Sweetgreen (SG) late Wednesday joined Cava (CAVA) with disappointing earnings and light guidance. But Sweetgreen stock reversed higher off multimonth lows on Thursday while Cava stock extended its losing streak to a seventh day. Late Wednesday, Sweetgreen delivered a larger-than-feared loss for the fourth quarter. Late Tuesday, Cava missed lofty Q4 earnings expectations. Cava Earnings And Outlook For Q4, Cava…