✨ feat: 增加下载重试按钮，解决卡0%问题

[kazukokawagawa]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @kazukokawagawa, 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!

此拉取请求旨在通过引入一个用户友好的下载重试机制来提升用户体验，特别是针对下载过程中可能出现的卡顿或失败情况。通过在歌曲列表右键菜单中添加“重试下载”选项，并优化现有下载按钮的显示逻辑，用户现在可以更方便地管理和恢复中断的下载任务，从而有效解决“卡0%”等下载问题。

Highlights

• 新增下载重试按钮: 在歌曲列表的右键菜单中新增了一个“重试下载”按钮，用于解决下载卡顿或失败的问题。
• 下载按钮显示逻辑优化: 原有的“下载歌曲”按钮现在会在歌曲正在下载或下载失败时隐藏，以避免重复操作，并引导用户使用重试功能。
• 下载页面重试按钮调整: 移除了下载页面中重试按钮的失败状态限制，使其在任何下载中的歌曲旁都可见，方便用户操作。

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[gemini-code-assist]

Code Review

这个 PR 旨在通过增加重试按钮来解决下载卡在0%的问题，这是一个很好的功能改进。我的审查主要集中在确保重试逻辑的健壮性上，以避免不必要的重试和潜在的竞态条件。

我提出了几点建议：

1. 在 downloading.vue 中，我建议修改重试按钮的显示条件，使其仅在下载失败或进度为0时显示，而不是一直显示。这可以防止用户重试一个正在正常进行的下载。
2. 在 SongListMenu.vue 中，我建议获取更详细的下载信息（而不仅仅是一个布尔值），并同样根据下载状态（失败或进度为0）来决定是否显示“重试下载”菜单项。

这些修改将使重试功能更加精确和用户友好。

[gemini-code-assist]

仅使用一个布尔值 isDownloading 来判断状态过于宽泛。为了在菜单项中实现更精细的逻辑控制（例如，仅在下载失败或卡住时显示重试），建议获取完整的下载信息对象。

    const downloadInfo = dataStore.downloadingSongs.find((item) => item.song.id === song.id);
    const isDownloading = !!downloadInfo;

[gemini-code-assist]

“重试下载”选项应该只在下载失败或卡在0%时才可用。对一个正在正常进行的下载提供重试选项会给用户带来困惑。使用上一个建议中获取的 downloadInfo 对象，我们可以让这个显示条件更精确。

          show: downloadInfo && (downloadInfo.status === "failed" || downloadInfo.progress === 0),

[gemini-code-assist]

直接移除 v-if 会导致重试按钮在任何状态下都显示，即使用户的下载正在正常进行。这可能会引起困惑并导致不必要的操作。建议修改条件，仅在下载失败或进度为 0%（卡住）时显示重试按钮。

                  v-if="item.status === 'failed' || item.progress === 0"