- Change modal z-index from z-50 to z-[1000] to appear above Leaflet map
- Replace bg-primary with bg-blue-600 for visible button styling
- Fix 'Adicionar' button in ProductOffersModal
- Fix 'Ver ofertas' button in GroupedProductCard
- Add Shell layout to restore header navigation
- Filter out products from logged-in user's own pharmacy
- Group medications by name (e.g., Losartana 50mg shows as 1 card with '3 offers')
- Create GroupedProductCard component with offer count badge
- Create ProductOffersModal with sorted offers and add-to-cart
- Implement advanced filters (price range, minimum expiry days)
- Add GroupedProduct interface to types
- Sort grouped products by lowest price
