fix/#3314-Skeleton-template]-Can't-scroll-down-to-Continue-to-checkout-button-in-Safari-mobile

[Jaewhee]

WHY are these changes introduced?

Fixes #3314

WHAT is this pull request doing?

This pull request fixes an iOS Safari cart scrolling issue where the bottom Safari toolbar overlaps the cart content and prevents users from scrolling far enough to reveal the “Continue to Checkout” button. https://www.loom.com/share/dcadbf5f8d694f67bd340372f3548087

HOW to test your changes?

Open http://localhost:3000

Open Safari on iOS (real device or simulator)

Add any product to the cart

Open the cart and scroll down

Confirm the “Continue to Checkout →” button is fully visible and clickable

Post-merge steps

Checklist

• [x] I've read the Contributing Guidelines
• [x] 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