Resolve airport codes to parent city in popular requests

Angular's getCityOrAirport walks airport→city when the input code is
an airport (SVO → Москва), only falling back to the airport name when
no parent city is dictionarised. React was returning the raw airport
name (Шереметьево) on the popular requests panel.

src/shared/hooks/useDictionaries.ts

@@ -26,6 +26,15 @@ export function useCityName(code: string): string {
   const city = dictionaries.cityByCode.get(upper);
   if (city) return city.name;
   const airport = dictionaries.airportByCode.get(upper);
-  if (airport) return airport.name;
+  if (airport) {
+    // Angular's `getCityOrAirport` resolves airport codes up to their
+    // parent city when possible (SVO → Москва) — only falls back to
+    // the airport name when the city isn't dictionarised.
+    const parent = airport.city_code
+      ? dictionaries.cityByCode.get(airport.city_code.toUpperCase())
+      : null;
+    if (parent) return parent.name;
+    return airport.name;
+  }
   return code;
 }