feat: implement configurable font settings for VTK viewports and GUI elements with persistent preferences.

src/Vtk/vtkViewport.h

@@ -4,6 +4,8 @@
 #include "uLibVtkInterface.h"
 #include <vector>
 #include <map>
+#include "Core/FontConfig.h"
+#include "Math/Dense.h"
 
 namespace uLib { class Object; }
 
@@ -83,6 +85,12 @@ public:
     void SetParallelProjection(bool parallel);
     bool GetParallelProjection() const;
 
+    // Font configuration
+    void SetFont(const FontConfig& font);
+    FontConfig GetFont() const;
+    void SetFontColor(const Vector3d& color);
+    Vector3d GetFontColor() const;
+
 protected:
     void SetupPipeline(vtkRenderWindowInteractor* iren);