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

src/Core/FontConfig.h

@@ -0,0 +1,48 @@
+#ifndef U_CORE_FONTCONFIG_H
+#define U_CORE_FONTCONFIG_H
+
+#include <string>
+#include <ostream>
+#include <boost/serialization/nvp.hpp>
+
+namespace uLib {
+
+/**
+ * @struct FontConfig
+ * @brief Basic font configuration for text properties.
+ */
+struct FontConfig {
+    std::string family;
+    int size;
+    bool bold;
+    bool italic;
+
+    FontConfig() : family("Arial"), size(10), bold(false), italic(false) {}
+    FontConfig(const std::string& fam, int sz, bool b = false, bool i = false)
+        : family(fam), size(sz), bold(b), italic(i) {}
+
+    bool operator==(const FontConfig& other) const {
+        return family == other.family && size == other.size && 
+               bold == other.bold && italic == other.italic;
+    }
+    bool operator!=(const FontConfig& other) const { return !(*this == other); }
+
+    template<class Archive>
+    void serialize(Archive& ar, const unsigned int version) {
+        ar & boost::serialization::make_nvp("family", family);
+        ar & boost::serialization::make_nvp("size", size);
+        ar & boost::serialization::make_nvp("bold", bold);
+        ar & boost::serialization::make_nvp("italic", italic);
+    }
+};
+
+inline std::ostream& operator<<(std::ostream& os, const FontConfig& f) {
+    os << f.family << " " << f.size;
+    if (f.bold) os << " Bold";
+    if (f.italic) os << " Italic";
+    return os;
+}
+
+} // namespace uLib
+
+#endif // U_CORE_FONTCONFIG_H