When using Sphinx 9 with MathJax 4, some multline equations have a scrollbar that is not necessary: <img width="1018" height="148" alt="Image" src="https://github.com/user-attachments/assets/7c9abcba-d24f-4046-9fcc-bc1e87b324bb" /> The scrollbar goes away when either removing `overflow: auto` or increasing `padding-bottom` to `0.5rem` in `div.math > mjx-container` (defined [here](https://github.com/pydata/pydata-sphinx-theme/blob/213af5a59dd18500fdc3b82fb49afc89a54fff33/src/pydata_sphinx_theme/assets/styles/content/_math.scss#L39)).
