RAYX-UI crashes when trying to open element editor

[Atraxus]

When clicking on an element in the tree view the application crashes. Broken from last rework most likely

[Atraxus]

The issue stems from code duplication between the ValueType enum and the std::variant m_variant. Commit cd97271 addresses this by adding the missing types to the ValueType array used in the type() function. However, this is only a temporary fix. A more robust solution is needed to ensure that adding a new type to the variant does not break the application.