fixing text mode behaviour and adding \math command

[Shrookin]

Summary

• add a \math{} command that parses its body as math inside prose, as the inverse of \text{}
• remember whether LaTeX entry began in text or free-text and restore that prose mode after bounded or unbounded completion
• allow nested LaTeX commands and spaces inside an open bounded entry, including \math{\forall x \land \frac{1}{2}}
• keep math placeholders in math mode until they are filled
• publish matching runtime bundles

PR structure

This is intentionally stacked on the free-text implementation from arnog#3060 so the diff directly covers both text and free-text. It can be retargeted after that prerequisite lands.

Verification

• npx tsc --noEmit
• npx jest test --runInBand (335 passed)
• full Chromium physical-keyboard suite (48 passed)
• focused source/watch tests in Chromium, Firefox, and WebKit (9 passed)
• focused tests repeated against the checked-in dist/mathlive.mjs artifact in Chromium, Firefox, and WebKit (9 passed)
• targeted ESLint and Prettier checks

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[Shrookin]

Closed in favor of the canonical upstream PR: arnog#3069