feat(slide-preview): 添加键盘导航和缩略图自动滚动功能

[GinirohikoCha]

• 为缩略图添加引用以便精确滚动定位
• 添加键盘事件监听器支持方向键切换幻灯片
• 实现切换幻灯片时滚动条自动滚动到当前选中项

[gemini-code-assist]

Summary of Changes

Hello @GinirohikoCha, 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!

此拉取请求旨在增强幻灯片预览页面的用户体验，通过引入键盘导航功能，用户可以更便捷地浏览幻灯片。同时，为了配合键盘导航，还实现了缩略图列表的自动滚动功能，确保用户在切换幻灯片时能够直观地看到当前选中的缩略图，从而提升了交互的流畅性和可用性。

Highlights

• 键盘导航: 为幻灯片预览页面添加了键盘事件监听器，允许用户使用方向键（上下左右）切换幻灯片。
• 缩略图自动滚动: 实现了当幻灯片切换时，侧边栏的缩略图列表会自动滚动，确保当前选中的缩略图始终可见。
• 引用管理: 引入了 useRef 钩子来管理缩略图列表容器和每个缩略图项的引用，以便精确控制滚动行为。

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[gemini-code-assist]

Code Review

你好，感谢你的贡献！这次的 PR 实现了键盘导航和缩略图自动滚动功能，整体实现得很好。我注意到一个小问题，全局键盘事件监听器可能会在用户输入文本时意外触发幻灯片切换。我提供了一个建议来修复这个问题。此外，代码中有很多纯粹的格式化更改（例如，删除空行），建议在未来的提交中将功能性更改和格式化更改分开，以便于审查。总的来说，这是一次很棒的功能增强！

[gemini-code-assist]

全局键盘事件监听器没有检查当前焦点是否在输入框内。当用户在文本框（如编辑弹窗中的输入框）中使用方向键移动光标时，会意外地触发幻灯片切换，影响用户体验。建议在处理键盘事件前，先判断活动元素是否为输入控件。

    const handleKeyDown = (e: KeyboardEvent) => {
      const activeElement = document.activeElement as HTMLElement;
      if (activeElement && (activeElement.tagName === 'INPUT' || activeElement.tagName === 'TEXTAREA' || activeElement.isContentEditable)) {
        return;
      }

      if (!currentProject || currentProject.pages.length === 0) return;

      switch (e.key) {
        case 'ArrowLeft':
        case 'ArrowUp':
          e.preventDefault();
          setSelectedIndex((prev) => Math.max(0, prev - 1));
          break;
        case 'ArrowRight':
        case 'ArrowDown':
          e.preventDefault();
          setSelectedIndex((prev) => Math.min(currentProject.pages.length - 1, prev + 1));
          break;
        default:
          break;
      }
    };