fix: #3637711 The default page layout prints the page title in a span, so a node page has no h1

Rajab Natshahrequested to merge
3637711-page-title-h1 into 1.0.x

Issue: https://www.drupal.org/node/3637711

The default page layout placed the page title source straight in its main section. Display Builder 1.0.0-beta10 prints that source as the title text only, in a <span> (upstream #3621589), so a node page had no h1. The layout now puts the title in the Heading component (ui_suite_uikit:heading), level 1, as webtheme and UIkit Admin do, and composer.json conflicts with the Display Builder releases before 1.0.0-beta10, whose page title prints an h1 of its own. The recipe job counts one h1 on /support, and the accessibility feature checks the Support page and the page not found page.

Proof: on webship12, with the layout imported on its own, curl -s https://webship12.ddev.site/support | grep -c '<h1' went from 0 to 1, and 06-accessibility.feature "A node page has its structure" passes (Expected 1 <h1>, found 0. before).

Not part of this change: /products and /form/contact in the same accessibility feature still fail on Heading hierarchy skips 1 level(s) (h1, then h3), which the missing h1 hid.

AI-Generated: Yes

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