refactor(cad): use direct stack dependencies

src/modules/draw/inquiry/area.rs

@@ -1,4 +1,4 @@
-use acadrust::kernel::space::polygon;
+use cadkernel::space::polygon;
 use acadrust::{EntityType, Handle};
 use glam::DVec3;
 

src/modules/draw/inquiry/divide.rs

@@ -2,7 +2,7 @@
 // MEASURE command — place Point entities at fixed-distance intervals along an entity.
 
 use acadrust::entities::Point as PointEnt;
-use acadrust::kernel::space::PlanarCurve;
+use cadkernel::space::PlanarCurve;
 use acadrust::types::Vector3;
 use acadrust::{EntityType, Handle};
 use glam::DVec3;