Shares of Designer Brands Inc., the parent of the DSW, surged 22 percent Thursday after reporting second-quarter results that topped Wall Street targets with both sales and gross margins improving sequentially versus the first quarter. Doug Howe, CEO, said sales were helped by “increasing strength in our casual offerings,” including a strong launch of Le Tigre footwear, and he remains enthused about the return this month of Nike to DSW’s selling floors.