fix: 修复 exitDuration 未正常生效的问题(close #852)

[ChangeSuger]

#852

之前 #827 的改动没考虑到还有单独设置 exitDuration 的情况，导致 exitDuration 不生效，修复一下这个问题。

测试用例：

changeBg:bg.webp -duration=5000 -exitDuration=5000 -next;
:背景入场 5000;
changeFigure:stand.webp -id=aaa -duration=5000 -exitDuration=5000 -next;
:立绘入场 5000;
changeFigure:none -id=aaa -next;
:立绘退场 exitDuration 5000;
changeBg:none -next;
:背景退场 exitDuration 5000;

[gemini-code-assist]

Summary of Changes

Hello @ChangeSuger, 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一个关键的动画时长设置问题，即 exitDuration 在特定情况下未能生效。通过重构动画设置的获取和处理逻辑，并修正了 stageReducer 中移除动画设置的条件，确保了无论是否指定了自定义退出动画名称，exitDuration 都能被正确识别和应用，从而提升了动画行为的准确性和可控性。

Highlights

• 修复 exitDuration 未生效问题: 解决了在特定情况下，exitDuration 动画时长设置未能正确生效的问题，确保动画退出行为符合预期。
• 优化动画设置获取逻辑: 重构了 getEnterExitAnimation 函数中动画设置的获取方式，引入 animationSettings 变量统一管理，提高了代码的可读性和健壮性。
• 调整 stageReducer 移除条件: 修改了 stageReducer 中移除动画设置的条件，使其在 exitDuration 被明确定义时也能保留相关的 -off 设置，从而正确应用退出时长。

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[gemini-code-assist]

Code Review

这次的改动很好地解决了 exitDuration 未生效的问题。通过在 animationFunctions.ts 中缓存 animationSettings，避免了重复的查询，提升了代码的可读性和效率。同时，确保了在获取动画设置后正确地将其移除。在 stageReducer.ts 中对 exitDuration 的判断逻辑也修正得很正确。整体来看，这是一个高质量的修复，没有发现其他问题。