Bug: on mobile portrait, content of cgv.html and
politique-confidentialite.html stays invisible because the
.animate-on-scroll blocks (data-lang-block FR/EN/MG trilingual
content) are 2000-3000px tall and the viewport (~600px) never
reaches the 10% intersection ratio required to trigger the
.visible class.
Symptom: page appears empty on mobile until user resizes the
window (= triggers re-evaluation). Reported by Serge during
post-cutover E2E retest 2026-05-07.
Other pages (mentions-legales, accueil, etc.) unaffected because
their .animate-on-scroll blocks are short enough to satisfy the
previous 10% threshold.
Fix: threshold: 0 fires as soon as any pixel of the element
enters the viewport. rootMargin -50px bottom kept to give a small
buffer before triggering animation.
Refs: post-cutover polish (companion to PR #6 chore polish).
