Async readState and added tokens for lifetime management of async operations. This should prevent crashes when the service is destroyed while async operations are still pending.

src/dbus/network/network_service.h

@@ -114,7 +114,7 @@ private:
   void rebindActiveDevice(const std::string& devicePath);
   void rebindActiveAccessPoint(const std::string& apPath);
   void ensureWifiDeviceSubscribed(const std::string& devicePath);
-  [[nodiscard]] NetworkState readState();
+  void readStateAsync(std::function<void(NetworkState)> onComplete);
   [[nodiscard]] NetworkChangeOrigin consumeWirelessEnabledChangeOrigin(bool enabled);
   void emitChangedIfNeeded(NetworkState next);
 
@@ -131,6 +131,7 @@ private:
   std::vector<AccessPointInfo> m_accessPoints;
   std::vector<VpnConnectionInfo> m_vpnConnections;
   std::vector<std::string> m_savedSsids;
+  std::shared_ptr<int> m_lifetimeToken;
   bool m_refreshInFlight = false;
   bool m_refreshQueued = false;
   bool m_scanning = false;