CAVA Group (NYSE:CAVA) is facing the prospect of its first decline in same-restaurant sales after a period of strong comparable sales growth. The potential downturn in comparable sales comes as the company introduces its first seafood menu item and accelerates new store openings. This shift in sales trends arrives after CAVA Group's early track record of positive store-level performance since going public. For investors watching NYSE:CAVA, the same-restaurant sales trend is front and center...