fix(math): load KaTeX lazily and show TeX source when it can't typeset

fix(math): load KaTeX lazily and show TeX source when it can't typesetcomarkdown/comark #514 · 2 diagrams

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01 / 05Shared typeset cache added to math pluginCached HTML avoids re-parsing math on every streaming update and scroll. caches up to 500 rendered expressions in +92 −3.
02 / 05KaTeX now loads dynamically on demandPages without math skip the KaTeX bundle entirely.loadKatex imports the on first demand in +92 −3.
03 / 05UI adapters delegate math renderingReact, Vue, Svelte, Angular and HTML components call the core helper. call typesetMath & loadKatex instead of importing KaTeX directly.
04 / 05Invalid or pending math now shows sourceUnfinished TeX and loading states stay readable as raw source text. render raw source when returns empty or undefined.
05 / 05Everything this change touchedDynamic loading, caching, and fallback rendering across all framework adapters.

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