Merge origin/main into feat/external-2fa-codes. Resolve formatting
conflicts caused by biome rollout; preserve both feature streams:
PR's external 2FA token + signing-session 2FA proof additions plus
main's RateLimit/RecipientExpired/signingReminders/date-auto-insert.
In complete-document-with-token.ts, drop the duplicate early
field-fetching block introduced when main moved that logic later
with date auto-insert support; keep the EXTERNAL_TWO_FACTOR_AUTH
check using derivedRecipientActionAuth.
The prompt option was being discarded for OAuth authorize URLs after
adding support for the NEXT_PRIVATE_OIDC_PROMPT env var. This meant
select_account (used elsewhere) was not being passed through.
Now defaults prompt to the provided option (or 'login'), and only
overwrites it when a valid OIDC prompt env var is set. Also adds a
type guard to validate the env var value.
Use the `select_account` prompt for SSO OIDC to avoid constantly asking
for credentials to be entered with a client has an existing session with
the SSO provider.
ephraimduncan
Lucas Smith
Karlo
David Nguyen