​Giant Coastal Crab (New mountable mob)

My idea is to add a new mob that is the Giant Coastal Crab, horse-sized, perfect for helping with exploration and building. You tame it by feeding it raw fish, and to ride it, you craft a Crab Saddle using a regular saddle and kelp on a workbench. It spawns on beaches in pastel colors like moss green, light pink, yellow, and light red, plus orange and rare two-color variants. In water it swims super fast like a dolphin, and on land it walks at normal player speed. The coolest part is that while mounted, it can freely walk on walls and ceilings, making it ideal for building in high places. It has 50 hearts of health, takes zero fall damage, and stops at edges so it won't fall off by itself. While riding it, you cannot use your own weapons, but you can click to control the crab's claws to strike monsters for 6 damage.