The ship layout preview and Configure Layout button are now always shown
for a selected shipyard and disabled while no schematic is selected,
rather than being hidden. The preview shows an empty placeholder box in
that state. Update REQ-MOD-UI-PREVIEW to match.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DZR44tA8sn4dPqDzAVXyps
