To much fanfare, Apple announced Tuesday that Angela Ahrendts is resigning as chief executive officer of Burberry and joining the inner circle in Cupertino, California. “Apple-polishing” has become the headline du jour. Picturing the soignée Ahrendts surrounded by geeks in jeans and hoodies, we might be forgiven for wondering why Apple feels in need of a fashionista buff-up. After all, there is hardly a product line more shiny-bright than Apple’s -- or one with less affinity to the cold exclusivity of the world’s great fashion houses.