Support table of contents button for org-mode file previews

skkzshrequested to merge
gitlab-community/gitlab-org/gitlab:skkzsh/org-toc into master

What does this MR do and why?

Closes #600361 (closed).

org-ruby doesn't generate heading anchors, so this MR introduces Banzai::Filter::MarkupHeadingAnchorFilter to inject them into rendered HTML.

Screenshots

Visually confirmed rendering on GDK-in-a-box.

org-toc

Notes

  • No docs updates included – this area isn't well covered by existing documentation. If there are specific docs that should be updated, please flag them.
  • Backend engineer, but fairly new to Rails – feedback on Rails conventions welcome.

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