feat(host-groups): Add one-click scanning and navigation buttons

Add three action buttons to host group cards:
- Scan: One-click quick scan via /api/scans/quick endpoint
- View: Navigate to /scans filtered by host_group_id
- Report: Open compliance report dialog

Changes:
- Simplify imports by removing unused SCAP wizard components
- Add handleQuickScan for one-click Aegis scanning
- Add handleViewScans for scan history navigation
- Add handleComplianceReport for opening report dialog
- Simplify card design (remove blue border accent)
- Add Snackbar for success notifications after scan queue
- Update context menu with same actions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: remyluslosius