Shares of NIO Inc. bounced into positive territory Thursday, again, to buck weakness in rival China-based electric vehicle makers, after J.P. Morgan analyst Nick YC Lai suggested they may be “bottoming out.” The stock was down as much as 2.8% earlier before reversing to rise 0.7% in morning trading, while XPeng Inc.’s stock shed 3.2% toward a record low and Li Auto Inc. shares slid 3.4%. On Wednesday, after NIO reported a wider-than-expected second-quarter loss and provided a downbeat third-quar