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/Views/Islands/NotesEditorView.axaml.cs

@@ -1,8 +1,18 @@
 using Avalonia.Controls;
+using Avalonia.Interactivity;
+using ClaudeDo.Ui.ViewModels.Islands;
 
 namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class NotesEditorView : UserControl
 {
     public NotesEditorView() => InitializeComponent();
+
+    private void OnBulletLostFocus(object? sender, RoutedEventArgs e)
+    {
+        if (sender is TextBox { DataContext: NoteBulletViewModel bullet }
+            && DataContext is NotesEditorViewModel vm
+            && vm.CommitBulletCommand.CanExecute(bullet))
+            vm.CommitBulletCommand.Execute(bullet);
+    }
 }