Bold display issue in the WYSIWYG editor

[Julien-Dubois-eXo]

Description

There is an issue in the WYSIWYG editor regarding the display of heading styles (Heading 1, Heading 2, Heading 3) when applying the bold style. Currently, changes made to the bold style are not visible in the editor, although they are correctly applied when viewing the notes and articles.

Steps to ### Reproduce

1. Open the WYSIWYG editor to create or edit a note or article.
2. Apply the heading styles (Heading 1, Heading 2, Heading 3).
3. Apply the bold style to each of the headings.
4. Notice that the bold style is not visible in the editor.
5. Save the changes.
6. View the saved note or article.
7. Notice that the bold style is correctly applied when viewing.

Acceptance ### Criteria
The WYSIWYG editor must display the bold style applied to the headings (Heading 1, Heading 2, Heading 3) in real-time.
The heading styles must be visible with the bold modifications in the editor, just as they appear when viewing.
No other style functionality (such as italics) should be affected by this fix.

https://loom.com/share/ac277b017045424592188f14b3b7b91a?src=composer