fix: Correct 2D axis label Y-position and set color to white

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/ViewCube.cpp

@@ -87,7 +87,7 @@ void ViewCube::paintGL(QOpenGLShaderProgram* simpleShader, int simpleShaderColor
     QVector3D zAxisNdc = mvp.map(zAxisEnd);
 
     const int vpX = width - viewCubeSize;
-    const int vpY = height - viewCubeSize;
+    const int vpY = 0;
     const int vpW = viewCubeSize;
     const int vpH = viewCubeSize;
     const float dpr = QGuiApplication::primaryScreen()->devicePixelRatio();
@@ -261,7 +261,7 @@ void ViewCube::paint2D(QPainter& painter, int widgetWidth, int widgetHeight)
 {
     QFont font("Arial", 10, QFont::Bold);
     painter.setFont(font);
-    painter.setPen(Qt::black);
+    painter.setPen(Qt::white);
     QFontMetrics fm(font);
 
     QRect xRect = fm.boundingRect("X");