fix: timeline animation error

[HardyNLee]

介绍

修复 timeline 动画仅有一段, 但 duration 不为 0 时, 此后所有动画都失效的问题

fix #808

测试

changeBg:bg.webp;
changeFigure:stand.webp -id=aaa;
; 执行下面这一句后, 所有动画失效
setTempAnimation:[{"duration":1000,"position":{"x":-300}}] -target=aaa;
setTransform:{"position":{"x":300}} -duration=1000 -target=aaa;

[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时间轴动画系统中的一个错误。此前，如果一个动画仅包含一个片段但设置了非零持续时间，会导致后续所有动画无法正常执行。本次修复通过在创建动画实例前增加对时间轴长度的检查，确保只有在存在多个动画关键帧时才初始化 popmotion 动画，从而避免了这种意外的行为，提高了动画系统的稳定性。

Highlights

• 动画失效修复: 修复了时间轴动画的一个关键问题，即当只有一个动画片段但持续时间不为零时，后续所有动画都会失效。
• 条件逻辑优化: 通过修改 generateTimelineObj 函数中的条件，确保 popmotion.animate 实例仅在动画持续时间大于0且时间轴长度大于1时才被创建。

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Changelog

• packages/webgal/src/Core/controller/stage/pixi/animations/timeline.ts
  • 修改了 generateTimelineObj 函数中 popmotion.animate 实例的创建条件，增加了 timeline.length > 1 的判断。

Activity

• 拉取请求由 HardyNLee 创建。
• 拉取请求描述详细说明了问题背景、修复内容以及复现步骤，并关联了 多个setTempAnimation会导致动画缓动不生效 #808。
• 目前没有其他评审或评论活动。

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[gemini-code-assist]

Code Review

你好！这次的 Pull Request 很好地修复了当时间轴动画只有一个关键帧且持续时间不为零时，导致后续动画失效的严重问题。你通过增加 timeline.length > 1 的检查，精准地定位并解决了问题根源，避免了为单一关键帧创建无效动画。这个修复逻辑清晰，代码简洁。我还发现一个相关的边界情况，并已在代码中提出了具体的改进建议，希望能帮助代码更加健壮。

[gemini-code-assist]

这个条件很好地解决了只有一个关键帧时创建动画的问题。然而，我注意到一个相关的边界情况：当 timeline 数组为空时，此函数将在第 64 行因试图解构 undefined 而崩溃。虽然这可能超出了本次修复的范围，但为了增强函数的健壮性，建议在函数开头添加一个检查来处理空时间轴的情况，例如：

if (timeline.length === 0) {
  // 返回一个无操作的动画对象或直接返回
  return {
    setStartState: () => {},
    setEndState: () => {},
    tickerFunc: () => {},
    getEndStateEffect: () => ({}),
    forceStopWithoutSetEndState: () => {},
  };
}