Diff viewed files: Make visual difference more evident

Sascha Eggenbergerrequested to merge
increase-viewed-files-visual-difference into master

What does this MR do and why?

Diff viewed files: Make visual difference more evident between unreviewed and reviewed files in the file tree.

Also adds some design token migrations.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before After
before after
before_dark after_dark

How to set up and validate locally

  1. Go to a MR with multiple files
  2. Check some files as «Viewed»

Related to #499695 (closed)

Closes #504347 (closed)

Edited by Sascha Eggenberger

Merge request reports