- Change default scan type from 'os' to 'quick' (much faster)
- Add -T4 timing template for aggressive speed
- Add --min-hostgroup for parallel host scanning
- Remove slow OS detection from quick scan
- Add time estimates in UI: ping ~30s, quick ~1-3min, os ~5-15min
- Color-coded scan options by speed
- ping scan: fastest, just host discovery
- quick scan: top 100 ports, no OS detection
- New Scan History tab shows all past scans
- Each scan shows: tool, target, status, timestamp, findings count
- Rescan button to quickly re-run any previous scan with same settings
- Copy command button copies scan command to clipboard and terminal
- Clear All button to purge scan history
- Relative timestamps (e.g. '5 min ago', '2 hours ago')
- Status badges: running (yellow), completed (green), failed (red)
- Backend endpoints for clearing scan history