Add 2-hour countdown warning before auto-scan with amber styling

[techmore]

When an auto-scan is scheduled to run, display a prominent 2-hour countdown warning on the frontend using bright amber colors (similar to the 'Private' styling in network topology). This gives users advance notice before automated scans begin.

Current state:

• Auto-scans run silently in the background
• No frontend warning before scan execution
• Users may be unaware of impending automated activity

Desired functionality:

• Show countdown banner 2 hours before auto-scan starts
• Use amber color scheme (text-amber-500/600) for visibility
• Display remaining time prominently
• Include scan details (target, type, etc.)
• Allow users to cancel or modify if needed
• Auto-hide when countdown reaches zero

Implementation details:

• Integrate with existing auto-scan scheduling logic in
• Add Socket.IO events for countdown updates
• Create warning banner in with amber styling
• Update every minute to show remaining time
• Position prominently but non-intrusively

Location: Modify auto-scan logic in and add frontend banner in .

This will improve user awareness and control over automated scanning activities.