字数及阅读速度计算、词典建议

想问是否有可能做书籍字数统计以及已阅读字数统计功能～还希望可以根据阅读时长计算阅读速度。
另外，目前的书籍阅读中AI翻译对于英语学习的效果还是一般，只是说在阅读句子时可以辅助理解，希望有可能实现类似kindle的点击翻译功能（连接至专业词典，可以大家自由导入字典的mdx格式）或者弹出词典小框。

The issue names no files, tests, or entry points and combines reading statistics with dictionary integration and MDX import. First clarify which feature is in scope, then locate the existing reading-progress and translation interfaces. Done should be defined separately for each selected feature, including its supported dictionary behavior and reading-speed calculation.

由索引模型根据 Issue 内容生成。