fix(web): correct type assertion for MiniMap nodeColor

Use double assertion (as unknown as) to satisfy TypeScript strict mode

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

Author: 7Jerrybf

web/src/components/TopologyGraph.tsx

@@ -139,7 +139,7 @@ export function TopologyGraph({ data, onNodeClick }: TopologyGraphProps) {
       <Controls className="!bg-white !border-slate-200 !shadow-md" />
       <MiniMap
         nodeColor={(node) => {
-          const nodeData = node.data as TopologyNodeData | undefined;
+          const nodeData = node.data as unknown as TopologyNodeData | undefined;
           switch (nodeData?.type) {
             case 'COMPONENT':
               return '#10b981';