UI improvements: filters, map layout, search bar

- Add hubCountries query and country filter for hubs page
- Add getAvailableProducts query for offers (only products with active offers)
- Add sourceLatitude/sourceLongitude to orders GraphQL
- Fix ListMapLayout with position fixed for proper map height
- GlobalSearchBar: make fields wider, remove unit selector
- Remove status/isVerified filters from suppliers/offers (backend handles this)

app/composables/useCatalogProducts.ts

@@ -1,4 +1,4 @@
-import { GetProductsDocument } from '~/composables/graphql/public/exchange-generated'
+import { GetAvailableProductsDocument } from '~/composables/graphql/public/exchange-generated'
 
 // Shared state
 const items = ref<any[]>([])
@@ -13,12 +13,12 @@ export function useCatalogProducts() {
     isLoading.value = true
     try {
       const data = await execute(
-        GetProductsDocument,
+        GetAvailableProductsDocument,
         {},
         'public',
         'exchange'
       )
-      items.value = data?.getProducts || []
+      items.value = data?.getAvailableProducts || []
       isInitialized.value = true
     } finally {
       isLoading.value = false