chore(right float area): add tips

[githubdudu]

已知问题 Background

1. In Hexo theme, there are missing tips for the right float button which the endspace theme has.

   Hexo theme:
   

   Endspace theme:
   

解决方案 Solution

1. Take the Endspace theme as example. Follow it

改动收益 Benifit

1. More consistent across themes
2. User-friendly

具体改动 Scope

Only affect Hexo theme.

1. themes/hexo/components/ButtonFloatDarkMode.js
   add 'Light Mode' or 'Dark Mode' just like Endspace theme.
2. themes/hexo/components/ButtonJumpToComment.js
   add "Jump to Comment" tips. Same as Endspace theme.

测试确认

• 本地开发环境测试通过
• 生产环境构建测试通过

其他问题 Related issues / Considerations

There are also same issue in themes : fuwari, commerce and matery.

1. Should I also change fuwari and matery theme?
2. About the commerce theme, the right float button doesn't even show up correctly in the page.

用户文档（docs/user-guide/）

若本 PR 未 修改 docs/user-guide/、docs/developer/ 中与站长相关的说明，可勾选「不适用」并跳过本节。

• 不适用（无文档改动）
• 已按 维护工作流 自检
• 路径符合 docs/user-guide/ 目录约定
• 已更新 user-guide/README.md（新增/移动文章时）
• 已更新 ARTICLE_INDEX.md（新 slug 或路径变更时）
• 环境变量名与 conf/*.config.js 一致（若文档涉及配置）
• 示例中无真实 Token、.env、私有 ID
• 保留或更新了「原文链接」（若源自 docs.tangly1024.com）

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