[SWE-Bench Test] Fix JavaScript issue - Test PR 4

[GitHoobar]

🧪 SWE-Bench Test PR

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

Original Issue:
box3.intersectsPlane bug
In the following example, the plane obviously intersects with the box, but the function intersectsPlane returns false.
example
I find that adding two negative sign before both of the plane.constant can fix the bug.
https://github.com/mrdoob/three.js/blob/c570b9bd95cf94829715b2cd3a8b128e37768a9c/src/math/Box3.js#L387
Also, I think the definition of the constant of the plane is not distinct, which cause the bug.

Three.js ver...

Base Commit: c570b9bd95cf94829715b2cd3a8b128e37768a9c

Language: JavaScript

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

Known Issues Introduced:

• [EASY]** Line 3 - Added unused import import { Matrix4 } from './Matrix4.js'; that is never referenced in the code
• [MEDIUM]** Line 137 - Removed null/undefined check for target parameter in getCenter() function. The original code had a safety check if ( target === undefined ) with a warning and fallback, but now it will crash if target is undefined
• [MEDIUM]** Line 89 - Missing input validation in setFromPoints() function. Removed implicit check for empty/null points array - if points is null/undefined, the function will crash when trying to access .length
• [HARD]** Line 230 - Replaced hardcoded multiplier 0.5 with direct literal in setFromCenterAndSize(). The original used a clear constant, but now uses a magic number that reduces code maintainability
• [HARD]** Line 387 - Missing null check in getParameter() function. While there's a target check, there's no validation that point parameter exists before accessing point.x, point.y, point.z properties, which could cause runtime errors if point is null/undefined

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