Apps added via the Share Sheet silently fail if they aren't in your App Store region

If an app isn't published in your device's App Store region (for example it's only available in another country), adding it to WidgetLoft via the Share Sheet doesn't actually add it to your library, even though you see an "added" confirmation.

We plan to show a clear warning when an app can't be added, and to try resolving it from other countries' stores.