User is not set correctly on the first rendering

When the user is signed in, if I refresh the page, `user` is not set correctly for the first rendering. So, if we render the `` component when the user is signed in and `` component otherwise, then `` will be rendered momentarily and only then the page will be re-rendered to display `SignedIn`. See also [my question on StackOverflow](https://stackoverflow.com/questions/68407958/firebase-user-is-not-set-on-the-first-rendering).