[@mantine/hooks] Fixed initial value of the online attribute return…

…ed by `useNetwork()` in Firefox (#5766)

* [@mantine/hooks] Fixed initial value of the `online` attribute returned by `useNetwork()`

* Update use-network.ts

[@mantine/hooks] Set the online status for environments without `navigator.connection` in `useNetwork()`

packages/@mantine/hooks/src/use-network/use-network.ts

@@ -52,6 +52,10 @@ export function useNetwork() {
       setStatus({ online: _navigator.onLine, ...getConnection() });
       _navigator.connection.addEventListener('change', handleConnectionChange);
       return () => _navigator.connection.removeEventListener('change', handleConnectionChange);
+    } else if (typeof _navigator.onLine === 'boolean') {
+      // Set online status without navigator.connection information.
+      // https://caniuse.com/netinfo
+      setStatus({ online: _navigator.onLine });
     }
 
     return undefined;