feat(tasks): mark tasks and lists as manual

Reminders written down as todos had no home: every task looked like Claude work.
A manual task now shows a MANUAL badge and hides send-to-queue, refine and the
planning session; the queue picker, daily prep and the list handler all skip it,
with a TaskStateService guard so the MCP surface and hub cannot start one either.
Opening a hand-driven ConPTY session stays available on purpose.

A list can be marked manual in its settings, which makes tasks created there
(UI and MCP add_task) start out manual. Toggle per task from its context menu.

src/ClaudeDo.Ui/Views/Islands/TaskRowView.axaml.cs

@@ -43,6 +43,12 @@ public partial class TaskRowView : UserControl
             await vm.ClearScheduleCommand.ExecuteAsync(row);
     }
 
+    private async void OnToggleManualClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            await vm.ToggleManualCommand.ExecuteAsync(row);
+    }
+
     private async void OnAddToMyDayClick(object? sender, RoutedEventArgs e)
     {
         if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)