Grilled Corn and Steak Fattoush

Name: Grilled Corn and Steak Fattoush
Ingredients: 1 7⅓-oz. bag plain pita chips; 2 Tbsp. extra-virgin olive oil; 1 Tbsp. sumac; 2 tsp. granulated sugar; Zest of 1 large lemon; 3 garlic cloves, finely grated; 2 cups cherry tomatoes (about 10 oz.), halved; ½ cup fresh lemon juice; 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more; 1 lb. boneless New York strip steak; 8 Tbsp. extra-virgin olive oil, divided, plus more; Freshly ground black pepper; 3 ears of corn, husked; 1 bunch scallions; 4 Persian cucumbers, halved lengthwise, sliced crosswise on a diagonal ½ thick; 1 bunch red radishes, trimmed, thinly sliced; 2 cups (loosely packed) coarsely chopped mixed tender herbs (such as parsley, dill, and/or mint)