Implement unified catalog search with token-based filtering

- Add useCatalogSearch composable for managing unified search state
- Add UnifiedSearchBar component with token chips for filters
- Add CatalogHero component for empty/landing state
- Create grid components for each display mode:
  - CatalogGridProducts, CatalogGridSuppliers, CatalogGridHubs
  - CatalogGridHubsForProduct, CatalogGridProductsFromSupplier
  - CatalogGridProductsInHub, CatalogGridOffers
- Add unified catalog page at /catalog with query params
- Remove SubNavigation from catalog section (kept for other sections)
- Update all links to use new unified catalog paths
- Delete old nested catalog pages (offers/suppliers/hubs flows)
- Add i18n translations for catalog section

app/components/GoodsContent.vue

@@ -54,8 +54,8 @@ const selectProduct = (product: any) => {
   if (locationUuid) {
     // Both product and hub selected -> show offers
     navigateTo({
-      path: `/catalog/offers/${product.uuid}/${locationUuid}`,
-      query
+      path: `/catalog`,
+      query: { product: product.uuid, hub: locationUuid, ...query }
     })
     return
   }