Restore main into develop's lineage

PR #458 was merged to both branches, so main's 7e8432b and develop's cc1974d
carry the same change under different commits. The content is already here - the
banner PNG is byte-identical on both sides and the render-pptx hero card is on
develop - but main was no longer an ancestor, and the post-release fast-forward
of main would have been rejected at the next cut.

Recorded with -s ours because develop's tree is already correct and has moved
past main; this merge exists to restore ancestry, not to carry content.

Author: DemchaAV