THESE PRECIOUS DAYSAt the center of These Precious Days is the title essay, a surprising and moving meditation on an unexpected friendship that explores ''what it means to be seen, to find someone with whom you can be your best and most complete self.'' When Patchett chose an early galley of actor and producer Tom Hanks' short story collection to read one night before bed, she had no idea that this single choice would be life changing. It would introduce her to a