Four bugs slipped through per-task review since each task only saw its
own diff:
- Logout was a plain <a href> GET against a POST-only backend route, so
it 405'd and never cleared the session cookie or hit Keycloak's
end-session redirect. Now a <form method="post"> with a submit button
styled to match the old link (still a real full-page navigation, not
a fetch, so the Keycloak redirect chain still works).
- Login/logout used origin-relative paths, unreachable from the Vite
dev server (:5173) against the backend (:8080) with no proxy
configured. Both now build their URL from client.ts's now-exported
BASE_URL.
- handleSessionCallback's four failure paths redirected to
/?auth_error=failed with no logging, making a real OIDC failure
undiagnosable in production. Added log.Printf on each failure site.
- handleSessionLogout passed a bare "/" to EndSessionURL; Keycloak
requires post_logout_redirect_uri to be an absolute, registered URL.
Added SessionConfig.PublicBaseURL, wired from cfg.PublicBaseURL in
main.go, and used to build an absolute redirect.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
