fix: 添加组件卸载后的清理逻辑

[benym]

在PixelBlast组件中，增加了对threeRef的检查以避免在已dispose的renderer上调用render。同时，确保在组件卸载时清空threeRef以防止未取消的requestAnimationFrame执行时使用已dispose的对象。

Rpamis-Security Version

[The version of Rpamis-Security you are working on, e.g. 1.1.0, check your pom.xml dependency version]

Description

[Please describe the background, purpose, changes made, and how to test this PR]

Checklist

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• Code has been formatted with mvn spring-javaformat:apply
• All tests are passing (mvn test)
• Javadoc comments are complete and follow project conventions
• Related documentation has been updated (e.g. links, examples, etc.)
• Code is ready for review

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Summary of Changes

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此拉取请求解决了 PixelBlast 组件在卸载过程中可能出现的资源管理问题。它引入了检查和清理逻辑，以防止组件卸载时发生错误，特别是通过确保渲染操作不会在已释放的 Three.js 渲染器上执行，并且 requestAnimationFrame 回调不会访问已置空的引用。

Highlights

• 渲染器安全: 在 animate 函数中增加了对 threeRef 的检查，以避免在已释放的渲染器上调用 render。
• 组件卸载清理: 确保在组件卸载时清空 threeRef，以防止未取消的 requestAnimationFrame 在执行时使用已释放的对象。

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Changelog

• docs/rpamis-security-docs/src/components/PixelBlast.jsx
  • 在 animate 函数中添加了对 threeRef.current 的空值检查。
  • 将 threeRef.current = null 的赋值提前到清理函数中。
  • 移除了一个冗余的 threeRef.current = null 赋值。

Activity

• 目前没有记录到任何活动（例如评论、审查或进度更新）。

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Code Review

The pull request refactors the cleanup logic for a React component using a rendering library to prevent errors during component unmount. It introduces an early nullification of the threeRef.current object within the cleanup function and adds a guard clause to the animate function to prevent rendering operations on an already disposed or nullified renderer, thereby enhancing the component's stability during unmounting.