style(ui): subtasks, notes, details metadata footer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -66,6 +66,12 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
 
     private CancellationTokenSource? _loadCts;
 
+    // Set by shell so CloseDetailCommand can clear SelectedTask
+    public Action? CloseDetail { get; set; }
+
+    // Set by shell so DeleteTaskCommand can remove from list
+    public Func<TaskRowViewModel, System.Threading.Tasks.Task>? DeleteFromList { get; set; }
+
     // Set by the view so OpenDiffCommand can show the modal as a dialog
     public Func<DiffModalViewModel, System.Threading.Tasks.Task>? ShowDiffModal { get; set; }
 
@@ -198,6 +204,34 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         await System.Threading.Tasks.Task.CompletedTask;
     }
 
+    [RelayCommand]
+    private void CloseDetails() => CloseDetail?.Invoke();
+
+    [RelayCommand]
+    private async System.Threading.Tasks.Task DeleteTaskAsync()
+    {
+        if (Task == null) return;
+        var row = Task;
+        await using var ctx = _dbFactory.CreateDbContext();
+        var repo = new TaskRepository(ctx);
+        await repo.DeleteAsync(row.Id);
+        if (DeleteFromList != null)
+            await DeleteFromList(row);
+        CloseDetail?.Invoke();
+    }
+
+    [RelayCommand]
+    private async System.Threading.Tasks.Task SaveNotesAsync()
+    {
+        if (Task == null) return;
+        await using var ctx = _dbFactory.CreateDbContext();
+        var repo = new TaskRepository(ctx);
+        var entity = await repo.GetByIdAsync(Task.Id);
+        if (entity == null) return;
+        entity.Notes = Notes;
+        await repo.UpdateAsync(entity);
+    }
+
     [RelayCommand]
     private async System.Threading.Tasks.Task ApproveMergeAsync()
     {

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

@@ -22,6 +22,9 @@ public sealed partial class TaskRowViewModel : ViewModelBase
     [ObservableProperty] private int _diffAdditions;
     [ObservableProperty] private int _diffDeletions;
 
+    public DateTime CreatedAt { get; init; }
+    public string CreatedAtFormatted => CreatedAt == default ? "—" : $"Created {CreatedAt:MMM d}";
+
     public IReadOnlyList<string> Tags { get; init; } = Array.Empty<string>();
     public int StepsCount { get; init; }
     public int StepsCompleted { get; init; }
@@ -78,6 +81,7 @@ public sealed partial class TaskRowViewModel : ViewModelBase
             ScheduledFor  = t.ScheduledFor,
             DiffAdditions = add,
             DiffDeletions = del,
+            CreatedAt     = t.CreatedAt,
         };
     }