Switch documentation theme to Furo

[mtap-research]

Summary

• replace PyData Sphinx Theme with Furo 2025.12.19
• preserve the existing Sphinx, autodoc, sphinx-design, and Read the Docs workflow
• add branded light and dark color palettes
• provide keyboard navigation and GitHub view/edit links
• adapt custom landing-page styles to Furo selectors

Validation

• sphinx-build -W --keep-going -b html docs/source /tmp/coremof-furo-html
• all 11 documentation pages, module indices, search index, and source views built successfully with no warnings

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 6df04291dd

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Apply custom dark styles in Furo's auto mode

Furo normally leaves body[data-theme="auto"] in place and applies the OS dark preference through a media query, so these rules only run after a user explicitly selects dark mode. With the default automatic theme on a dark-preferring system, fixed light styles such as the checklist's background: #fff remain while Furo supplies dark foreground colors, and navy headings/sidebar branding stay on a dark background. Include the automatic dark-mode media-query case or derive these colors from Furo's theme variables.

Useful? React with 👍 / 👎.