-                    Foreground = secondaryText,
-                    Margin = new Thickness(0, 0, 4, 0),
-                    VerticalAlignment = VerticalAlignment.Center,
-                },
-                new TextBlock
-                {
-                    Text = $"이전 대화 {hiddenCount:N0}개",
-                    FontSize = 9.25,
-                    Foreground = secondaryText,
-                    VerticalAlignment = VerticalAlignment.Center,
-                }
-            }
-        };
-        loadMoreBtn.MouseEnter += (_, _) => loadMoreBtn.Background = hoverBg;
-        loadMoreBtn.MouseLeave += (_, _) => loadMoreBtn.Background = Brushes.Transparent;
-        loadMoreBtn.Click += (_, _) =>
-        {
-            _timelineRenderLimit += TimelineRenderPageSize;
-            RenderMessages(preserveViewport: true);
-        };
-
-        return new Border
-        {
-            CornerRadius = new CornerRadius(10),
-            Margin = new Thickness(0, 2, 0, 8),
-            Padding = new Thickness(0),
-            Background = Brushes.Transparent,
-            BorderBrush = Brushes.Transparent,
-            BorderThickness = new Thickness(0),
-            HorizontalAlignment = HorizontalAlignment.Center,
-            Child = loadMoreBtn,
-        };
-    }
-
-    private static AgentEvent ToAgentEvent(ChatExecutionEvent executionEvent)
-    {
-        var parsedType = Enum.TryParse<AgentEventType>(executionEvent.Type, out var eventType)
-            ? eventType
-            : AgentEventType.Thinking;
-
-        return new AgentEvent
-        {
-            Timestamp = executionEvent.Timestamp,
-            RunId = executionEvent.RunId,
-            Type = parsedType,
-            ToolName = executionEvent.ToolName,
-            Summary = executionEvent.Summary,
-            FilePath = executionEvent.FilePath,
-            Success = executionEvent.Success,
-            StepCurrent = executionEvent.StepCurrent,
-            StepTotal = executionEvent.StepTotal,
-            Steps = executionEvent.Steps,
-            ElapsedMs = executionEvent.ElapsedMs,
-            InputTokens = executionEvent.InputTokens,
-            OutputTokens = executionEvent.OutputTokens,
-        };
-    }
-
-    private static bool IsCompactionMetaMessage(ChatMessage? message)
-    {
-        var kind = message?.MetaKind ?? "";
-        return kind.Equals("microcompact_boundary", StringComparison.OrdinalIgnoreCase)
-               || kind.Equals("session_memory_compaction", StringComparison.OrdinalIgnoreCase)
-               || kind.Equals("collapsed_boundary", StringComparison.OrdinalIgnoreCase);
-    }
-
-    private Border CreateCompactionMetaCard(ChatMessage message, Brush primaryText, Brush secondaryText, Brush hintBg, Brush borderBrush, Brush accentBrush)
-    {
-        var icon = "\uE9CE";
-        var title = message.MetaKind switch
-        {
-            "session_memory_compaction" => "세션 메모리 압축",
-            "collapsed_boundary" => "압축 경계 병합",
-            _ => "Microcompact 경계",
-        };
-
-        var wrapper = new Border
-        {
-            Background = hintBg,
-            BorderBrush = borderBrush,
-            BorderThickness = new Thickness(1),
-            CornerRadius = new CornerRadius(12),
-            Padding = new Thickness(12, 10, 12, 10),
-            Margin = new Thickness(10, 4, 150, 4),
-            MaxWidth = GetMessageMaxWidth(),
-            HorizontalAlignment = HorizontalAlignment.Left,
-        };
-
-        var stack = new StackPanel();
-        var header = new StackPanel
-        {
-            Orientation = Orientation.Horizontal,
-            Margin = new Thickness(0, 0, 0, 6),
-        };
-        header.Children.Add(new TextBlock
-        {
-            Text = icon,
-            FontFamily = new FontFamily("Segoe MDL2 Assets"),
-            FontSize = 11,
-            Foreground = accentBrush,
-            VerticalAlignment = VerticalAlignment.Center,
-        });
-        header.Children.Add(new TextBlock
-        {
-            Text = title,
-            FontSize = 11,
-            FontWeight = FontWeights.SemiBold,
-            Foreground = primaryText,
-            Margin = new Thickness(6, 0, 0, 0),
-            VerticalAlignment = VerticalAlignment.Center,
-        });
-        stack.Children.Add(header);
-
-        var lines = (message.Content ?? "")
-            .Replace("\r\n", "\n")
-            .Split('\n', StringSplitOptions.RemoveEmptyEntries)
-            .Select(line => line.Trim())
-            .Where(line => !string.IsNullOrWhiteSpace(line))
-            .ToList();
-
-        foreach (var line in lines)
-        {
-            var isHeaderLine = line.StartsWith("[", StringComparison.Ordinal);
-            stack.Children.Add(new TextBlock
-            {
-                Text = isHeaderLine ? line.Trim('[', ']') : line,
-                FontSize = isHeaderLine ? 10.5 : 10.5,
-                FontWeight = isHeaderLine ? FontWeights.SemiBold : FontWeights.Normal,
-                Foreground = isHeaderLine ? primaryText : secondaryText,
-                TextWrapping = TextWrapping.Wrap,
-                Margin = isHeaderLine ? new Thickness(0, 0, 0, 3) : new Thickness(0, 0, 0, 2),
-            });
-        }
-
-        if (!string.IsNullOrWhiteSpace(message.MetaRunId))
-        {
-            stack.Children.Add(new TextBlock
-            {
-                Text = $"run {message.MetaRunId}",
-                FontSize = 9.5,
-                Foreground = secondaryText,
-                Opacity = 0.7,
-                Margin = new Thickness(0, 6, 0, 0),
-            });
-        }
-
-        wrapper.Child = stack;
-        return wrapper;
-    }
-
     // ─── 커스텀 체크 아이콘 (모든 팝업 메뉴 공통) ─────────────────────────
 
     /// <summary>커스텀 체크/미선택 아이콘을 생성합니다. Path 도형 기반, 선택 시 스케일 바운스 애니메이션.</summary>