Upgrade Schedule prefill codes to CitySuggestion objects once dictionaries load

ScheduleStartPage previously stored the raw IATA code from the prefill
in departureAirport / arrivalAirport state, so PrimeReact's AutoComplete
would render 'MOW' (or 'SVO' before the prior commit) literally in the
input. Now, once dictionaries resolve, the effect replaces each string
slot with a { code, name } object so the autocomplete shows 'Москва'.

Mirrors Angular CityAutocomplete.writeValue → getCityOrAirport, which
upgrades the bound string to a CityModel for display while keeping the
code as the outbound form value.

src/features/schedule/components/ScheduleStartPage.tsx

@@ -7,7 +7,7 @@
  * @module
  */
 
-import { type FC, useState, useCallback, type FormEvent } from "react";
+import { type FC, useState, useCallback, useEffect, type FormEvent } from "react";
 import { useNavigate } from "@modern-js/runtime/router";
 import { useLocale } from "@/i18n/useLocale.js";
 import { Calendar } from "primereact/calendar";
@@ -92,6 +92,36 @@ export const ScheduleStartPage: FC = () => {
 
   const [departureAirport, setDepartureAirport] = useState<CitySuggestion | string>(prefill.departure ?? "");
   const [arrivalAirport, setArrivalAirport] = useState<CitySuggestion | string>(prefill.arrival ?? "");
+
+  // Prefill arrives as a bare IATA code ("MOW"). Once dictionaries are
+  // loaded, upgrade each state slot to a `{code, name}` CitySuggestion
+  // so the PrimeReact AutoComplete renders "Москва" rather than the raw
+  // code. Mirrors Angular's CityAutocomplete.writeValue + getCityOrAirport.
+  useEffect(() => {
+    if (!dictionaries) return;
+    const resolve = (code: string): CitySuggestion | null => {
+      const upper = code.toUpperCase();
+      const city = dictionaries.cityByCode.get(upper);
+      if (city) return { code: city.code, name: city.name };
+      const airport = dictionaries.airportByCode.get(upper);
+      if (airport) {
+        const parentCode = airport.city_code?.toUpperCase();
+        const parent = parentCode
+          ? dictionaries.cityByCode.get(parentCode)
+          : null;
+        if (parent) return { code: parent.code, name: parent.name };
+      }
+      return null;
+    };
+    setDepartureAirport((current) => {
+      if (typeof current !== "string" || !current) return current;
+      return resolve(current) ?? current;
+    });
+    setArrivalAirport((current) => {
+      if (typeof current !== "string" || !current) return current;
+      return resolve(current) ?? current;
+    });
+  }, [dictionaries]);
   // Start blank to match Angular's `ДД.ММ.ГГГГ - ДД.ММ.ГГГГ` placeholder
   // (the "current week" pre-fill was a React-only convenience that
   // pulled the date input out of parity). Submit handler defaults to