If there’s any doubt about how seriously Meta is taking AI, here’s a new signal: The company on Wednesday announced that its Muse assistant is now available in a dedicated iPad app. That’s a milestone it took Instagram some 15 years to reach, despite constant user demand. Muse, meanwhile, hit the iPad just a month after launching on iPhone. (To be fair, it may not be as difficult to bring something like Muse to iPad, given its text-heavy interface, where image and video resolution and formatting matter less.) Since launching on iOS and Android on September 8, Muse has topped 6.6 million…