Consider adding separators to thread nav buttons (Follow-up from "Fix radii of MR thread nav buttons")
The following discussion from !205942 should be addressed: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/205942#note_2770741129 > Related, this whole control is very similar to a [label button](https://design-gitlab-com-gitlab-org-gitlab-services-f6beaf2fb7fd4cad76.gitlab.io/storybook/?path=/story/base-button--label-button), which has separation between the buttons to clarify the label and the buttons. Trying to adapt that to here, that would be: > > | Label button example | All borders | Border between label and button | > |----------------------|-------------|---------------------------------| > | ![CleanShot 20250923102138@2x.png](/uploads/899f9b307f90d9566a24526ba73c33ac/CleanShot_20250923102138_2x.png) | ![CleanShot 20250923101746@2x.png](/uploads/9c8f202e7f20868efc4cd419b75a3e1c/CleanShot_20250923101746_2x.png) | ![CleanShot 20250923101810@2x.png](/uploads/a43079e2fb4632d1eb317cfb1fc7ea00/CleanShot_20250923101810_2x.png) | > > It's strange that we are not applying this component here, as we do in other places, like the commits views.
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