Function fixNormal

fixNormal(
    v0: Vec3,
    v1: Vec3,
    v2: Vec3,
    triangleNormal: Vec3,
    activeEdges: number,
    point: Vec3,
    normal: Vec3,
    movementDirection: Vec3,
): Vec3
Replace collision normal with triangle normal when hitting an inactive edge.

Prevents "ghost collisions" at interior triangle mesh edges by detecting when a collision point lies on or near an inactive edge, and returning the triangle normal instead of the calculated collision normal.
Parameters
- v0: Vec3
  first triangle vertex (local space)
- v1: Vec3
  second triangle vertex (local space)
- v2: Vec3
  third triangle vertex (local space)
- triangleNormal: Vec3
  triangle normal (unnormalized OK)
- activeEdges: number
  3-bit mask: bit 0 = edge v0-v1, bit 1 = edge v1-v2, bit 2 = edge v2-v0
- point: Vec3
  collision point on triangle (local space)
- normal: Vec3
  collision normal from GJK/EPA (unnormalized OK)
- movementDirection: Vec3
  velocity hint for resolving ambiguous cases (can be zero)
Returns Vec3
corrected collision normal (returns input normal or triangle normal)
- Defined in src/collision/active-edges.ts:74