David Eggers died on Monday, at age 45, probably of a heart attack. In 1986, Eggers was a white-hot 16-year-old world tour rookie destined for a mantelpiece-full of world title trophies. Eighteen months later he was off the tour, living with his folks, cradling a freebase pipe and tearing up the streets of La Jolla. “Yesterday was gone,” Eggers later said,…