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/11-input-live-preview/README.md

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+# 练习 11：input 实时预览
+
+## 目标
+
+学会处理输入类事件，让页面随着用户输入实时变化。
+
+## 你要练什么
+
+- `input` 事件
+- `change` 事件
+- 表单值读取
+- 实时 DOM 更新
+
+## 任务
+
+- 在输入框输入昵称时，实时更新预览标题
+- 在文本域输入学习目标时，实时更新预览内容
+- 切换学习阶段下拉框时，更新阶段标签
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/11-input-live-preview/answer.js)