AI Animation Battle: Handshake 🤝 Which AI did it best? Prompt: Create a single-file with HTML/CSS/vanilla JS only (no libraries/assets) that renders two arms extending from opposite sides of a centered square scene container. Hands meet in the middle, shake briefly up and down, then separate and reset. Motion should be clear and readable. Total loop length: 30 seconds, seamless. Add a Start button below the square that starts the animation when clicked.