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/TaskRowView.axaml.cs

@@ -48,6 +48,18 @@ public partial class TaskRowView : UserControl
             await vm.ClearScheduleCommand.ExecuteAsync(row);
     }
 
+    private async void OnAddToMyDayClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            await vm.AddToMyDayCommand.ExecuteAsync(row);
+    }
+
+    private async void OnRemoveFromMyDayClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            await vm.RemoveFromMyDayCommand.ExecuteAsync(row);
+    }
+
     private async void OnOpenPlanningSessionClick(object? sender, RoutedEventArgs e)
     {
         if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
@@ -72,10 +84,10 @@ public partial class TaskRowView : UserControl
             await vm.DiscardPlanningSessionCommand.ExecuteAsync(row);
     }
 
-    private async void OnQueuePlanningSubtasksClick(object? sender, RoutedEventArgs e)
+    private async void OnFinalizePlanningSessionClick(object? sender, RoutedEventArgs e)
     {
         if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
-            await vm.QueuePlanningSubtasksCommand.ExecuteAsync(row);
+            await vm.FinalizePlanningSessionCommand.ExecuteAsync(row);
     }
 
     private async void OnSetStatusClick(object? sender, RoutedEventArgs e)