The website appointment page now shows a more understandable button for editing appointment content in the backend. This helps website editors quickly recognize where to make changes, reducing confusion during content management.

This commit allows to have a more understandable "edit in backend"
button on the website.

task-2889929

The website appointment content creation forms have been updated to use Odoo's newer interface framework. This keeps the appointment setup experience aligned with the broader website-in-backend changes and helps maintain consistency for future improvements.

*: website_appointment

The goal of this PR is to adapt the website "new content" form
views to OWL.

Follows the merge of the "website in backend" task at [1].

[1]: 31cc10b91dc7762e23b4bde9b945be0c4ce3fe3b

task-2687506