Cancelling a club session gives the place back
A cancelled session now comes off the booking entirely. It leaves the parent's clubs and their week at a glance, and the date is bookable again by someone else. The credit and the order still record what happened.
Two related fixes for clubs sold by the session or by weekday: each date can now be booked separately, and a club that has already started stays open for its remaining dates — for parents and for reception booking on their behalf.