GET /api/trips/active answers with the trip a user means by "my trip"
right now: the one running today, else the next one starting, else the
most recently started. Archived trips never qualify.
That order is the dashboard hero's (sortTrips), on purpose - the startup
redirect this is for has to land on the same trip the dashboard features,
or the two would disagree about which trip is yours.
Kept apart from list() because it runs on a first paint: four columns of
one row instead of every trip with its per-trip day and place counts.
Maurice
99ee307034