useCityName was a 'phase 2 stub' that returned the IATA code
unchanged, so the popular-requests panel read 'Маршрут: SVO - LED'
instead of 'Маршрут: Шереметьево - Санкт-Петербург'. Rewire the hook
to read the current locale and look up cityByCode / airportByCode
from the loaded dictionaries, falling back to the code only while
dictionaries are loading or for unknown codes (matches Angular's
DictionariesService.getCityOrAirport).
Tests expanded to cover the city/airport resolutions and the
loading / unknown fallback paths (5 total, 1258 suite green).
gnezim
db163f5645