The fast-casual salad company has gotten crushed this year. Is there hope for a turnaround?The stock market continues to set new records and artificial intelligence (AI) stocks are booming for the third year in a row, but Sweetgreen (SG +0.32%) has been headed in the opposite direction this year.Shares of the fast-casual salad slinger are now down 77% as seemingly everything is going wrong for the brand.After a year of solid growth in 2024, Sweetgreen's comparable sales have turned negative through the firs ...