fix(SongMenu): 「下一首播放」的显示未按预期

[MoYingJi]

index 应该是歌曲在歌曲列表中的，而不是播放列表中的，这里却用这个 index 去和播放列表里的 playIndex 比较，是完全错误的

[gemini-code-assist]

Summary of Changes

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此拉取请求旨在修复歌曲菜单中「下一首播放」显示不准确的问题。此前，判断当前播放歌曲的逻辑存在缺陷，错误地将歌曲列表的索引与播放列表的索引进行比较。本次更改引入了一个新的辅助函数来准确比较歌曲对象，并更新了菜单的判断逻辑，从而确保了当前播放歌曲的正确识别和显示。

Highlights

• 新增歌曲比较函数: 添加了 isSameSong 辅助函数，用于根据歌曲的 id 或 path 准确判断两首歌曲是否相同。
• 修复当前播放歌曲判断逻辑: 修正了歌曲菜单中判断当前播放歌曲的逻辑，从错误的基于索引的比较改为使用新 isSameSong 函数进行基于歌曲对象的比较。
• 解决「下一首播放」显示问题: 解决了「下一首播放」显示不符合预期的问题，确保了歌曲菜单能正确识别当前播放的歌曲。

Changelog

• src/composables/useSongMenu.ts
  • 新增了 isSameSong 函数，用于比较两首歌曲是否相同。
  • 更新了 isCurrent 变量的计算方式，使其使用 isSameSong 函数来判断当前播放歌曲。

Activity

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[gemini-code-assist]

Code Review

这个 PR 修复了「下一首播放」菜单项的显示逻辑，旧的实现通过比较列表索引来判断，但这在不同列表下会出错，做得很好。新的实现直接比较歌曲对象，这更加健壮。不过，我在新的 isSameSong 辅助函数中发现一个潜在问题，它无法正确处理 ID 为 0 的歌曲。我留了一条建议来修复这个问题。

[Copilot]

Pull request overview

修复歌曲菜单中「下一首播放」的显示逻辑：不再用歌曲列表的 index 去和播放列表的 playIndex 比较，改为基于“当前播放歌曲”与“目标歌曲”是否为同一首来判断，从而避免显示不符合预期。

Changes:

• 新增 isSameSong 辅助方法，用 id / path 判断两首歌是否相同
• isCurrent 判断从索引比较改为歌曲实体比较，影响「下一首播放」等菜单项的显示条件

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