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/starter.js

@@ -0,0 +1,5 @@
+// 任务：
+// 1. 给 panel 绑定点击事件，输出一条日志
+// 2. 给 lesson-list 绑定点击事件，使用事件委托
+// 3. 点击 li 时切换 active 类名
+// 4. 点击删除按钮时，阻止冒泡并删除当前 li