feat: Add HTML preview to code blocks

Adds an HTML preview feature to the code block component, allowing users to view the rendered output of their HTML code snippets. This improves the user experience by providing a more interactive and informative way to understand the code.

src/components/Option/Playground/PlaygroundChat.tsx

@@ -61,7 +61,7 @@ export const PlaygroundChat = () => {
         )}
       </div>
       {!isAtBottom && (
-        <div className="fixed md:bottom-44 bottom-36 z-[9999999] left-0 right-0 flex justify-center">
+        <div className="fixed md:bottom-44 bottom-36 z-[99999] left-0 right-0 flex justify-center">
           <button
             onClick={scrollToBottom}
             className="bg-gray-100 dark:bg-gray-800 p-1 rounded-full shadow-md hover:bg-gray-200 dark:hover:bg-gray-700 transition-colors duration-200">