details: Keep spinner spinning while refreshing info after uninstall
After removing an app, its status changes to "UNKNOWN" while the information is refreshed to see if the app is available for reinstall. Especially with Flathub, this can leave quite a big gap (longer than it takes to actually uninstall the app) where nothing is happening and the user receives no visual feedback. During this gap, instead keep the spinner visible and spinning, and display "Cleaning up..." in the progress label. "Cleaning up" seems a reasonable description for this stage that's not overly technical or exposes details that the user isn't interested in.