Previously, when an unauthenticated user clicked the "Console" navigation
link, the application would first attempt to navigate to '/console'.
This would then trigger a redirect to '/login', causing a brief flicker
between the two pages.
This commit modifies the `renderNavLinks` function in `HeaderBar.js`
to proactively check the user's authentication status. If the user is
not logged in and clicks the "Console" link, the navigation target
is directly set to '/login', avoiding the intermediate redirect and
eliminating the flickering effect.
a726818c17