Marcel 362a84dde9 fix(escapeHtml): cover apostrophe to harden single-quoted attribute use
Sina #5505 action item: escapeHtml escaped the four common entities but
not the apostrophe. Today every consumer uses double-quoted attributes,
but a future renderer change to single quotes would silently open a
stored-XSS hole. Cheaper to fix now, with a regression test.

Also pin the idempotence-by-composition property: a second call
re-escapes the & introduced by the first.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-29 01:09:13 +02:00
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