SetupBuilder class

A convenience widget that uses a builder function for setup.

This is the simplest way to use SetupWidget without creating a custom class.

Example:

SetupBuilder(
  setup: (context) {
    final count = useSignal(0);

    return (context) => Column(
      children: [
        Text('Count: ${count.value}'),
        ElevatedButton(
          onPressed: () => count.value++,
          child: Text('Increment'),
        ),
      ],
    );
  },
)