Samsung Electronics on Wednesday unveiled two foldable smartphones as it continues to bet on devices with bending screens, a budding market that has yet to fully take off because of high prices. The clamshell-designed Galaxy Z Flip 5 and Galaxy Z Fold 5, a larger device that opens and folds like a book, will be available for pre-orders starting Wednesday in certain markets including the United States and South Korea. Built with 6.7-inch and 7.6-inch main screens, the phones have bigger displays than Samsung’s previous folding devices and are equipped with more advanced cameras, providing crisper visuals and more features…