[max-models]

• maxplotlib.web.write_posters(fig, stem, **hints) writes <stem>.png and <stem>.dark.png, pictures of a web figure for light and dark pages, with a test.
  • The docs theme's PlotlyFigure shows them (poster, posterDark, PlotlyFigure: calmer figures in the site's colours, caption and poster starlight-theme#64) until plotly.js has drawn the figure, and in its place without JavaScript.
  • They are drawn as the theme draws the figure: transparent, the theme's text and grid colours, its data palette for traces in a default colour, black as the text colour, and no buttons or slider.
  • Uses kaleido, which joins the docs extra.
  • plasma-plots will call it for its posters.
• The "Web figures" guide:
  • captions and posters for the three examples;
  • the heatmap example is smooth (zsmooth="best", with a note to keep the cells for grid data);
  • a short section on captions and posters.
  • scripts/web_figure_examples.py writes the posters, and skips them, with a message, when kaleido can't run.

Checks:

• The tests and the pre-commit hooks pass, and starlight-check-mdx compiles all 22 MDX files.
• I looked at the guide in the dev server with the theme change installed: with JavaScript the figures and captions in both themes, and without it the posters in the theme's palette.

[max-models]

docs / notebook (site, tutorial-05) and docs / notebook (site, tutorial-16-plotext-advanced) failed at the artifact upload, after their notebooks had run: GitHub's blob storage answered "The server is busy." Neither notebook is touched by this PR, so this is not its failure. I re-ran the failed jobs once.

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