style(nmRender): 收紧旋转中心标记尺寸

- 将十字标记总长度调整为约 36px
- 将线宽调整为与网格边线一致的 1px
- 保持三轴颜色、深度偏移和交互逻辑不变
- 同步更新后处理开发清单

Src/nmNum/nmRender/nmVTKRotationCenterMarkerLayer.cpp

@@ -23,7 +23,7 @@
 
 namespace {
 
-const double ROTATION_CENTER_HALF_LENGTH_PIXELS = 24.0;
+const double ROTATION_CENTER_HALF_LENGTH_PIXELS = 18.0;
 const double ROTATION_CENTER_DEPTH_OFFSET_PIXELS = 1.5;
 const double ROTATION_CENTER_HOMOGENEOUS_EPSILON =
         std::numeric_limits<double>::epsilon();
@@ -367,7 +367,7 @@ private:
         m_pMapper->SetColorModeToDirectScalars();
 
         m_pActor->SetMapper(m_pMapper);
-        m_pActor->GetProperty()->SetLineWidth(3.0f);
+        m_pActor->GetProperty()->SetLineWidth(1.0f);
         m_pActor->GetProperty()->SetOpacity(1.0);
         m_pActor->GetProperty()->LightingOff();
         m_pActor->PickableOff();