feat: update version to 1.4.6 and enhance code block component with download and copy sticky support

src/components/Option/Playground/Playground.tsx

@@ -145,7 +145,7 @@ export const Playground = () => {
           <div className="fixed bottom-36 z-20 left-0 right-0 flex justify-center">
             <button
               onClick={scrollToBottom}
-              className="bg-white border border-gray-100 dark:border-none dark:bg-white/20 p-1.5 rounded-full pointer-events-auto">
+              className="bg-gray-50 shadow border border-gray-200 dark:border-none dark:bg-white/20 p-1.5 rounded-full pointer-events-auto">
               <ChevronDown className="size-4 text-gray-600 dark:text-gray-300" />
             </button>
           </div>