Every vehicle has a GPS tracker (X3/GT06E/AT4) and a JC400P dashcam sharing the
same plate. dedupeLiveFeatures() collapses the pair to one device per normalised
plate: functioning (<24h) beats offline → tracker beats camera → freshest fix.
So a vehicle shows once — tracker by default, camera only when the tracker is
dark. Dropdown + live filter also dedup by normalised plate (merges stray-space
variants like 'KDS 453 Y' vs 'KDS 453Y'). Unit-verified all precedence cases.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
