[Bug]: No Visual indication for tab & arrow key navigation

[senntore]

Checklist

• [x] I am using an up-to-date version.
• [x] I have read the documentation.
• [x] I have searched existing issues.

TagStudio Version

Alpha 9.5.2

Operating System & Version

Mac OS 15.3.1

Description

I noticed that I can navigate via tab or arrow keys if a thumbnail is selected. Upon navigating via those keys, I can use space to select it & open it in the right panel. But there doesn't seem to be any visual indication when navigating the thumbnails, which makes it very difficult to use.

https://github.com/user-attachments/assets/3724c05d-cd03-4bf4-9b65-4568c855a2c8

Expected Behavior

When navigating via keyboard, there should be some visual indication similar to mouse hover.

Steps to Reproduce

1. Open TagStudio & either using Tab key or mouse navigate to thumbnails.
2. Use Tab or arrow keys navigate the thumbnails.
3. Use space key & see how the thumbnail is now selected

Logs

No response

[CyanVoxel]

The current behavior is due to the underlying Qt navigation not having been accounted for when developing the thumbnail grid, resulting in a lot of unintended half-feature quirks like this. Once #226 is implemented this should be resolved