Melt 2 Tbsp butter; toast panko with lemon zest, Old Bay, salt, and paprika until crisp, 3–4 min.
Melt remaining butter; sauté shallots and garlic 2 min; deglaze with wine 1 min; add corn, crab, and Old Bay—cook 3–5 min; stir in lemon juice.
Cook linguine until al dente, 8–10 min; reserve ½ cup water.
Toss pasta with crab–corn mix and pasta water; top with chopped parsley.
Sprinkle with panko topping and serve with lemon wedges.