Improve Course Editing Workflow with Global Submit Button and Redirect

Currently, when editing a course, only the first section has a visible "Submit" button, limiting the ability to save all changes made across the entire page. There is no general "Submit" option that allows users to save all edits in one action. Additionally, after submitting, the user is not redirected to the course home or overview page.

To improve usability and streamline the editing experience, implement the following enhancements:

Add a global "Submit" button that saves all edits made on the course editing page.

After submitting, automatically redirect the user to the course overview (home) page.

从课程编辑页面开始，检查第一部分中现有的 Submit 按钮如何保存更改。跟踪当前的提交流程和课程概览路由；完成标准是一个全局的 Submit 操作保存页面上的所有编辑，并重定向到概览页面。