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)

i18n/locales/en/catalogHubsSection.json

@@ -11,6 +11,7 @@
     },
     "filters": {
       "all": "All",
+      "all_countries": "All countries",
       "auto": "Auto",
       "rail": "Rail",
       "sea": "Sea",