Shared numeric thresholds for the worker projection dispatchers.
These constants were previously inlined (and duplicated) across the
worker dispatchers and the now-deleted main-thread projection copies.
Centralizing them here gives the worker (and the in-process dispatcher
the main thread runs as its fallback) a single source of truth, so a
threshold can't silently drift between the GSplats and Lines paths.
Shared numeric thresholds for the worker projection dispatchers.
These constants were previously inlined (and duplicated) across the worker dispatchers and the now-deleted main-thread projection copies. Centralizing them here gives the worker (and the in-process dispatcher the main thread runs as its fallback) a single source of truth, so a threshold can't silently drift between the GSplats and Lines paths.