gnezim cb61cafbf1 Fix three parity issues from final audit
1. Route heading uses airport name when a code maps only to an airport
   (SVO → 'Шереметьево') but prefers the city when the code is a city
   too (LED → 'Санкт-Петербург', not 'Пулково'). Angular does the
   same. Apply the new lookup order in both the onlineboard and
   schedule search pages.

2. Append ', Сегодня' (or 'DD.MM.YYYY' for other dates) to the board
   search heading, matching Angular.

3. Render the '+1' day-change marker on FlightCard even when only
   scheduled times are known. Previously the fallback pulled the value
   from `actualBlockOff/On.dayChange`, which is undefined for
   scheduled-only flights — so overnight flights like SU 6805
   (23:30 → 00:55 +1) showed no indicator. Read
   `scheduledDeparture/Arrival.dayChange.value` when the actual block
   time is missing.

4. Localize the PrimeReact Calendar widget: register a Russian locale
   in [lang]/layout.tsx and set the active one on every locale change,
   so 'Choose Date' reads 'Выбрать дату' and month/day names localize.
2026-04-18 14:10:26 +03:00
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