Fix: Add missing role attribute to enhance accessibility and improve …

[Aepaul]

…screen reader announcements

PR Summary:

This PR adds missing role attributes to improve accessibility and enhance screen reader announcements.

Checklist

• Added PR summary for release notes
• Requested review from UX (Only for changes that are affecting the experience or perceivable visual details)
• Created a ticket for the help.shopify.com documentation team about updates to theme settings. (Internal-only task)
• Followed theme code principles
• Linted with Theme Check
• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility