feat(CopyLyrics): 选择是否在复制的每行歌词之间加入空行分隔

[MoYingJi]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @MoYingJi, 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!

此拉取请求为歌词复制功能引入了一项新特性，允许用户控制复制歌词行之间的间距。具体来说，它增加了一个选项，用于在每行复制的歌词之间包含或排除空行，从而提高了用户导出歌词时的灵活性。

Highlights

• 新增“空行”选项: 在歌词复制模态框中新增了一个“空行”复选框选项，允许用户选择是否在复制的每行歌词之间加入空行分隔。
• 默认选中“空行”: 修改了默认选中的过滤器，使其包含新添加的“emptyLine”选项，这意味着默认情况下复制的歌词会包含空行。
• 复制逻辑更新: 更新了歌词的连接逻辑，现在会根据“emptyLine”过滤器的选择，条件性地使用双换行符（“\n\n”）或单换行符（“\n”）来连接歌词。

Changelog

• src/components/Modal/CopyLyrics.vue
  • 在复制选项中添加了一个新的“空行”复选框，并附带了提示信息。
  • 更新了 selectedFilters 的默认值，使其包含“emptyLine”选项。
  • 修改了歌词连接逻辑，使其根据“emptyLine”过滤器的状态来决定使用单行或双行分隔符。

Activity

• 目前尚无人工活动（如评论或审查）。

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[gemini-code-assist]

Code Review

这个 PR 增加了一个在复制歌词时，在每行歌词之间添加空行分隔的选项，实现清晰直接。代码改动主要集中在 CopyLyrics.vue 组件中，包括添加 UI 选项、更新默认值和调整复制逻辑。

我有一个关于代码可维护性的建议，即使用常量来代替魔法字符串，以提高代码的健壮性和可读性。具体细节请参见我的评论。

[gemini-code-assist]

为了提高代码的可维护性和可读性，并避免使用魔法字符串（magic strings），建议将筛选器名称（'translation', 'romaji', 'emptyLine'）定义为常量。

例如，你可以定义一个常量对象：

const LyricCopyFilter = {
  TRANSLATION: 'translation',
  ROMAJI: 'romaji',
  EMPTY_LINE: 'emptyLine',
} as const;

然后，在整个组件中都使用这些常量，例如：

• value 属性：<n-checkbox :value="LyricCopyFilter.TRANSLATION" ... />
• selectedFilters 初始值：ref<string[]>([LyricCopyFilter.TRANSLATION, ...])
• computed 属性：selectedFilters.value.includes(LyricCopyFilter.TRANSLATION)

这样做可以使代码更健壮，防止因拼写错误导致的 bug，并且在未来需要修改筛选器名称时也更加方便。