M9: Impact diagram with live cluster topology

[CodeBuildder]

Goal

Replace the static AI assessment panel with a live cluster impact diagram showing affected nodes, pods, risk levels, and blast radius visualization.

Tasks

• Build ImpactDiagram React component
• Show all 3 nodes with real IP addresses
• Show pods per node with threat/risk/safe/isolated status
• Animate scan line across diagram
• Show risk bars: data exposure, lateral movement, service disruption, node compromise
• Pull real data from /incidents endpoint (node, pod, namespace fields)
• Wire into ThreatFeed detail panel replacing static text

Acceptance criteria

• Impact diagram renders for every incident
• Node and pod status reflect real enrichment data
• Risk bars animate on load
• Scan line animates continuously