feat(ui): add Let Claude handle it broom button to tasks header

src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs

@@ -72,6 +72,12 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
     [ObservableProperty] private string _completedHeader = "";
     [ObservableProperty] private bool _showNotesRow;
     [ObservableProperty] private bool _isMyDayList;
+    [ObservableProperty] private bool _isLetClaudeVisible;
+
+    public event EventHandler? LetClaudeHandleRequested;
+
+    [RelayCommand]
+    private void LetClaudeHandle() => LetClaudeHandleRequested?.Invoke(this, EventArgs.Empty);
 
     internal Task? LoadTask { get; private set; }
 
@@ -211,8 +217,11 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
 
     private void OnCurrentListPropertyChanged(object? sender, System.ComponentModel.PropertyChangedEventArgs e)
     {
-        if (e.PropertyName == nameof(ListNavItemViewModel.Name) && sender is ListNavItemViewModel vm)
+        if (sender is not ListNavItemViewModel vm) return;
+        if (e.PropertyName == nameof(ListNavItemViewModel.Name))
             HeaderTitle = vm.Name;
+        else if (e.PropertyName == nameof(ListNavItemViewModel.WorkingDir))
+            IsLetClaudeVisible = vm.Kind == ListKind.User && !string.IsNullOrWhiteSpace(vm.WorkingDir);
     }
 
     public void LoadForList(ListNavItemViewModel? list)
@@ -237,12 +246,13 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         HasCompleted  = false;
         ShowOpenLabel = false;
         ShowNotesRow  = false;
-        if (list is null) { LoadTask = Task.CompletedTask; return; }
+        if (list is null) { IsLetClaudeVisible = false; LoadTask = Task.CompletedTask; return; }
 
         HeaderTitle = list.Name;
         HeaderEyebrow = DateTime.Now.ToString("dddd · MMM dd", CultureInfo.InvariantCulture).ToUpperInvariant();
         ShowNotesRow = list.Id == "smart:my-day";
         IsMyDayList  = list.Id == "smart:my-day";
+        IsLetClaudeVisible = list.Kind == ListKind.User && !string.IsNullOrWhiteSpace(list.WorkingDir);
 
         LoadTask = LoadForListAsync(list, ct);
     }