StepTitle constructor
      const
      StepTitle({ 
    
- Key? key,
- required Widget title,
- Widget? subtitle,
- CrossAxisAlignment crossAxisAlignment = CrossAxisAlignment.stretch,
- VoidCallback? onPressed,
Creates a StepTitle.
The title is required. The subtitle, crossAxisAlignment, and
onPressed parameters are optional.
Parameters:
- title(Widget, required): main title content
- subtitle(Widget?): optional subtitle below title
- crossAxisAlignment(CrossAxisAlignment): text alignment (default: stretch)
- onPressed(VoidCallback?): tap callback for interaction
Example:
StepTitle(
  title: Text('Payment Info'),
  subtitle: Text('Credit card details'),
  crossAxisAlignment: CrossAxisAlignment.center,
  onPressed: () => navigateToPayment(),
);
Implementation
const StepTitle({
  super.key,
  required this.title,
  this.subtitle,
  this.crossAxisAlignment = CrossAxisAlignment.stretch,
  this.onPressed,
});