Single Product Auto-Selection in Builder Preview

🛠️ What Was the Issue?
In the builder preview, if only one product was added to a form, it wasn’t automatically selected causing confusion during checkout.
✅ What’s Fixed
If there’s only one product, it will now be auto-selected for both payment and order summary. No manual selection needed.
🔍 Key Fixes & Improvements
Auto-Selection:
 Single product is selected by default.
Simplified Checkout:
 Users skip the extra step of choosing what's already obvious.
Applies to All Types:
 Works with both radio and checkbox product options.