With empty availableDates every day button rendered as [disabled],
leaving the user unable to navigate between days while the /days API
loads (or for routes where the calendar endpoint hasn't been wired
yet). Treat an empty availableDates array as 'unknown' — don't disable
anything, matching Angular's behaviour where tabs are tappable until
the upstream tells us a specific day has no flights.
gnezim
a0176cc336