feat(ui): add queueing and scheduling from task row context menu

- Right-click on a task row exposes Send to queue / Remove from queue
  and Schedule for... / Clear schedule actions.
- New virtual:queued list in the sidebar with live count.
- Sidebar counts are now computed (open per list, running, queued,
  review) and refreshed on task- and worker-side events.
- Sending a task to the queue wakes the worker so it starts immediately.

src/ClaudeDo.Ui/Views/Islands/TaskRowView.axaml.cs

@@ -1,16 +1,72 @@
+using System.Linq;
 using Avalonia;
 using Avalonia.Animation;
 using Avalonia.Animation.Easings;
 using Avalonia.Controls;
+using Avalonia.Interactivity;
 using Avalonia.Media;
 using Avalonia.Styling;
+using Avalonia.VisualTree;
+using ClaudeDo.Ui.ViewModels.Islands;
 
 namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class TaskRowView : UserControl
 {
+    private TaskRowViewModel? _pendingScheduleRow;
+
     public TaskRowView() { InitializeComponent(); }
 
+    private TasksIslandViewModel? FindTasksVm() =>
+        this.GetVisualAncestors().OfType<ItemsControl>()
+            .Select(ic => ic.DataContext).OfType<TasksIslandViewModel>().FirstOrDefault();
+
+    private async void OnSendToQueueClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            await vm.SendToQueueCommand.ExecuteAsync(row);
+    }
+
+    private async void OnRemoveFromQueueClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            await vm.RemoveFromQueueCommand.ExecuteAsync(row);
+    }
+
+    private async void OnClearScheduleClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            await vm.ClearScheduleCommand.ExecuteAsync(row);
+    }
+
+    private void OnScheduleForClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is not TaskRowViewModel row) return;
+        _pendingScheduleRow = row;
+        var seed = row.ScheduledFor ?? DateTime.Now.AddHours(1);
+        ScheduleDate.SelectedDate = new DateTimeOffset(seed.Date, TimeSpan.Zero);
+        ScheduleTime.SelectedTime = seed.TimeOfDay;
+        ScheduleAnchor.Flyout?.ShowAt(ScheduleAnchor);
+    }
+
+    private async void OnScheduleSetClick(object? sender, RoutedEventArgs e)
+    {
+        ScheduleAnchor.Flyout?.Hide();
+        if (_pendingScheduleRow is null || ScheduleDate.SelectedDate is null) return;
+        var date = ScheduleDate.SelectedDate.Value.Date;
+        var time = ScheduleTime.SelectedTime ?? TimeSpan.FromHours(9);
+        var when = date + time;
+        if (FindTasksVm() is { } tvm)
+            await tvm.SetScheduledForAsync(_pendingScheduleRow, when);
+        _pendingScheduleRow = null;
+    }
+
+    private void OnScheduleCancelClick(object? sender, RoutedEventArgs e)
+    {
+        ScheduleAnchor.Flyout?.Hide();
+        _pendingScheduleRow = null;
+    }
+
     protected override async void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
     {
         base.OnAttachedToVisualTree(e);