feat: add Card component with fusion design system
- Created card.css with 6 variants:
* Default (Dark cyber with hover glow)
* Manga (Speed lines with clip-path)
* Neon (Glowing borders and gradients)
* Nature (Organic botanical style)
* Elevated (Floating with shadows)
* Glass (Glassmorphism with backdrop blur)
- Added Card subcomponents: CardHeader, CardTitle, CardBody, CardFooter
- Implemented spacing modifiers (compact, normal, spacious)
- Added interactive, borderless, and flat modifiers
- Full dark mode support
- Smooth hover animations and transitions
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