feat(ui): show task number in Mission Control activity strip

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs

@@ -151,7 +151,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
                             : t.Status == ClaudeDo.Data.Models.TaskStatus.WaitingForReview ? 1
                             : t.Status == ClaudeDo.Data.Models.TaskStatus.Running ? 2 : 3)
                 .ThenBy(t => t.SortOrder).ThenBy(t => t.CreatedAt)
-                .Select(t => new { t.Id, t.Title, t.BlockedByTaskId, t.Status, t.RoadblockCount })
+                .Select(t => new { t.Id, t.Number, t.Title, t.BlockedByTaskId, t.Status, t.RoadblockCount })
                 .ToListAsync();
 
             Queued.Clear();
@@ -163,6 +163,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
                 Queued.Add(new QueuedTaskViewModel
                 {
                     Id = id,
+                    Number = r.Number,
                     Title = r.Title ?? string.Empty,
                     IsRunning = running,
                     TintKey = tint,
@@ -802,6 +803,9 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
 public sealed class QueuedTaskViewModel
 {
     public required string Id { get; init; }
+    /// <summary>Task number (#N); 0 for rows created outside <c>TaskNumberAllocator</c>.</summary>
+    public int Number { get; init; }
+    public bool ShowNumber => Number > 0;
     public required string Title { get; init; }
     public bool IsRunning { get; init; }
     /// <summary>Brush key of the row tint (e.g. "RunningTint"); null = untinted.</summary>