Thanks to Patterson for writing a nice guide for the keyboard navigation here. It makes the keyboard arrow inputs behave like joystick buttons in that they can hover correctly render hover/unhover.
Also big thanks to Nicolae (Xelu) Berbece for providing the icons for keyboard/controller key logos ("Content/UI/ButtonIcons"). Full credits are included in ButtonIcons_Readme.txt.
This project is set up with Git LFS, as a measure against uploading large asset files to git. For this reason, the "Clone -> Download ZIP" unfortunately doesn't work as it does not properly download the LFS files. The safest way is through git command-line:
git clone git@github.com:alexpanter/TestCommonUI.git
NOTE: This project has only been tested with Unreal 5.4.