fix: rename log-depth shader define and bump three to 0.183.2

[JodokGBS]

Summary

• Rename deprecated Three.js shader define USE_LOGDEPTHBUF to USE_LOGARITHMIC_DEPTH_BUFFER in src/shaders/splatVertex.glsl.
• Update three from ^0.178.0 to ^0.183.2 in package.json (devDependencies and peerDependencies).
• Refresh package-lock.json for the dependency bump.

Why

USE_LOGDEPTHBUF was renamed upstream in Three.js. This keeps Spark compatible with newer Three.js versions.

[dmarcos]

Thanks. Is this applicable to https://github.com/sparkjsdev/spark/tree/v2.0.0-preview branch?

[JodokGBS]

Thanks. Is this applicable to https://github.com/sparkjsdev/spark/tree/v2.0.0-preview branch?

No as far as i can see, this PR is not needed for v2 as it has no #ifdef USE_LOGDEPTHBUF.
It seems in v2 Spark lets Three handle log-depth internally through its shader chunks, so there’s nothing to rename in the Spark code.