[Bespoke transitions] Compatibility with Safari

[yhatt]

This issue is for tracking transitions compatibility with Safari. View Transition is testable in Safari 18 (macOS Sequoia, iOS 18, and iPadOS 18).

https://marp-cli-page-transitions.glitch.me/ https://marp-cli-page-transitions.glitch.me/morph.html

• [ ] The timing of animation timing functions do not match between the outgoing slide and incoming slide
• [ ] drop: The incoming slide is slipping while dropping
• [ ] rotate: Rotating animation has too showy effect