Use pnpm and more clean-up of sandbox mode

src/pages/home.tsx

@@ -81,7 +81,7 @@ export default function HomePage() {
     );
   }
 
-  // Main Home Page Content (Rendered only if runtimeMode is set)
+  // Main Home Page Content
   return (
     <div className="flex flex-col items-center justify-center max-w-3xl m-auto p-8">
       <h1 className="text-6xl font-bold mb-12 bg-clip-text text-transparent bg-gradient-to-r from-gray-900 to-gray-600 dark:from-gray-100 dark:to-gray-400 tracking-tight">