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/07-timers-and-async-order/README.md

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+# 练习 7：setTimeout 和异步顺序
+
+## 目标
+
+理解同步代码和异步回调的执行先后顺序。
+
+## 你要练什么
+
+- `setTimeout`
+- 同步顺序
+- 异步回调
+- DOM 日志输出
+
+## 任务
+
+- 点击按钮后先输出“开始执行”
+- 再立刻输出“同步代码结束”
+- 然后延迟输出“异步回调完成”
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/07-timers-and-async-order/answer.js)