feat: add TypeScript lessons and learning panel

- Introduced a new script to check TypeScript lesson files for errors.
- Created a main TypeScript file to render lessons and their details.
- Added lesson definitions with starter and answer codes.
- Implemented a user interface for navigating and running lessons.
- Styled the application with CSS for a better user experience.
- Updated README to reflect the new TypeScript section and usage instructions.

04-dom-events-async/06-bubbling-and-delegation/README.md

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+# 练习 6：冒泡、委托和 stopPropagation
+
+## 目标
+
+理解事件会冒泡，并学会在列表里使用事件委托。
+
+## 你要练什么
+
+- 事件冒泡
+- `event.target`
+- 事件委托
+- `stopPropagation()`
+
+## 任务
+
+- 点击外层面板时输出一条日志
+- 点击列表项时，通过事件委托切换激活状态
+- 点击列表项里的删除按钮时，阻止冒泡并删除当前项
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/06-bubbling-and-delegation/answer.js)