Fix Sphinx 7.x compatibility in poster directive

[ikerexxe]

Update render_partial() key access from 'html_body' to 'fragment' for Sphinx 7.x while maintaining backward compatibility with older versions.

[gemini-code-assist]

Summary of Changes

Hello @ikerexxe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a compatibility issue with Sphinx 7.x within the poster directive by modifying the node_to_html utility function. The change introduces a flexible approach to extract rendered HTML content, first attempting to use the 'fragment' key (introduced in Sphinx 7.x) and then falling back to the 'html_body' key for older Sphinx versions. This ensures the directive continues to function correctly across different Sphinx environments without breaking existing implementations.

Highlights

• Sphinx 7.x Compatibility: Updated the node_to_html function to support Sphinx 7.x by checking for the 'fragment' key in the builder.render_partial() output.
• Backward Compatibility: Ensured backward compatibility with older Sphinx versions by falling back to the 'html_body' key if 'fragment' is not present.
• Robust Error Handling: Added a KeyError to catch cases where neither 'fragment' nor 'html_body' is found, providing clearer debugging information.

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[gemini-code-assist]

Code Review

This pull request updates compatibility with Sphinx 7.x by modifying how rendered HTML partials are accessed. The change correctly checks for the new 'fragment' key while maintaining backward compatibility with the older 'html_body' key. The implementation is sound and includes appropriate error handling. I have provided one suggestion to refactor the key-checking logic to be more idiomatic and maintainable.