UI improvements student list

Description / Overview

The student list is a great overview over the correction progress but dearly needs more contextual information on the status of the students submissions corrections.

Use cases

Reviewers who want to get an extensive overview about the correction progress at a glance.

Links / references

Feature checklist

• stronger visual cue which submission is selected
• mark submissions with conflicting feedback red
• subtly mark assigned submissions and display assigned tutor in tooltip