The read-only shared view showed the overall trip start/end airports and
the first leg's flight number on every leg of a multi-leg flight. The Day
Plan already expands legs (each carries __leg), but the renderer ignored it
and read flat top-level metadata; the Bookings tab had the same bug.
- Day Plan: use __leg for per-leg airline/flight number/route, plus dep-arr time
- Bookings tab: list each leg via getFlightLegs()
- unique React keys for multi-leg rows
Closes#1219
jubnl