fix(ui): context menu operates on right-clicked item and gates new-task on list selection

- Add PointerPressed handlers on list/task item templates that set SelectedList/SelectedTask on right-click before the ContextFlyout opens
- Add CanAddTask guard and NotifyCanExecuteChangedFor on CurrentListId so Add Task menu item is disabled when no list is selected

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

src/ClaudeDo.Ui/ViewModels/TaskListViewModel.cs

@@ -24,7 +24,7 @@ public partial class TaskListViewModel : ViewModelBase
     public ObservableCollection<TaskItemViewModel> Tasks { get; } = new();
 
     [ObservableProperty] private TaskItemViewModel? _selectedTask;
-    [ObservableProperty] private string? _currentListId;
+    [ObservableProperty, NotifyCanExecuteChangedFor(nameof(AddTaskCommand))] private string? _currentListId;
 
     public event Action<TaskItemViewModel?>? SelectedTaskChanged;
 
@@ -69,7 +69,9 @@ public partial class TaskListViewModel : ViewModelBase
         }
     }
 
-    [RelayCommand]
+    private bool CanAddTask() => CurrentListId is not null;
+
+    [RelayCommand(CanExecute = nameof(CanAddTask))]
     private async Task AddTask()
     {
         if (CurrentListId is null) return;

src/ClaudeDo.Ui/Views/MainWindow.axaml

@@ -31,7 +31,7 @@
                          Margin="4">
                     <ListBox.ItemTemplate>
                         <DataTemplate x:DataType="vm:ListItemViewModel">
-                            <StackPanel Margin="4,2" DoubleTapped="OnListItemDoubleTapped">
+                            <StackPanel Margin="4,2" DoubleTapped="OnListItemDoubleTapped" PointerPressed="OnListItemPointerPressed">
                                 <StackPanel.ContextFlyout>
                                     <MenuFlyout>
                                         <MenuItem Header="Edit"

src/ClaudeDo.Ui/Views/MainWindow.axaml.cs

@@ -27,4 +27,14 @@ public partial class MainWindow : Window
             e.Handled = true;
         }
     }
+
+    private void OnListItemPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (e.GetCurrentPoint(null).Properties.PointerUpdateKind == PointerUpdateKind.RightButtonPressed
+            && sender is Control c && c.DataContext is ListItemViewModel item
+            && DataContext is MainWindowViewModel vm)
+        {
+            vm.SelectedList = item;
+        }
+    }
 }

src/ClaudeDo.Ui/Views/TaskListView.axaml

@@ -18,7 +18,7 @@
                  Margin="4">
             <ListBox.ItemTemplate>
                 <DataTemplate x:DataType="vm:TaskItemViewModel">
-                    <Grid ColumnDefinitions="*,Auto,Auto" Margin="4,2" DoubleTapped="OnTaskItemDoubleTapped">
+                    <Grid ColumnDefinitions="*,Auto,Auto" Margin="4,2" DoubleTapped="OnTaskItemDoubleTapped" PointerPressed="OnTaskItemPointerPressed">
                         <Grid.ContextFlyout>
                             <MenuFlyout>
                                 <MenuItem Header="Edit"

src/ClaudeDo.Ui/Views/TaskListView.axaml.cs

@@ -20,4 +20,14 @@ public partial class TaskListView : UserControl
             e.Handled = true;
         }
     }
+
+    private void OnTaskItemPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (e.GetCurrentPoint(null).Properties.PointerUpdateKind == PointerUpdateKind.RightButtonPressed
+            && sender is Control c && c.DataContext is TaskItemViewModel item
+            && DataContext is TaskListViewModel vm)
+        {
+            vm.SelectedTask = item;
+        }
+    }
 }