Futures tracking the Nasdaq 100 led Wall Street lower on Thursday after Nvidia shares plunged on reports that its board was weighing the ouster of CEO Jensen Huang, souring sentiment toward AI-linked stocks. Reports of a second extramarital affair involving Nvidia’s longtime leader sent its shares down 7.7% in premarket trading, as investors fretted over the potential fallout from any leadership change at the company central to the AI boom. “The controversy creates an unusually difficult…