Purge v1.1.2

Refactor cache scanning and enhance UI for lifetime stats

- Updated CacheScanner to enforce deletion safety checks, ensuring only paths offered for cleanup are processed.
- Refined DeletionSafetyPolicy to include new methods for evaluating cleanup eligibility, improving safety during file deletions.
- Enhanced PurgeStore to manage lifetime statistics, including a cap on total recovered bytes and displayable stats in the AboutView.
- Improved AboutView layout to present lifetime cleaning statistics more clearly, enhancing user engagement and understanding of the app's performance.

These changes collectively improve the application's safety during cache management and enhance the user experience with clearer lifetime statistics.