Once upon a time, slippers were reserved for the hours spent indoors before and after work. But for the masses working from home this year, dress codes have been transformed — business casual, who? — including footwear. Farewell, heels; hello, fuzzy slides. Cloudlike open-toed shoes have become a cozy quarantine staple. “They kind of cover all those grounds and are good for wearing in the house, but also you can run out in them and be fine,” said Beth Goldstein, executive dir