close abstract method

Programmatically dismisses the toast notification.

Triggers the dismissal animation and removes the toast from the display stack. This method can be called multiple times safely - subsequent calls after dismissal will have no effect.

Example:

final toast = showToast(context: context, builder: (context, overlay) {
  return AlertCard(
    title: 'Auto-close',
    trailing: IconButton(
      icon: Icon(Icons.close),
      onPressed: overlay.close,
    ),
  );
});

// Close programmatically after delay
Timer(Duration(seconds: 2), toast.close);