New York Post may be compensated and/or receive an affiliate commission if you click or buy through our links. Featured pricing is subject to change. Sneakers and ballet flats dominated last summer, so obviously, trendsetters decided to marry the two. Part pointe shoe, part playground trainer, the hybrid is pirouetting straight into every too-cool-for-school closet. Meet the “sneakerina,” or what Bad Bunny labeled the “Ballerina,” from his recent adidas collab — an instant bestselling hit…