Big day. Added a ship delivery job system — ships can now be assigned jobs to haul resources between asteroids. Moved the ship build button into the factory HUD for a cleaner flow.

Implemented Firebase authentication and cloud saves so game state persists across devices. Fixed several persistence bugs: landing pad reservations lost on reload, landed ship renderers not recreated, buildings lost on cross-machine save/load, and thrust disappearing on return leg transitions.

Migrated the UI from custom styles to Tailwind + Base UI, then further to MUI with the Exo 2 font. Added a curl-able world dump endpoint for inspecting game state from the terminal. The HUD now shows load progress, and the dump output includes resource buffers and ship jobs.