The first week of the Denny Blaine Park trial has concluded, and it was spent on neighbors and their lawyers making the case that the nude beach is an out-of-control public nuisance. The trial is existential for a legendary, decades-old queer hangout. If neighbors get their way, the city could be forced to ban nudity at the beach or even close it. Understanding what is going on here requires a preamble: The trial is really the culmination of a y…