TF-3253 Fix body content is lost

[dab246]

Issue

3253

Root cause

• The section tag of the html content is removed when sanitizing the html

Solution

• Add the section tag to the list of tags allowed to appear in html

Resolved

https://github.com/user-attachments/assets/a4b6bd07-81ed-4cc2-82a2-2b6a9ed8c821

[github-actions[bot]]

This PR has been deployed to https://linagora.github.io/tmail-flutter/3254.

[hoangdat]

I found some event handler for section in cheat sheet. Can you add more test to make sure it is also sanitized well

[dab246]

I found some event handler for section in cheat sheet. Can you add more test to make sure it is also sanitized well

done