Dear Maintainer,

Summary:
KDE Discover cannot uninstall the Debian package "idle" and fails with
"appstream://idle.desktop not found in any available package source".

What happened:
When trying to uninstall IDLE (package: idle / idle-python3.13) via KDE Discover,
the operation fails with an AppStream error. The same package can be removed
successfully using apt.

Exact error message:
appstream://idle.desktop kann nicht geöffnet werden, da es in keiner verfügbaren Paketquelle gefunden wurde

What I expected:
Discover should correctly map the AppStream ID to the Debian package and uninstall it,
or at least fall back to apt.

Steps to reproduce:
1. Install idle and idle-python3.13 via apt
2. Open KDE Discover
3. Attempt to uninstall "IDLE (Python)"
4. Observe AppStream error

Additional information:
- Removing the package via apt works correctly
- Clearing AppStream and Discover caches resolves the UI error temporarily
- This appears to be an AppStream/Discover metadata mismatch

System:
- Debian (version: <your version>)
- KDE Plasma