* feat(#534): add OAuth provider management screen + credential_warning surfacing * style(#534): fix ktlint import-ordering in ProvidersViewModel * fix(#534): address agy review — terminal DONE/ERROR dialog states + PKCE browser launch * fix(#534): add Done/Close dialog strings * fix(#534): address agy review - terminal DONE/ERROR dialog states, real PKCE browser launch, clear flow state --------- Co-authored-by: M57 <m57@hermes-control.app>