Add support for MP3 format in product extensions

• Updated product extension logic to include MP3 alongside MP4.
• Modified template condition to check for both MP3 and MP4 formats: {% if product.extensions["product"] in ["mp3", "mp4"] %}

Summary by CodeRabbit

• New Features

  • Improved product detail rendering to support both audio (mp3) and video (mp4) file types.
  • Added play button for supported media types alongside the product thumbnail.

• Bug Fixes

  • Enhanced conditional logic to ensure correct display of media elements based on product type.

• Documentation

  • Maintained existing meta tags for optimal social media sharing and SEO.