feat(ui): add copy-last-40-lines button to log visualizer

src/ClaudeDo.Ui/ViewModels/Modals/LogVisualizerViewModel.cs

@@ -3,6 +3,9 @@ using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
 using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Input.Platform;
 using ClaudeDo.Data.Models;
 using ClaudeDo.Ui.Localization;
 using ClaudeDo.Ui.Services;
@@ -18,7 +21,10 @@ namespace ClaudeDo.Ui.ViewModels.Modals;
 /// </summary>
 public sealed partial class LogVisualizerViewModel : ViewModelBase
 {
+    private const int CopyLastCount = 40;
+
     private readonly IWorkerClient _worker;
+    private readonly Func<string, Task<bool>> _copyToClipboard;
     private IReadOnlyList<WorkerLogEntry> _all = Array.Empty<WorkerLogEntry>();
 
     public ObservableCollection<LogVisualizerRow> Rows { get; } = new();
@@ -28,7 +34,14 @@ public sealed partial class LogVisualizerViewModel : ViewModelBase
 
     public Action? CloseAction { get; set; }
 
-    public LogVisualizerViewModel(IWorkerClient worker) => _worker = worker;
+    public LogVisualizerViewModel(IWorkerClient worker) : this(worker, CopyToClipboardAsync) { }
+
+    internal LogVisualizerViewModel(IWorkerClient worker, Func<string, Task<bool>> copyToClipboard)
+    {
+        _worker = worker;
+        _copyToClipboard = copyToClipboard;
+        Rows.CollectionChanged += (_, _) => CopyLastCommand.NotifyCanExecuteChanged();
+    }
 
     [RelayCommand]
     public async Task RefreshAsync()
@@ -53,6 +66,33 @@ public sealed partial class LogVisualizerViewModel : ViewModelBase
     }
 
     [RelayCommand] private void Close() => CloseAction?.Invoke();
+
+    private bool CanCopyLast() => Rows.Count > 0;
+
+    [RelayCommand(CanExecute = nameof(CanCopyLast))]
+    private async Task CopyLastAsync()
+    {
+        var count = Math.Min(Rows.Count, CopyLastCount);
+        var ok = await _copyToClipboard(BuildCopyText());
+        StatusText = ok
+            ? Loc.T("modals.logVisualizer.copied", count)
+            : Loc.T("modals.logVisualizer.copyFailed");
+    }
+
+    internal string BuildCopyText() =>
+        string.Join('\n', Rows.Take(CopyLastCount).Reverse()
+            .Select(r => $"{r.Time}  {r.Level.ToString().ToUpperInvariant()}  {r.Message}"));
+
+    private static async Task<bool> CopyToClipboardAsync(string text)
+    {
+        if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop &&
+            desktop.MainWindow?.Clipboard is { } clipboard)
+        {
+            try { await clipboard.SetTextAsync(text); return true; }
+            catch { return false; }
+        }
+        return false;
+    }
 }
 
 public sealed record LogVisualizerRow(string Time, string Message, WorkerLogLevel Level);