Improve site header account and navigation item styling

The styling of the site header account sign-up button and navigation items has been updated. Class names and transition durations were adjusted for better visualization and usability. The changes particularly enhance the hover effect on the sign-up button and navigation items.

apps/web/app/(marketing)/_components/site-header-account-section.tsx

@@ -79,9 +79,10 @@ function AuthButtons() {
       </div>
 
       <Link href={pathsConfig.auth.signUp}>
-        <Button variant={'default'}>
+        <Button className='group' variant={'default'}>
           <Trans i18nKey={'auth:signUp'} />
-          <ChevronRight className={'h-4'} />
+
+          <ChevronRight className={'h-4 w-4 ml-1 group-hover:translate-x-1 transition-transform duration-500'} />
         </Button>
       </Link>
     </div>