feat: add blend mode argument

[HardyNLee]

介绍

支持立绘混合模式参数, 包括

• 图形编辑器-切换立绘
• 脚本编辑器-代码补全

Note

应在 OpenWebGAL/WebGAL#844 合并后, 再合并此 PR

[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!

此拉取请求引入了对立绘混合模式参数的支持，增强了图形和脚本编辑器中角色精灵的视觉控制能力。通过添加 blendMode 参数，用户现在可以指定立绘如何与背景或其他元素进行混合，从而实现更丰富的视觉效果。此功能已无缝集成到图形编辑器的用户界面中，并通过脚本编辑器的代码补全功能提供支持。

Highlights

• 新增混合模式参数: 为立绘（changeFigure 命令）添加了新的 blendMode 参数，允许用户控制立绘的混合方式。
• 图形编辑器支持: 在图形编辑器中，切换立绘功能现在包含一个下拉菜单，用于选择混合模式，包括“正常”、“线性减淡”、“正片叠底”和“滤色”。
• 脚本编辑器代码补全: 脚本编辑器现在为 changeFigure 命令的 blendMode 参数提供代码补全和文档，方便开发者使用。
• 国际化更新: 更新了英文、日文和简体中文的本地化文件，以包含新的混合模式选项和文件名验证消息的翻译。

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[gemini-code-assist]

Code Review

本次 PR 新增了立绘的混合模式（blend mode）参数，并更新了图形编辑器和脚本编辑器的代码补全功能以支持此参数。代码实现清晰，功能添加完整。我发现了一些小问题，主要集中在本地化文件和代码文档中，具体请看我的评论。修复这些问题后，代码就更完善了。

[gemini-code-assist]

这里新增的英文本地化条目 msgstr 为空，需要添加对应的翻译。建议翻译为：Filename cannot contain special characters: '/\:*?"<>|'

msgstr "Filename cannot contain special characters: '/\\:*?\"<>|'"

[gemini-code-assist]

这里新增的日文本地化条目 msgstr 为空，需要添加对应的翻译。建议翻译为：ファイル名に特殊文字を含めることはできません: '/\:*?"<>|'

msgstr "ファイル名に特殊文字を含めることはできません: '/\\:*?\"<>|'"