Hi...I'm going to add this as a bug as I'm pretty sure it is not the intended behaviour.
When on the iPhone app, after performing a search (be it inside a playlist or the general search) there is no way to swipe on a track and perform the secondary actions. This is very frustrating for queuing songs and creating the "Now Playing" playlist, as the track can only be played "Now" and not queued.
I hope this explanation was clear, please let me know if there's more information needed. Also, please help me bring this into the attention of Spotify Staff.
Have a good day,