Clearer emails and simpler payment summaries

What changed

• Booking confirmation emails now show the key trip details up front, so you can understand the booking without opening Vally first.
• If an automatic payment fails, the email now includes the customer name and order number so the affected order is easier to identify.
• Email previews in customization now use your real business details instead of placeholder content.
• When the full amount is due right away, cart and order summaries now use simpler wording and no longer show an unnecessary later balance.
• The calendar loading message now stays accurate while your schedule is still loading.