feat(nmRender): 放大旋转中心标记与方向轴

- 将旋转中心标记总长度调整为约 48px，线宽调整为 3px
- 将方向轴默认视口跨度调整为 20.5%
- 保持原有拾取、相机和生命周期逻辑不变

Src/nmNum/nmRender/nmVTKOrientationMarkerController.cpp

@@ -65,8 +65,8 @@ nmVTKOrientationMarkerController::nmVTKOrientationMarkerController()
 
     m_dViewport[0] = 0.015;
     m_dViewport[1] = 0.015;
-    m_dViewport[2] = 0.13;
-    m_dViewport[3] = 0.13;
+    m_dViewport[2] = 0.22;
+    m_dViewport[3] = 0.22;
 
     if(m_pAxesActor != nullptr) {
         m_pAxesActor->SetXAxisLabelText("X");

Src/nmNum/nmRender/nmVTKRotationCenterMarkerLayer.cpp

@@ -23,7 +23,7 @@
 
 namespace {
 
-const double ROTATION_CENTER_HALF_LENGTH_PIXELS = 18.0;
+const double ROTATION_CENTER_HALF_LENGTH_PIXELS = 24.0;
 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(2.0f);
+        m_pActor->GetProperty()->SetLineWidth(3.0f);
         m_pActor->GetProperty()->SetOpacity(1.0);
         m_pActor->GetProperty()->LightingOff();
         m_pActor->PickableOff();