This commit attempts to fix most of regressions caused by #12961
pull request which added even spread of space between tabs.

The following fixes were done:

- Don't hide overflow in tabs

   As tabs use ::after and ::before pseudo-elements to create arrow on
   the bottom of selected tab, "overflow: hidden" will cause this arrow
   to look split from the bottom container.

   For the future we probably should use slider element instead, which
   would align according to currently selected tab, instead of relying
   on pseudo-elements. Such method would also allow smooth transitions.

- Disallow wrapping tab text on insufficient space

   This would fix some unwanted behavior[1] when on insufficient width,
   renderer might attempt wrapping text to not overtake others' space.

   [1]: https://mastodon.social/@Gargron/103546083813829165