Add a 'Recently Cleaned' summary to the Smart Scan results view

[iliyami]

After a Smart Scan cleanup, the user gets a generic "X freed up" — we should show what was cleaned, broken down by module.

Task

After cleanup completes in SmartScanView, show a small breakdown:

✓ System Junk         1.2 GB
✓ Malware Removal     12 MB (3 items)
✓ Privacy             340 MB

Files to change

• Sources/MacClean/Views/SmartScan/SmartScanView.swift (doneView section)