All is well with the car. In the heat of battle, I'd completely forgotten that the others were already on their way home and that we could jump-start it, totally avoiding the AAA. Which we did. I'm so glad I'd decided to wait to call them.
Also, completely unbeknownst to me, Nathan has an older charging unit here that, in a pinch, can do the job. It has to be plugged in, but we mostly want it for around the house anyway. But I think we'll still want to get the BK one. Those are great units, in addition to being portable.
And yes, we know of two (count 'em) other people, all with different kinds of cars, who have had this happen from an interior light being on. Those things will run it down.