Enhancement: animations and animated showcase carousel

[jlowin]

The welcome page showcase is static. Adding motion — entrance animations, an auto-advancing carousel, or animated transitions between examples — could make the first impression significantly more compelling and better demonstrate the range of what Prefab can build.

Some directions worth exploring:

• Auto-advancing carousel or slideshow cycling through showcase examples
• Entrance animations on the showcase cards (staggered fade/slide-in)
• Animated transitions when switching between examples in the playground
• A looping "hero" demo that runs live component interactions without user input

This is an open-ended design question as much as an engineering one — the right answer depends on what feels polished vs. noisy for a developer-facing product.