Xiaomi’s share of China’ssmartphone market isheading in the wrong direction, but a phone as fine as the Mi MIX may change that—and inspire competitors. The stunning handset, designed by Philippe Starck,shuns bezelswith an edge-to-edge display that coversmore than 91 percent of thefront surface area. There’s so much screen that the selfie camera is at the bottom, because there’s simply no room at the top. The display measures 6.