UI: Viewing files that have only 1 version

[djalilhebal]

In the following screenshot, I opened shuding/nextra/blob/main/docs/pages/_app.mdx which, at the time of writing, has only one version/revision.

The UI looks a bit off when you try to go to the next (right arrow) or previous (left arrow) version.

I expect to not be able to go to a non-existent version or for the UI to revert back to its "normal" state.
Instead, if stays like this (unlike you go back to the correct and only version):