Added no title page template

[shail-mehta]

Fixes #143.

Description

Adds a Pages No Title custom page template so editors can build pages from patterns without rendering the page title or featured image on the front end, similar to Twenty Twenty-Four and Twenty Twenty-Five.

Changes

• patterns/hidden-page-no-title.php - Hidden template pattern (Inserter: no, hidden- prefix) with header, main content area (post-content only), footer, and sticky search bar. Omits the post title and featured image groups used in hidden-page.php.
• templates/page-no-title.html - One-line delegate to ipsum/hidden-page-no-title, consistent with other page templates.
• theme.json - Registers the page-no-title custom template for the page post type with the title Pages No Title (aligned with Pages and Pages Sidebar).

Screenshots

Testing Instructions

1. Start the local environment.
2. Log in at http://localhost:8899/wp-admin/ (admin / password).
3. Open Appearance → Editor → Templates and confirm Pages No Title appears under page templates.
4. Create or edit a page, set Template to Pages No Title, add content or insert a page pattern, save, and view on the front end.
5. On the front end, confirm there is no post title block output and no featured image from the template; header, footer, and sticky search bar match the default page template.
6. In the page editor, confirm the document title field still shows (expected WordPress behavior).

Use of AI Tools

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Co-authored-by: shail-mehta <shailu25@git.wordpress.org>
Co-authored-by: MaggieCabrera <onemaggie@git.wordpress.org>

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