Fix cart route so it works with no-js

[wizardlyhel]

WHY are these changes introduced?

Cart route doesn't render the cart when JavaScript is disabled. This change fixes the cart route so that it works with no-js.

WHAT is this pull request doing?

HOW to test your changes?

Post-merge steps

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[shopify]

Oxygen deployed a preview of your hl-fix-cart-route branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	December 10, 202410:28 PM
metaobjects	✅ Successful (Logs)	Preview deployment	Inspect deployment	December 10, 202410:28 PM
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	December 10, 202410:28 PM
classic-remix	✅ Successful (Logs)	Preview deployment	Inspect deployment	December 10, 202410:28 PM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	December 10, 202410:28 PM

Learn more about Hydrogen's GitHub integration.