Load blueprints.toml in the BlueprintPanel constructor and write it in the
destructor, matching the ship-layout blueprint lifecycle (startup load,
shutdown save, silent write errors, modal on parse failure). Removes the
Save/Load buttons and their slots. Implements REQ-UI-BLUEPRINT-SAVE/-LOAD/-PANEL.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VGNNLeFWhVzvxkK9qVXP2K