Right after install the dashboard SPA opens and, if it loads before NetBird's
embedded OIDC provider is serving, caches a bad auth state — the user appears
logged-in but can't log out until it self-corrects. Container "running" != OIDC
ready, so gate the install's Done phase on the management server's
/oauth2/.well-known/openid-configuration answering (best-effort, 60s cap, never
fails the install since the stack is already up).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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