Monthly billing terms are clearer from signup to cancellation

All venue tiers are offered with monthly billing. The standard cancellation
window is the remainder of the calendar month in which notice is given, plus
one full calendar month. Billing now shows that rule plainly and calculates the
exact final service date before confirming a cancellation. Service and venue
access remain available through that date.

Paid-tier signup also offers a choice of zero to six free months. Choosing a
free period commits the venue to the same number of paid monthly periods after
the free period; choosing zero adds no promotional commitment. The normal
cancellation window still applies in both cases. The selected terms and monthly
price are shown before the card step and remain visible in Billing afterwards.

Cancellation can be withdrawn before the final service date. If that date
shortens a normal billing period, the final period is prorated so the venue is
not charged for service after it ends.