- ReservationModal: add separate departure/arrival date+time fields with
type-specific labels (Departure/Arrival for flights, Pickup/Return for
cars, Start/End for generic types), timezone fields for flights
- DayPlanSidebar: getTransportForDay now matches reservations across all
days in their date range; shows phase badges (Departure/In Transit/
Arrival etc.) with appropriate time display per day
- ReservationsPanel: show date range when end date differs from start
- All 13 translation files updated with new keys
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