C1: cssPropsToString emitted the camelToKebab'd style-object KEY
unsanitized while only sanitizing the VALUE. A malicious style key
containing a quote (reachable via AI update_props or deserialized
saved state) could close the style="..." attribute and inject a live
element. Now validates each key against a CSS property/custom-prop
allowlist and drops anything that doesn't match.
C2: buildDataAttrs (html-export.ts) interpolated props.animation and
props.animationDelay directly into data-animation="..."/
data-animation-delay="..." with no escaping, for every exported node.
Now routes both through escapeAttr.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>