Upgrade the JavaScript bundles inlined into the offline HTML export:
DOMPurify 3.1.7 -> 3.4.9 (clears 10 OSV advisories), marked 12.0.2 -> 18.0.5,
highlight.js 11.9.0 -> 11.11.1. mermaid 10.9.6 and MathJax 3.2.2 are kept
(no known CVEs) and now guarded rather than chased.
Pin every bundle in assets/web_export/MANIFEST.json (npm name, version, source,
sha256, licence) and add tool/check_bundled_js.dart: it verifies each file
still matches the manifest hash and queries the OSV database for known
vulnerabilities. Wired as `make deps-check`, into `check-full`, and into CI
next to the licence check. THIRD_PARTY_NOTICES.md updated for the now-standalone
DOMPurify bundle.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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