fix: failed to modify source transform

[HardyNLee]

介绍

#832 后，在编辑器那边预览的时候，有几率卡死并触发以下错误。

cloneDeep一下似乎就好了

[gemini-code-assist]

Summary of Changes

Hello @HardyNLee, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决 #832 引入的一个关键错误，该错误导致编辑器在预览时卡死。核心问题被确定为在转换赋值过程中对源对象进行了意外修改。通过在应用转换之前对源对象进行深度克隆，此拉取请求确保了数据完整性，并防止编辑器进入不稳定状态，从而提高了预览功能的稳定性和可靠性。

Highlights

• 修复编辑器预览卡死问题: 解决了在 fix: resume alpha filter #832 之后，编辑器预览时可能出现的卡死和错误，通过深度克隆源对象来避免对原始数据进行意外修改。

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[gemini-code-assist]

Code Review

你好，这次的 Pull Request 旨在修复一个修改只读 source 对象导致的崩溃问题。通过引入 cloneDeep 来创建 source 对象的可变副本，确实解决了这个 bug。

我的主要反馈是关于性能优化的。虽然 cloneDeep 能解决问题，但它是一个资源密集型操作。在这个特定场景下，由于只修改了对象的顶层属性，使用浅拷贝（例如 { ...source }）就足够了，而且效率更高。我已经在代码中提出了具体的修改建议。这个改动可以在保证代码正确性的同时提升性能。

[gemini-code-assist]

为了解决只读属性无法修改的问题，这里使用了 cloneDeep，这虽然能解决问题，但 cloneDeep 是一个深拷贝操作，当 source 对象复杂时可能会有性能开销。分析此函数可知，我们仅修改了 source 对象的一级属性（alpha 和 alphaFilterVal），而嵌套的对象（如 scale 和 position）仅被读取。因此，使用浅拷贝就足以解决问题，并且性能会好得多。

建议使用对象展开语法 { ...source } 来进行浅拷贝。另外，由于 cloneSource 变量未被重新赋值，建议使用 const 声明。

Suggested change

	let cloneSource = cloneDeep(source);
	const cloneSource = { ...source };

[MakinoharaShoko]

assignTransform 是一个调用频繁的函数，每一帧都会调用，深拷贝可能影响性能，建议单独取出受影响的字段赋值给临时变量。

[HardyNLee]

assignTransform 是一个调用频繁的函数，每一帧都会调用，深拷贝可能影响性能，建议单独取出受影响的字段赋值给临时变量。

已修改