Adds a new 'Force ∥ to Face' toggle alongside the existing 'Force ⊥ to
Face'. The constraint direction is cross(face_normal, camera_dir), keeping
dimension vertices running along the face surface rather than into it.
Enabling one constraint automatically disables the other (mutual exclusion
via a re-entrant guard in the prop callbacks).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Ryan Schultz
99f95bee6a