fix: ensure live2d blink focus in state is full

[HardyNLee]

介绍

修复 stage state 中 live2dBlink 和 live2dFocus 参数可能不完整的问题

测试

changeFigure: path/to/model.json -id=aaa -focus={"x":-1} -next;
:focus left;
changeFigure: path/to/model.json -id=aaa -focus={"y":1} -next;
:focus left up (继承上一句的 left);

此 PR 前, 播放到最后一句, 再读档读到第一句, 并不会真的 focus left, 因为那时 focus 参数在 state 中不完整

[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 stage state 中 Live2D 眨眼和焦点参数可能不完整的问题。通过引入基础参数并在更新或添加这些状态时进行合并，它确保了 Live2D 模型在不同场景（例如加载存档或状态切换）下能够正确地应用其眨眼和焦点设置，从而避免了因参数缺失导致的显示异常或行为不一致。

Highlights

• 引入基础参数: 引入了 baseBlinkParam 和 baseFocusParam，它们作为 Live2D 眨眼和焦点参数的默认值，用于确保状态的完整性。
• Live2D 眨眼状态处理: 修改了 setLive2dBlink reducer 的逻辑，在添加新的眨眼状态或更新现有状态时，通过将传入的参数与 baseBlinkParam 或当前状态合并，确保 Live2D 眨眼参数始终是完整的。
• Live2D 焦点状态处理: 修改了 setLive2dFocus reducer 的逻辑，在添加新的焦点状态或更新现有状态时，通过将传入的参数与 baseFocusParam 或当前状态合并，确保 Live2D 焦点参数始终是完整的。

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[gemini-code-assist]

Code Review

你好，感谢你对这个问题的修复。通过合并基础参数和传入的部分参数，你确保了 live2dBlink 和 live2dFocus 在 state 中始终是完整的，这有效地解决了所描述的 bug。

代码的逻辑是正确的。我只发现了一个可以改进的地方，即 setLive2dBlink 和 setLive2dFocus 两个 reducer 中存在重复的逻辑。我已经在代码中提出了一个具体的建议，旨在通过重构来提高代码的可维护性。

总体来说，这是一个很好的修复！

[gemini-code-assist]

这部分用于添加或更新 live2dBlink 的逻辑与 setLive2dFocus reducer (291-299行) 中的逻辑几乎完全相同。

为了提高代码的可维护性并遵循 DRY (Don't Repeat Yourself) 原则，建议将此通用逻辑提取到一个可重用的辅助函数中。这样，如果未来需要修改此逻辑，只需在一个地方进行更改。

虽然当前实现是正确的，但进行此重构将使代码库更整洁。