Wysiwyg editor is partly broken

The wysiwyg editor for content pages does not work properly.

- [ ] The toolbar displays, but is inactive.
- [ ] The preview does not accurately display what the published content will look like once saved.
- [ ] Neither markdown or HTML work consistently.

### Evidence / Screenshot (if possible)

### Relevant url?
Edit any content page. For example, https://openlibrary.org/help/faq/editing.en?m=edit
### Steps to Reproduce

1. Go to ...a content page
2. Do ...try to use the toolbar to format content

* Actual: Toolbar does not work. Preview is not accurate.
* Expected: Toolbar should work. Markdown and HTML should work.

### Details

- **Logged in (Y/N)?** y
- **Browser type/version?** chrome
- **Operating system?** macos
- **Environment (prod/dev/local)?** prod

### Proposal & Constraints

### Related files

### Stakeholders

@mekarpeles @dcapillae @jimchamp @cdrini

Start by opening the example content-page edit URL and reproducing the inactive toolbar, inaccurate preview, and inconsistent Markdown/HTML behavior in Chrome on macOS. Trace the editor entry point used by content pages and document or test each reported path; done means the toolbar works and the preview matches the saved published content.

Written by the indexing model from the issue text.