Adjust default_admin's top bar to the landmark used with the navigation module

Great to see this moved over.

Looks like just removing top-bar--gin.html.twig would create some chaos with dark mode.

The image above wasn't the best example because I was confusing the primary aside.
However, here is a better one.

Without the gin toolbar override. In other words, what happens if we delete that file.

Removing the gin toolbar creates color contrast issues with the submenus

With gin override.

That said, if all we need for the MVP of this issue is to move a step forward. The PR above is similar to the one on the gin project and provides us with a more consistent experience.

I should add the main color issue lies on the css class gin--navigation-top-bar missing if we remove the twig override.
Other than that DDEV VRT fails because removing the file also gets rid of the gin_breadcrumbs so idk if we are ok losing those.

If we merge the PR above then we don't have to take care of those issues yet and then most of the playrights test pass and the only that failed seem to be a false positive.

I suspect that the color issue should be addressed elsewhere. This should be focused on adding back in the landmarks.

I'd love to the landmark brought into the theme.

RE #7:

Creating color contrast issues and / or losing breadcrumbs would be regressions.

Some code for dark mode will be needed regardless. Personally, I think that should remain in the theme.

If we can move the color issue to a separate issue?

I added a follow-up issue to address the color issues that @bernardm28 mentioned in #7

https://www.drupal.org/project/drupal/issues/3611446

@smustgrave the patch associated with this issue doesn't have any color changes in it. We should be able to assess these separately now.

The Needs Review Queue Bot tested this issue. It no longer applies to Drupal core. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide to find step-by-step guides for working with issues.

I think it needs a rebase.

I'll rebase it.

Rebased.

To me, the IS needs updating because it references Gin and the screenshot of the problem doesn't match what I see with a fresh install on main (for example, there are no "Edit", "Preview", "Delete" buttons).

Issue fork got rebased.

I think the name of the template file changed in main to top-bar--default-admin.html.twig.

Alternate STR:

• Log in as admin.
• Go to /user/1/edit.
• Run a scan with the Axe browser extension with best practice rules enabled.