Is there a recommended starting point or bridge from 10k to half/full marathon?

The half/full marathon training program and 10K training program are significantly different, so there is no direct bridge. But what you can do is just peek ahead (by scrolling) and see what would be a comfortable starting point for you. Most of our users seem to find week 5 as a good starting point.

As a reminder, once you pick a starting point, you can always double-tap (iOS) or long-press (Android) workouts to mark them as complete, so that the app will remember your progress.