Hand Tracking: Dots model is off position

[KooIaIa]

Basic Krabel Scene: https://krabbel.dev/p/three-laws-learn

If you use Hand Tracking Controls with dots the model is off position. It's root isn't at the root of your hand.

[mrxz]

This is a regression introduced in 874fced. Children of entities with hand-tracking-controls are now added to a "wrist object". Since the dots style is made up of individual <a-entity> elements, these get added to this wrist object as well. So the hand joints are effectively attached to the wrist of the hand they are supposed to represent.

There's a PR made by @jinglechen2287 to resolve this: #5699

Honestly I've not been a fan of the implicit adding of child entities to the wrist object. It has already caused other issues before, but most importantly it breaks the principle of least surprise by behaving different from other parent-child setups. Instead of adding a flag to exclude them as done in the PR linked above, we could consider implementing the dots directly as Three.js objects instead of <a-entity> elements. That way it side-steps the "attach to wrist" logic, while also behaving closer to how the mesh model style works.