Davy Notebooks transcription task doesn't warn about unsaved work

[eatyourgreens]

Package

lib-classifier

Describe the bug

If I create a new annotation from a previously transcribed line then leave the page, I'm not warned that I have unsaved work.

Screen.Recording.2021-11-24.at.10.34.17.mov

To Reproduce

Steps to reproduce the behavior:

1. Go to the Davy Notebooks project.
2. Transcribe a subject that has previous transcriptions (purple lines.)
3. Leave the page before saving the classification.

Expected behavior

On leaving the page, I should be interrupted by a browser popup warning me that I've got unsaved work.