Merge pull request #1332 from ramox81/codex/concentric-constraint-parity

# Conflicts:
#	src/entities/arc.rs
#	src/entities/ellipse.rs
#	src/modules/parametric/mod.rs
#	src/scene/parametric_solve.rs
#	src/ui/overlay.rs

src/modules/parametric/geom_constraint.rs

@@ -21,7 +21,7 @@ impl GeomConstraintCommand {
             "T" | "TANGENT" => "TCONSTRAINT",
             "SM" | "SMOOTH" => "GCSMOOTH",
             "C" | "COINCIDENT" => "GCCOINCIDENT",
-            "CON" | "CONCENTRIC" => "NCONSTRAINT",
+            "CON" | "CONCENTRIC" => "GCCONCENTRIC",
             "COL" | "COLLINEAR" | "COLINEAR" => "LCONSTRAINT",
             "SY" | "SYMMETRIC" => "SYCONSTRAINT",
             "E" | "EQUAL" => "ECONSTRAINT",