Implemented desktop cart button in navigation header that displays:
- Shopping cart icon with item count badge (red, top-right)
- Total cart price in German locale (EUR)
- Click opens CartSidebar via useCartUI() composable
- Responsive: visible only on lg breakpoint and above
- Hidden on mobile (FAB is used instead)
Uses useCart() composable for itemCount and total, with proper
Intl.NumberFormat formatting for EUR display.
Also standardized CartFAB price formatting to use Intl.NumberFormat
for consistency with rest of codebase.
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Co-Authored-By: Claude <noreply@anthropic.com>
Bastian Masanek