The session cookie has no Max-Age, so it is lost when the browser closes. The password flow compensates via a "Remember me" checkbox issuing an LTA cookie; OAuth2/OIDC sign-in had no such UI.
Issuing a regular LTA cookie after an OAuth callback would skip the IdP for LOGIN_REMEMBER_DAYS. Instead, this introduces a separate LongTermAuthorizationSSO purpose: the cookie is opt-in via the existing "Remember me" checkbox, and when presented without a session, autoSignIn redirects through the IdP with OIDC prompt=none for silent re-auth. On login_required / interaction_required / consent_required / account_selection_required
we transparently fall back to interactive sign-in.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12321
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
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