Highlight unread feedback entries in list

[timobrembeck]

Motivation

In the feedback list, unread elements should be highlighted.

Proposed Solution

Think about a good way to highlight lines - also with respect to our two different color schemes in light mode and dark mode. E.g.:

• Different background color for the rows (caveat: might conflict with the alternating backgrounds of the normal list)
• Make unread elements bold and read elements regular
• Show small colored (e.g. yellow/orange) border on the left side

Additional Context

This might be more complicated than expected, I see three options here:

1. Override the list template
2. Do the highlighting in JS
3. Add https://github.com/litchfield/django-liststyle

Just for reference: This is how we highlight feedback in the Integreat CMS: