Apple debuted a new Series 9 Watch with a more powerful processor on Tuesday ahead of an expected announcement about the iPhone 15 with new charging ports and better cameras – and possibly higher prices for top models. CEO Tim Cook also said Apple is “on track” to ship its Vision Pro mixed-reality headset early next year. The event at Apple’s Cupertino, Calif., headquarters comes amid a global smartphone slump and lingering economic uncertainty, especially in China, Apple’s third-largest market where it faces challenges from expanded restrictions on using its iPhones in government offices and the first new flagship phone…