Aeronautics:Gravity Visualization

New feature "Extendo Grip Vehicle Grab": right-click a rope connector on a physics vehicle while holding an Extendo Grip to toggle dragging it around. The vehicle locks horizontally to your view, scroll adjusts distance, and Tab + mouse fine-tunes its orientation; survival mode consumes durability, backtank air, and hunger, and you can't grab a vehicle you're standing on. Includes two hidden advancements ("Survival Physics Staff" and "Mighty Strong") plus a new "Gameplay Tunables" config page for adjusting costs and drag softness.