Robin Williams was everywhere in San Francisco, it seemed, as he made a place for himself in the everyday fabric of a city where he once said he passed for normal. The comedian was there to usher a few fellow inhabitants of the Bay Area into life—visiting a pediatric ward, unheralded, each year on Christmas Day to welcome newborns to the world. He also ushered friends out of life—delivering a boisterous eulogy for an iconic local journalist known as Mr. San Francisco, musing on heaven as a nice bar in the city with a dry martini. …