Nike is facing a new class action lawsuit accusing the company of failing to refund tariff-related costs it passed on to consumers through higher prices. In the proposed lawsuit, consumers argue Nike should not be allowed to keep “significant” refunds it may receive after the U.S. Supreme Court ruled in February that the president lacked authority under the International Emergency Economic Powers Act (IEEPA) to impose certain tariffs.Nike has said it paid roughly $1 billion…