Adds support for standard storefront events and a new section and block to display product disclosures.

### Added

- [Storefront Events & Actions] Added support for app, agent, and AI cart interactions without page reloads.
- [Product disclosures] New section and block to display product disclosures on product pages.

### Fixes and improvements

- [Accessibility] Fixed aria labels and focus management on search and filtering components
- [Performance] Changed body layout styles for improved cumulative layout shift (CLS)
- Fixed missing theme setting translation strings in "Icons with Text" section