Use Fira Math for matplotlib math rendering via custom fontset

[Copilot]

• Diagnose why math isn't rendering: mathjax4_config overwrites Sphinx's default window.MathJax = {options: {processHtmlClass: ...}} needed for math inside mathjax_ignore sections
• Fix: include processHtmlClass in mathjax4_config so the overwrite still contains the required setting
• Verify fix: test build confirms both options now appear in the final window.MathJax assignment
• Pre-commit hooks pass

Summary by Sourcery

Switch documentation math rendering to MathJax with Fira Math and ensure math is correctly processed in Sphinx HTML output.

Enhancements:

• Configure MathJax via sphinx.ext.mathjax and mathjax4_config so Sphinx HTML math is processed even inside mathjax_ignore sections.
• Update Matplotlib style configuration to use the Fira Math font for math rendering in plots.

Build:

• Add Fira Math font download to the Makefile font installation target used for docs builds.

CI:

• Extend the GitHub Pages workflow to download and install the Fira Math font for documentation builds.

Chores:

• Remove the sphinxcontrib-katex dependency from the docs extra and Sphinx configuration.

[sourcery-ai]

Reviewer's Guide

Switches Sphinx math rendering from KaTeX to MathJax with a custom MathJax config to use the Fira Math font and ensure math inside MyST-generated mathjax_ignore sections is still processed, and wires Fira Math into both CI and local doc font installation.

File-Level Changes

Change	Details	Files
Replace KaTeX with Sphinx MathJax and configure MathJax to use Fira Math while preserving Sphinx’s required processHtmlClass so math in mathjax_ignore sections renders correctly.	Swap sphinxcontrib.katex for sphinx.ext.mathjax in the Sphinx extension list. Remove sphinxcontrib-katex from the docs extra dependencies in pyproject.toml. Add a mathjax4_config dictionary that sets options.processHtmlClass to the regex expected by Sphinx and configures output.font to mathjax-fira, with comments explaining the double-assignment behavior of window.MathJax and the MyST mathjax_ignore interaction.	docs/conf.py pyproject.toml
Ensure the Fira Math font is available in both CI and local documentation builds so Matplotlib can render math with the configured font.	Introduce a FIRA_MATH_URL environment variable/Makefile variable pointing to the FiraMath-Regular.otf release asset. Extend the GitHub Pages workflow’s font installation step to download FiraMath-Regular.otf into the temporary font directory before copying into /usr/local/share/fonts/qpdk. Extend the Makefile install-doc-fonts target to download FiraMath-Regular.otf into the temp font directory alongside existing fonts.	.github/workflows/pages.yml Makefile

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[sourcery-ai]

Hey - I've left some high level feedback:

• The Fira Math download URL is duplicated in both the GitHub Actions workflow and the Makefile; consider centralizing this versioned URL in a single place (or deriving one from the other) to avoid drift on future upgrades.
• Since mathjax4_config fully overwrites the earlier window.MathJax assignment, consider explicitly mirroring any other Sphinx defaults you rely on (beyond processHtmlClass) or adding a brief comment noting that additional MathJax options must be kept in sync with Sphinx’ defaults if they change.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The Fira Math download URL is duplicated in both the GitHub Actions workflow and the Makefile; consider centralizing this versioned URL in a single place (or deriving one from the other) to avoid drift on future upgrades.
- Since `mathjax4_config` fully overwrites the earlier `window.MathJax` assignment, consider explicitly mirroring any other Sphinx defaults you rely on (beyond `processHtmlClass`) or adding a brief comment noting that additional MathJax options must be kept in sync with Sphinx’ defaults if they change.

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