The value types and compose helpers in Federation.h were already Qt-free —
Eigen and std::string — but sat in the Qt half of the viewer, so the web build
could not reach them. Split them into FederationMath and add it to
IfcViewerCore, which the Emscripten build links.
What stays behind is what genuinely needs the dependencies: computeModelGeoref
reads an ifcopenshell::file, and the Federation class is a QObject that
persists .ifcfed. Federation.h includes the new header, so no caller changes.
FederationMath needs convert() to resolve a federation unit name to metres and
x_axis_to_angle_deg() to read grid north off a coordinate operation, hence the
helpers_math dependency added in the previous commit.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Dion Moult