style(MainAMLyric): 优化歌词滚动位置靠近顶部时的样式

[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!

此拉取请求旨在优化歌词组件的显示样式，特别是当歌词配置为在播放器顶部附近滚动时。它调整了活动歌词行的垂直定位，并引入了一个明确的对齐锚点，以改善视觉体验并确保顶部对齐歌词的一致行为。

Highlights

• 优化歌词滚动位置: 当歌词滚动位置不居中时，将当前播放歌词的对齐位置从0.2调整到0.15，使其更靠近顶部显示。
• 新增对齐锚点属性: 引入了一个新的alignAnchor属性，用于明确指定歌词滚动的对齐锚点。当歌词滚动位置居中时，锚点为'center'；否则为'top'。

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[gemini-code-assist]

Code Review

本次 PR 优化了歌词滚动到顶部时的样式，通过调整 alignPosition 和新增 alignAnchor 属性，使得歌词在靠近顶部时显示效果更好。

代码改动很直接，主要是对 LyricPlayer 组件的属性进行了微调。我有一个关于代码可读性和减少重复代码的建议，请查看具体的审查评论。总体来说，这是一个不错的优化。

[gemini-code-assist]

为了提高代码的可读性和可维护性，可以考虑将重复的条件 settingStore.lyricsScrollPosition === 'center' 提取到一个计算属性中。

例如，在 <script setup> 部分添加：

const isCenterAligned = computed(() => settingStore.lyricsScrollPosition === 'center');

然后在模板中可以这样使用：

:alignPosition="isCenterAligned ? 0.5 : 0.15"
:alignAnchor="isCenterAligned ? 'center' : 'top'"

这样做可以避免在模板中重复逻辑，使代码更清晰，也便于未来可能的扩展。