No Carousel Performance Optimization for Large Lists

With 100+ properties, the Carousel might lag:
```
// Current: Renders all items
<Carousel>
  {properties.map(p => <PropertyCard property={p} />)}
</Carousel>

// Should support:
<Carousel virtualized> // Virtual scrolling for performance
  {properties.map(p => <PropertyCard property={p} />)}
</Carousel>
```