Hook up system signature tracker

src/components/RegionMap.tsx

@@ -102,8 +102,7 @@ export const RegionMap: React.FC<{ regionName: string }> = ({ regionName }) => {
   }, [systems]);
 
   const handleSystemClick = (systemName: string) => {
-    console.log(`Clicked system: ${systemName}`);
-    // Future: Navigate to system details
+    navigate(`/systems/${systemName}`);
   };
 
   const handleMouseDown = useCallback((e: React.MouseEvent) => {