Change ZM_OPT_USE_REMEMBER_ME from a boolean to a tri-state string:
- None: checkbox hidden, sessions persist for ZM_COOKIE_LIFETIME (old disabled)
- Yes: checkbox shown and pre-checked by default
- No: checkbox shown and unchecked by default (old enabled behavior)
Update ConfigData.pm.in with new type definition, login.php to honor the
checked state, and session/action handlers to recognize the new values.
Migration in zm_update-1.39.4.sql maps old '1' to 'No' and '0' to 'None'.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>