window-list: Hard to differentiate between window and workspace thumbnail
In gnome-shell-extensions 45.1 on Fedora 39, I sometimes find it hard to identify where the last window ends and the first workspace begins. This happens when trying to click either the last window or the first workspace. A screenshot:
This is caused by the fact that:
- windows and workspaces have the same appearance
- there's no separator or gap between the windows and the workspaces
- the contrast issues covered by #484
This will need design.