cmd: delete ship type

pkg/error/state.go

@@ -3,3 +3,11 @@ package error
 func NewGameStateError(arg ...any) error {
 	return newGenericError(ErrGameStateInvalid, arg...)
 }
+
+func NewDeleteShipTypeExistingGroupError(arg ...any) error {
+	return newGenericError(ErrDeleteShipTypeExistingGroup, arg...)
+}
+
+func NewDeleteShipTypePlanetProductionError(arg ...any) error {
+	return newGenericError(ErrDeleteShipTypePlanetProduction, arg...)
+}