- Add 10s startup grace period before TUN auto-disable logic activates;
service IPC may not be ready when the frontend first queries, causing
a transient isServiceOk=false that incorrectly persists
- Replace placeholderData (which set isLoading=false with stale data)
with a proper isStartingUp guard; query now polls every 2s during
startup to catch service readiness quickly
- Add 'getSystemState' to refresh-verge-config invalidation keys to
fix key mismatch that prevented event-driven refetches from working