VECTOR HUD

Fix: on 26.2 the 3D holo map and the ore scan never actually ran. A sentinel value was being used inside a subtraction, which overflowed and left the scan gate permanently shut, so both features were silently dead from the first 26.2 release - no error, no log line, just nothing drawn. Both work now, and the scan reports its own failures instead of dying quietly. Also included: the monocle theme no longer hides the holo map.