fix(tui): keep nested list indentation in rendered markdown - #7030

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Some commits are missing Signed-off-by — amend with git commit --amend -s