Revoking a connected agent no longer signs you out of the web app

Revoking a connected agent from Settings → Agent used to also end your own signed-in session in the web app, because the agent and your browser session were linked together behind the scenes. Newly connected agents now get their own independent session, so revoking one only disconnects the agent — you stay signed in. Agents connected before this fix are also covered: revoking them now leaves your web session untouched while still cutting off the agent's access immediately.