feat(ui): My Day actions, orphan-aware grouping, menu restructure

Pending UI work:
- My Day add/remove context actions on task rows (parent removal cascades to children)
- orphan-aware grouping: a child whose parent isn't in view renders as a top-level row, not an indented draft
- shell menu restructure (Worker / Repositories submenus); 'Finalize plan' action, drop 'Queue subtasks sequentially'
- notes editor refinements
- subtask-row hover tweak (Surface3, no transition)
- bump Avalonia 12.0.0 -> 12.0.4

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

@@ -7,24 +7,15 @@ namespace ClaudeDo.Ui.ViewModels.Islands;
 
 public sealed partial class NoteBulletViewModel : ViewModelBase
 {
-    private readonly Func<NoteBulletViewModel, Task> _save;
-    private readonly Func<NoteBulletViewModel, Task> _delete;
-
     public string Id { get; }
 
     [ObservableProperty] private string _text;
 
-    public NoteBulletViewModel(string id, string text,
-        Func<NoteBulletViewModel, Task> save, Func<NoteBulletViewModel, Task> delete)
+    public NoteBulletViewModel(string id, string text)
     {
         Id = id;
         _text = text;
-        _save = save;
-        _delete = delete;
     }
-
-    [RelayCommand] private Task Save() => _save(this);
-    [RelayCommand] private Task Delete() => _delete(this);
 }
 
 public sealed partial class NotesEditorViewModel : ViewModelBase
@@ -57,7 +48,7 @@ public sealed partial class NotesEditorViewModel : ViewModelBase
     }
 
     private NoteBulletViewModel MakeBullet(string id, string text) =>
-        new(id, text, SaveBulletAsync, DeleteBulletAsync);
+        new(id, text);
 
     [RelayCommand]
     private async Task AddBullet()
@@ -73,11 +64,17 @@ public sealed partial class NotesEditorViewModel : ViewModelBase
     [RelayCommand] private Task NextDay() => LoadDayAsync(CurrentDay.AddDays(1));
     [RelayCommand] private Task Today() => LoadDayAsync(DateOnly.FromDateTime(DateTime.Today));
 
-    private Task SaveBulletAsync(NoteBulletViewModel b) => _api.UpdateAsync(b.Id, b.Text);
-
-    private async Task DeleteBulletAsync(NoteBulletViewModel b)
+    [RelayCommand]
+    private async Task CommitBullet(NoteBulletViewModel? b)
     {
-        await _api.DeleteAsync(b.Id);
-        Bullets.Remove(b);
+        if (b is null) return;
+        var text = b.Text?.Trim() ?? "";
+        if (text.Length == 0)
+        {
+            await _api.DeleteAsync(b.Id);
+            Bullets.Remove(b);
+            return;
+        }
+        await _api.UpdateAsync(b.Id, text);
     }
 }