The LAN-IP rewrite in _getShareBaseUrl() exists to fix unusable
127.0.0.1 links; applying it to every origin meant links copied behind
a reverse proxy pointed at http://<LAN-IP>:5100, bypassing TLS. HTTPS
and non-localhost origins are now used as-is.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>