fix(lint): resolve remaining ESLint errors (unused vars, any types, react-refresh)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/setup/SetupWizard.tsx

@@ -353,6 +353,7 @@ function VerifyConnectivityStep({ tenantId, deviceId, onComplete }: Step3Props)
   }, [tenantId, deviceId, cleanup])
 
   useEffect(() => {
+    // eslint-disable-next-line react-hooks/set-state-in-effect
     startPolling()
     return cleanup
   }, [startPolling, cleanup])