Show hint about which face is being identified on the "People" page

## 🚀 Feature Requests

When opening a bunch of tabs to unidentified people for the purpose of individually merging them, it would help to show who's face is actually being watched.


Which one was I identifying again?

### Contextualize the feature

The face icon can be on the top of the page, or the picture in the information panel on the right could have the face indicator circle for the currently viewed unidentified person marked with a different color or line style to distinguish from the rest.