fix: unblock pnpm test after the KaTeX math change

[wayne930242]

Follow-up to #1. On core, pnpm test fails before Vitest starts, and one new test is flaky under the full suite.

• scripts/vercel-sparse-non-deploy-paths.mjs: feat(web): render $…$ and $$…$$ math with KaTeX #1 added the top-level vitest.config.ts, which the sparse-path check rejects (Top-level path 'vitest.config.ts' is neither in .github/vercel-sparse-paths.txt nor a known non-deploy path.). It only configures tests, so it is classified as non-deploy.
• apps/web/src/components/live-markdown/math.test.ts: the first CodeMirror parse runs on a time budget, so under full-suite load the fenced code block at the end of the fixture could still be unparsed and its $$y$$ was drawn as math (expected [ true, true ] to deeply equal [ true ]). The test now finishes the parse and lets the decorations recompute before asserting, which is what the editor does once its parser catches up. Editor behaviour is unchanged.

Verification: pnpm test twice in a row, 197 files / 1402 tests passing each time; pnpm lint clean; tsc --noEmit in apps/web passes.

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2 Skipped Deployments

Project	Deployment	Actions	Updated
my-gh-core	Ignored		Sep 27, 2026 8:18am UTC
mygitnotes-gitlab-test	Ignored	Preview	Sep 27, 2026 8:18am UTC

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