Adjust user experience for entity view displays

Here you can find a screenshot of the changes with explanations:

Thanks a lot Yannick. We will study that after alpha4.

This form is now centrally managed by a Form Builder service, so any change in "Manage display" UI will also be visible in other integrations. Keeping this consistency is important to us.

Bu the way:

• "Display Builder" (title case, with capital B) is the name of the product / module
• "Display builder" (sentence case, with lower B) is the name of both the config entity and the instance stored in the state API (but the config entity may be renamed "Profile" later)

I will have a look as soon as 📌 [1.0.0-alpha2] Add content display overrides Active is merged because there is some changes there which may be related to your proposal.

Short exchange about wording in https://drupal.slack.com/archives/C092EUNPCRW/p1755102724433999