Replace the Save/Load buttons in the factory-building blueprint panel with automatic persistence: save on shutdown, load at startup. REQ-UI-BLUEPRINT-SAVE, -LOAD, and -PANEL now match the ship-layout blueprint rules (REQ-MOD-UI-BLUEPRINT- STARTUP/SHUTDOWN). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VGNNLeFWhVzvxkK9qVXP2K