Redesigned dropped item physics and grouping for zero-lag high-yield mining.

Engine-level subsystems engineered for zero-allocation performance and sandbox player agency.
Groups nearby dropped items into unified single entities across larger radii.
Massively reduces server tick lag and client render overhead in quarry zones.
Displays clear, unobtrusive item stack count badges above clumped entities.
Fully configurable merge distance, despawn timers, and entity caps.