Svelte Guideline: Animation — Use Lottie for designer animations. Description: After Effects exports for onboarding empty states and celebrations. Do: lottie.loadAnimation({ container, path: '/animations/success.json' }). Don't: Lottie for simple UI micro-interactions. Good Example: lottie.loadAnimation({ loop: false, autoplay: true }). Bad Example: <LottiePlayer> for button hover. Severity: Low. Docs: https://lottiefiles.com.