A clearer Management keys page

Team → Management keys now shows at a glance what every key can do, what needs the Team Directives permission and what no key can reach. New key opens a dialog with the expiry, the permission as a switch and the endpoints the key will reach; the secret appears once with ready-to-paste .env, GitHub Actions and test snippets. Keys sit under Active and Revoked and expired tabs, each with a bar of its lifetime left that turns amber in its last two weeks, and rotating explains each overlap.