WASHINGTON — The Supreme Court appeared likely Wednesday to leave in place most of a federal law that gives preference to Native American families in foster care and adoption proceedings of Native children.The justices heard more than three hours of arguments in a broad challenge to the Indian Child Welfare Act, enacted in 1978 to address concerns that Native children were being separated from their families and, too frequently, placed in non-Native homes.It has long been championed by tribal leaders as a means of …