Remove before, now and after buttons
Always try to search some additional itineraries before and after the selected time. Note: filling earlier searches can be hard as we do not know how much to step back in time. Maybe use same kind of reversed scan as 'earlier' button does now. It is a slow way, though. This logic will most likely be quite complicated, so maybe we implement it in OTP side.
Scroll shows the prefetched set and launches a search to get more itineraries in the scroll direction
Questions for design:
What happens to the time selector value?
Do we keep the fetched itineraries or recalculate them when user scrolls back and forth?