Change the 'Nettoyer' (Cleanup) button behavior to remove unwanted downloads:
Before:
- Only removed completed downloads
Now:
- Removes cancelled downloads
- Removes failed downloads
- Removes completed downloads
- Keeps only: downloading, paused, pending downloads
- Shows detailed count by status in confirmation dialog
- Better title tooltip explaining what gets deleted
The confirmation message now shows exactly what will be deleted:
- 'Supprimer X annulé(s) Y échoué(s) Z terminé(s)?'
This makes it easy to clean up the download history while keeping
active downloads safe.