Xiaomi today officially announced the 18 Fold, its first wide-format foldable, at a product event in China, two days before Apple is expected to unveil its own first foldable iPhone. The Xiaomi 18 Fold uses a similar wide-folding design to the Samsung Z Fold8 and Apple's upcoming foldable iPhone. It features a 5.38-inch outer display and a 7.58-inch inner…