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Fix "File ended" LaTeX error in PDF export caused by double-escaping of th cells (#5717)

* Initial plan

* Fix th element double-escaping in LaTeX PDF export causing File ended error

When a table header cell (th) contained nested inline formatting like
<u><b>text</b></u>, the generated LaTeX content was being passed through
latex_escape() a second time in process_element's else branch. This
double-escaping would corrupt nested LaTeX command structures: the outer
closing } of e.g. \underline{\textbf{...}} would be escaped to \}, which
is a literal character rather than a group closer. This left the LaTeX
group unclosed, causing lualatex's xltabular scanner (\TX@get@body) to
consume the rest of the file looking for the closing brace.

Fix: add 'th' to the `when 'td'` branch so th cells return their
already-processed content directly, just like td cells do.

Closes #5716

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

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