Add invisible functional interaction blocks for custom furniture.

Since Bloxburg holds many players who build custom furniture, the catalog is limited, but it ends up with these creations being decorative and unusable.

So, I'm suggesting placeable interaction blocks where the player can sit, sleep, lie down, etc. in Build Mode. These would be visible while building, but invisible in live mode with their proper function. Plus, they should be transformable to enable more opportunities.