Root cause: ConsentController::grant() only passed client_id and scope
in the post-consent redirect, relying on PHP session fallback for state,
response_type, redirect_uri etc. On NC 32 (PHP 8.4), session values
were intermittently lost between session->close() and the subsequent GET
request, causing 500 errors from trim(null) / matchRedirectUri(null).
OIDC app fixes:
- Pass all OAuth params in consent redirect URL (eliminates session race)
- Add null safety guard in authorize endpoint (400 instead of 500)
Test infra fixes:
- Wait for OIDC redirect chain to settle before handling consent screen
(fixes "Execution context was destroyed" Playwright errors)
- Capture nextcloud.log in CI failure artifacts for PHP error debugging
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
