Broken links of images should be hidden from thumbnail view & moved to a seperate view.

[senntore]

Describe the bug
Whenever there are unlinked or deleted images in a folder, OneFolder include (broken)thumbnails for them in the main thumbnail view of the folders.

To Reproduce
Steps to reproduce the behavior:

1. Close OneFolder if it's open.
2. Delete or move some images out of a folder.
3. Open OneFolder.
4. See the issue.

Expected behavior
I believe the unlinked or deleted images should be hidden by default & present in a separate view for more actions.

OneFolder version
v1.0.12

Desktop OS
Pop!_OS 22.04