Disneyland's first Snow White--subject of a nationwide search--has been found living happily ever after in Newport Beach. "I didn't realize Disney was looking for me," said JoAnn Killingsworth, 63, a divorcee who works part time at a department store, plays golf and recently started taking tap-dancing lessons. "If I had, I would have called somebody and said, 'Here I am. Here's Snow White.' " When Disneyland opened July 17, 1955, Killingsworth--then 31 and a dancer on television variety shows--rode a float in the parade dressed in the flouncy white skirts of Snow White and accompanied by the dwarfs. Disney has invited about 80 former Snow Whites to its parks in Anaheim, Florida and Tokyo to celebrate the 50th anniversary of "Snow White," the company's first full-length animated feature.