Frontend: UX redesign following reference screenshots #23

General frontend user-experience improvements, styled like the two reference screenshots in the Obsidian note (Pasted image 20260930142637 and 20260930142656).
Mainly I want to be able to see the full history of the event, and show only filtered (default) or all changes the system.
This allows you to see when the when the event was first found in the system or when every change occurred (with the information intheknow has)