fix(jsx-ast): preserve generated footnotes

[panva]

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Project	Deployment	Actions	Updated (UTC)
api-docs-tooling	Error		May 18, 2026 5:02pm

[cursor]

PR Summary

Medium Risk
Moderate risk because it changes post-processing of the root AST structure, which can affect document rendering/order across different MDX trees, but it’s narrowly scoped and covered by a new unit test.

Overview
Ensures generated GFM footnotes aren’t dropped or inserted into a hard-coded subtree by detecting the footnotes <section> via dataFootnotes/footnotes class, removing it from the root, and appending it to the Layout node’s children (or back to root if no Layout exists).

Adds a focused unit test asserting that the transformer moves the footnotes section under Layout rather than leaving it at the root.

^{Reviewed by Cursor Bugbot for commit dcc2876. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

❌ Patch coverage is 94.28571% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.85%. Comparing base (fb15e44) to head (dcc2876).

Files with missing lines	Patch %	Lines
src/generators/jsx-ast/utils/transformer.mjs	85.71%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #797      +/-   ##
==========================================
+ Coverage   82.82%   82.85%   +0.02%     
==========================================
  Files         169      170       +1     
  Lines       14670    14732      +62     
  Branches     1259     1266       +7     
==========================================
+ Hits        12151    12206      +55     
- Misses       2513     2520       +7     
  Partials        6        6              

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