Each recorded payment row (PaymentStep + DetailsStep) now shows the payment
date+time (paid_at, Jalali via formatDateTime, falling back to created_at) and
the user who recorded it (created_by_name) beneath the method/amount line. Both
fields were already in the API payload. Add created_at to SessionPaymentEntry.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>