Parse and apply hotel cancellation penalty windows from the Expedia Rapid cancel_penalties object to drive real-time refund decisions

Verified steps

1. During the shopping response, extract the cancel_penalties array from each rate option; each entry contains start (ISO 8601 datetime), end (ISO 8601 datetime), penalty_type (e.g., NIGHTS, AMOUNT, PERCENT), and value.
2. Convert the start and end timestamps to the property's local time using the property_timezone field in the rate response — cancellation deadlines are enforced in property local time, not the customer's timezone.
3. At cancellation request time, compare the current UTC timestamp to the penalty window boundaries; if the current time is before the first penalty window's start, the cancellation is penalty-free.
4. If within a penalty window, compute the penalty amount: NIGHTS type multiplies by the nightly rate, PERCENT type multiplies by the total stay cost, and AMOUNT type is a fixed charge; surface this to the user before confirming cancellation.
5. Display the cancellation policy in the booking confirmation using human-readable rendering of the penalty windows: 'Free cancellation until [local date/time at property]; after that, a [X] night penalty applies.'
6. After cancellation, store the penalty_amount charged and refund_amount returned from the cancel API response; these override the pre-calculated estimate if the property has applied a different rate at time of cancellation.