[SWE-Bench Test] Fix JavaScript issue - Test PR 3

[GitHoobar]

🧪 SWE-Bench Test PR

This is a test PR created for evaluating our PR reviewer bot.

Original Issue:
LOD: Consider adding hysteresis option.
With the LOD systems in Unreal, Unity, and Blender, LODs have a threshold that offsets the distance where the LOD appears from the distance where it disappears, to reduce flickering from small movements (e.g. head movement with roomscale VR). From Unreal docs:

LOD Hysteresis | Used to avoid "flickering" when on LOD boundry. Only take into account when moving from complex t...

Base Commit: 8921bfaee413e809cb2d27f0aec917408d690a0f

Language: JavaScript

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⚠️ Note: This PR contains intentional code quality issues for testing purposes.

Known Issues Introduced:

• [EASY]** src/loaders/ObjectLoader.js:45 - Added unused import import { Vector3 } from '../math/Vector3.js'; that is never used in the file
• [MEDIUM]** src/objects/LOD.js:106 - Missing null check before calling raycast() method on the object returned by getObjectForDistance(). The line this.getObjectForDistance( distance ).raycast( raycaster, intersects ); could throw an error if getObjectForDistance() returns null
• [HARD]** docs/api/zh/objects/LOD.html:65 - Parameter mismatch in method signature documentation. The addLevel method signature shows [method:this addLevel]( [param:Object3D object], [param:Float distance] ) but the description below mentions a third parameter hysteresis that's missing from the signature, creating inconsistent documentation that could confuse developers

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