US-20 Confirmation when discarding unsaved changes

User story

As a librarian, I want the environment to warn me before discarding unsaved changes so that I don't accidentally lose progress.

Prerequisites

• The editor works.

Acceptance criteria

• Users get a confirmation window when they close the editor without saving.
• The confirmation window should have the following options: "Save as draft and exit", "Don't save and exit" and "Cancel".
• All 3 options work and changes are not discarded unless the user specifies so.

Sprint Ready Checklist

1. Acceptance criteria defined
2. Team understands acceptance criteria
3. Team has defined solution / steps to satisfy acceptance criteria
4. Acceptance criteria is verifiable / testable
5. External / 3rd Party dependencies identified