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* feat(sci): add 4chan-style TeX support with MathJax on /sci/ - [math]/[eqn] tags typeset with MathJax 3 (lazy chunk, only on /sci/ with math present) - 4chan-identical config: Safe mode, left-aligned eqn, neutered \color/\newcommand macros - TeX button in reply modal title bar opens live TeX Preview modal - /sci/ post form rules bullets for [math]/[eqn] usage and right-click source - MathJax context menu on right-click (Show Math As > TeX Commands) - woff fonts served from node_modules in dev and emitted into build * feat(sci): finish TeX support: configmacros fix, preview preload, translations, tests - add configmacros package so the 4chan macro neutering (\color, \newcommand, ...) applies - preload MathJax when the TeX Preview opens, like 4chan - stable closeModal callback for the preview modal - pre-bundle mathjax components in vite optimizeDeps to avoid dev mid-session reload - translate the 6 new TeX keys into all 35 languages - markdown math segment component tests + math-tags unit tests * feat(reply modal): add sci tex preview button * fix(tex-preview): clear MathJax bookkeeping and pending typeset on close Addresses Cursor Bugbot: the preview output was typeset via typesetMathElement but never passed to clearMathElement on unmount, so repeated open/close cycles kept detached nodes in MathJax's math list. Also cancels the pending debounce timer. * fix(reply-modal): reset TeX preview state when the reply modal closes Addresses CodeRabbit: showTexPreview persisted across close/reopen like the bbcode preview flags, so the TeX preview would auto-open on the next reply.