Apple's  MacBook Neo   budget laptop  has been an early hit . With supplies constrained in April, there's been speculation about what will happen if Apple  runs out of the A18 Pro processor  (which was first introduced to power the iPhone 16 Pro ).  In terms of longevity, the Neo might have an advantage over other portables: It's Apple's most repairable laptop in ages. For several generations, the company's laptops have been designed as sealed vaults that house a processor, memory, storage and other electronics. And when I say "sealed," I mean it: Opening one up often involves using a heat gun to soften stretches of glue and adhesive strips.…