The overflow check for auto-offsetting imported graphics did not account
for the IU conversion factor, causing DXF files with coordinates around
2300mm to exhibit visual glitches. The check compared mm values directly
against INT32_MAX, but after IU conversion (multiply by 1e6 for PCB),
these values exceed the integer limit.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/9681
Seth Hillbrand