💄 fix(pricing-card): align skeleton responsive grid with actual card layout
- Update PricingCardSkeleton grid classes from 'sm:grid-cols-2 lg:grid-cols-3'
to 'xl:grid-cols-2 2xl:grid-cols-3' to match PricingCardView layout
- Ensures consistent column count between skeleton and actual content
at same screen sizes
- Improves loading state visual consistency across different breakpoints