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/pages/catalog/hubs/index.vue

@@ -8,7 +8,10 @@
     @select="onSelectHub"
   >
     <template #filters>
-      <CatalogFilterSelect :filters="filters" v-model="selectedFilter" />
+      <div class="flex gap-2">
+        <CatalogFilterSelect :filters="filters" v-model="selectedFilter" />
+        <CatalogFilterSelect :filters="countryFilters" v-model="selectedCountry" />
+      </div>
     </template>
 
     <template #card="{ item }">
@@ -45,7 +48,9 @@ const {
   items,
   total,
   selectedFilter,
+  selectedCountry,
   filters,
+  countryFilters,
   isLoading,
   isLoadingMore,
   itemsByCountry,