v4.0.0

Breaking Changes

• Offset sign inverted — Positive offset now triggers earlier (matches AOS convention)
• Sentinel removed from observation — IntersectionObserver watches the element directly. Fixes animations inside overflow:hidden containers (fade-up, zoom-in-up, etc.)
• Sentinel only in debug mode — No invisible sentinel element by default

What's New

• delay, easing, threshold options
• AOS layer: anchorPlacement, mirror, disable(), destroy()
• TypeScript types for /aos export
• 55 Playwright E2E tests (API + AOS + landing integration)

Bug Fixes

• FOUC on init (no more opacity 1→0 flash)
• --delay not overwritten when undefined
• data-aos-offset="0" properly respected
• will-change released after animation
• Easing indentation bug