Hydrogen October 2025 release

The Hydrogen October 2025 release (v2025.10.0) is out. This release updates the Storefront API and Customer Account API to 2025-10 and adds new cart mutations that simplify multi-gift-card and multi-address checkout flows.

• Updated Storefront API and Customer Account API to 2025-10 (#3352)
• Added cart.addGiftCardCodes to append gift card codes without re-submitting existing ones (#3401)
• Added cart.replaceDeliveryAddresses to replace all delivery addresses in a single call (#3406)
• cart.updateDeliveryAddresses([]) now clears all delivery addresses on the cart. Previously this was a no-op. (#3393)
• Added visitorConsent support on the @inContext directive for Storefront API parity (#3408)

Check out the full release notes for more details. And please drop your comments, feedback, and suggestions in GitHub Discussions.