When neither the LAN origin nor the mesh ULA answers the probe window,
target the mesh URL (when paired) instead of the LAN IP: off-LAN the LAN
address can never answer, and loading it showed a confusing 'can't reach
192.168.x.x' error while the mesh session was still coming up.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>