Function run_wizard_loop 

pub async fn run_wizard_loop<B: Backend>(
    wizard: &mut Wizard,
    terminal: &mut Terminal<B>,
    events: &mut impl EventSource,
    tick_rate: Duration,
) -> Result<Option<SetupPlan>>

The wizard’s draw/input loop.

Generic over the backend and event source so it runs against a TestBackend and canned keys; the real crossterm bindings live in the binary. Returns the plan to apply, or None if the user quit.