Score ultra-cushy flats, sneakers, and loafersCredit: James Devaney/GC Images; Oprah/Instagram; BackgridThere’s never been a better time to own a pair of Vivaia shoes. Earlier this year, the American Podiatric Medical Association, or APMA, gave its official seal of approval to a handful of styles from the brand worn by Oprah, Julia Roberts, and my very fashionable colleagues. What does this mean, exactly? In addition to looking super cute, Vivai…