ToplineShares of Google parent Alphabet tumbled Wednesday after its key partner Apple indicated Google’s days of search engine dominance on Apple devices may be numbered, causing Google stock to limp toward one of its largest losses ever, the latest test for the company as generative artificial intelligence reshapes users’ search habits.Google paid Apple $20 billion in 2022 in its search engine arrangement. SOPA Images/LightRocket via Getty ImagesKey FactsEddy Cue, the senior vice president of Apple’s servi ...