Cameron Mcloughlin 6d20698eef mermaid: The other half of #57967 (#58419) ...

I was a silly goose didn't notice my `git push` failed, so merged #57967
without a critical commit, and some follow-ups.

This PR just cherry-picks those commits.

Release Notes:

- N/A or Added/Fixed/Improved ...

2026-06-03 14:10:43 +00:00

..

src

mermaid: The other half of #57967 (#58419)

2026-06-03 14:10:43 +00:00

tests

markdown: Merman (#57644)

2026-05-27 16:27:18 +00:00

Cargo.toml

mermaid: The other half of #57967 (#58419)

2026-06-03 14:10:43 +00:00

LICENSE-GPL

markdown: Merman (#57644)

2026-05-27 16:27:18 +00:00