refactor(header): streamline mobile layout for improved readability

- Simplified the mobile layout by consolidating the class names for the hidden div.
- Enhanced code readability and maintainability in the Header component.

Author: ssshojaei

src/layouts/partials/Header.tsx

@@ -131,10 +131,7 @@ const Header: React.FC = () => {
                 <Logo size="header" />
               </div>
               {/* Mirror menu width so wordmark sits on true center (mobile only) */}
-              <div
-                className="w-12 shrink-0 lg:hidden"
-                aria-hidden="true"
-              />
+              <div className="w-12 shrink-0 lg:hidden" aria-hidden="true" />
             </>
           ) : (
             <div className="flex items-center">