Improve the visibility of menu options for easier navigation

Update header.tsx to increase font size and weight for menu links.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: e4277a6e-587a-496e-8663-733446748f62
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/af8dabca-e746-4e53-9c29-d8d4d9cf30f5/f0cd1000-4f0b-4f22-af98-624b6322f4f2.jpg

client/src/components/navigation/header.tsx

@@ -63,7 +63,7 @@ export default function Header() {
                     <SheetClose asChild key={link.path}>
                       <Link 
                         href={link.path}
-                        className={`block px-3 py-2 text-base font-medium text-white hover:text-white hover:text-opacity-80`}
+                        className={`block px-4 py-4 text-xl font-bold text-white hover:text-white hover:text-opacity-80`}
                       >
                         {link.name}
                       </Link>