Stop page_navigation_menu rendering its title as a hardcoded h4

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Summary

page_navigation_menu.vue renders its title as a hardcoded <h4>. On a page whose surrounding headings don't lead up to it, that skips heading levels, and axe reports heading-order (moderate). The story hides this by skipping the rule for every story in the file, with no comment.

Proposal

• Render the title as something other than a heading, for example a <p> that labels the <nav> through aria-labelledby. It's styled as small, subtle text, so it reads as a label rather than a section heading.
• Remove the heading-order skip from page_navigation_menu.stories.js.

The component is used in the CI/CD Catalog resource details (ci_resource_components.vue), so check the heading outline there after the change.