Apple’s effort to reinvent the iPad by adding a giant foldable screen has hit development hurdles, potentially delaying the planned launch. The Cupertino, California-based company has been working on the device – projected to cost around US$3,000 – for several years and had most recently aimed for a 2028 release. But engineering challenges tied to weight, features and display technology have pushed its potential debut to 2029 or later, according to people familiar with the matter. Apple is...