katex: KaTeX overline underline border implementation#1919

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MdSaifAliMolla wants to merge 2 commits intozulip:mainfrom

MdSaifAliMolla:katex-2

Commits on Nov 15, 2025

katex: Add CSS support and corresponding model tests for overline and underline borders.
MdSaifAliMolla
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katex: Render overline and underline and add widget tests
MdSaifAliMolla
committed