making the buy input box in the swap-form ready only

src/components/swap-form.tsx

@@ -309,6 +309,7 @@ export function SwapForm() {
               onChange={(e) => setToAmount(e.target.value)}
               className="text-2xl h-16"
               disabled={!selectedFromToken}
+              readOnly
             />
             <div className="relative min-w-[160px] space-y-1" ref={toDropdownRef}>
               <Button