Smooth and Cut Sandstone Are Missing Stairs and Walls

Currently, sandstone has a full set of building variants such as stairs, slabs, and walls. However, Smooth Sandstone and Cut Sandstone are missing stairs and walls, which breaks consistency with other block families.
Adding these variants would improve building options, align sandstone with other materials that have complete block sets, and provide more creative flexibility for builders. This would be a great addition to the game.