Investors shouldn't get their hopes up for the Mediterranean fast-casual restaurant's shares to quickly climb back to 52-week highs.Cava (CAVA -0.97%) is doing what you want from an early-stage national brand. It's adding units at a healthy pace, posting solid restaurant-level margins, and building awareness in markets where Mediterranean fast-casual wasn't previously top of mind. That combination has fueled impressive returns for shareholders since its initial public offering (IPO) in the summer of 2023.Bu ...