This PR implements a feature enhancement to display a login popup when the session expires. Key changes include updating flag handling and client construction to support a new login URL popup, revising login and notification handling logic to use the new popup, and updating status and server-side session state management accordingly.
* [client] Enhance exit node menu functionality with deselect all option
* Hide exit nodes before removal in recreateExitNodeMenu
* recreateExitNodeMenu adding mutex locks
* Refetch exit nodes after deselecting all in exit node menu
