[Bug] Focusing on Custom Actors

[Myterian]

Issue description:
Selecting a custom actor and focusing on them via pressing F will zoom to the Scene Origin, instead of the custom actor.

Steps to reproduce:

1. Create a custom Actor
2. Create instance in scene hierarchy
3. Select and focus

Minimal reproduction project:
Basic

Flax version:
1.8.6511.1

[mafiesto4]

Does your custom actor setup Sphere/Box property for bounds? (in C++ use _sphere/_box fields). Mayeb we need to add C# API to set those, especially during OnTransformChanged event (which could also go to C# actor types as possible to override).

[Myterian]

No, it's using c# and currently not setting _sphere or _box