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)

graphql/operations/public/geo/GetNodes.graphql

@@ -1,5 +1,5 @@
-query GetNodes($limit: Int, $offset: Int, $transportType: String) {
-  nodes(limit: $limit, offset: $offset, transportType: $transportType) {
+query GetNodes($limit: Int, $offset: Int, $transportType: String, $country: String) {
+  nodes(limit: $limit, offset: $offset, transportType: $transportType, country: $country) {
     uuid
     name
     latitude
@@ -9,5 +9,5 @@ query GetNodes($limit: Int, $offset: Int, $transportType: String) {
     syncedAt
     transportTypes
   }
-  nodesCount(transportType: $transportType)
+  nodesCount(transportType: $transportType, country: $country)
 }