Unified Photon–Electron Interactions in USP Field Theory

This is the refined and complete version of the USP Field Theory explanation on transparency, reflection, and color. It unifies photon–electron interactions under spin tension logic, revealing why some materials are transparent, others reflect light, and some absorb it as heat. Real-world examples such as copper vs. glass, and carbon vs. diamond are included, along with a new final section on how even opaque materials like copper can transmit photons when cut extremely thin.🛑 Version 1 is now obsolete and should not be referenced — this v3 includes critical conceptual clarifications and structural refinements.