Widget templates: carousel, cards, popup, marquee, badge, minimal #17
Description
After the Wall of Love ships in v0.1, we need the rest of the widget templates:
- Carousel — horizontal slider with autoplay
- Simple Card — single testimonial display
- Popup/Toaster — floating notification in corner ("John from NYC just said...")
- Avatar Badge — stacked avatars + "Loved by 150+ customers"
- Marquee — infinite scrolling ticker
- Minimal — plain text, maximum style control for the user
Each template shares the same data fetching and Shadow DOM infrastructure from the embed system. The visual widget customizer (live preview in dashboard) should also land here.