Create a reusable product card component with four variants:
- :default (collection page) - full details with category
- :featured (home page) - hover animation, badges
- :compact (pdp related) - smaller, no badges/delivery
- :minimal (error 404) - smallest, not clickable
Accessibility improvements:
- Use <a> for all clickable cards (keyboard nav, screen readers)
- Use <div> only for non-clickable decorative cards
Unified badge logic with priority: Sold out > New > Sale
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>