Shawarma Spiced Tofu Pita Wraps

Name: Shawarma-Spiced Tofu Pita Wraps
Ingredients: 1/2 small red onion, thinly sliced; 3 Tbsp. seasoned rice vinegar; 1 (14-oz.) block firm or extra-firm tofu, drained; 3 Tbsp. extra-virgin olive oil; 2 tsp. ground coriander; 2 tsp. smoked Spanish paprika; 1/2 tsp. crushed red pepper flakes; 1/2 tsp. ground cinnamon; 1 tsp. kosher salt, plus more; 1/2 cup whole-milk Greek yogurt; 1 small garlic clove, finely grated; 4 pitas, warmed; 2 Persian or mini cucumbers, thinly sliced lengthwise; Mint leaves (for serving)