Function
The action reads Start course, Continue where you left off or Watch
again, decided upstream by courseOverviewProgress. Its hit area stretches
over the whole tile without adding a second link.
Until progress has been read the tile shows placeholders of its text and action, so a returning learner never sees Start course swap to Continue.
The course overview's one way in: the video the learner continues with, as a large artwork tile with its position, title and a single action.