[nextjs] NextImage causes 500 Internal Server Error on Vercel after layout updates in basic-nextjs-pages-router

[sc-naveenhedallaarachchi]

• This PR follows the Contribution Guide
• Changelog updated
• Upgrade guide entry added

Description / Motivation

Summary

Fixes a production 500 Internal Server Error when rendering Sitecore NextImage components on Vercel.

Next.js attempts to sort frozen image configuration arrays, causing:

TypeError: Cannot assign to read only property '0' of object '[object Array]'

Changes

• Clone frozen Next.js image configuration arrays before rendering.
• Clone Sitecore image field values to avoid mutating layout data.
• Fall back to a native when the known sorting error occurs.
• Add regression tests for frozen image fields and configuration arrays.

Testing Details

• Unit Test Added
• Manual Test/Other (Please elaborate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[changeset-bot]

🦋 Changeset detected

Latest commit: e92ca0b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sitecore-content-sdk/nextjs	Patch

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[github-actions]

📦 Package Size and Test Coverage Report

Package	Base Size	PR Size	Δ Change	Base Coverage	PR Coverage	Δ Change
analytics-core	69.05 KB	69.05 KB	✅ 0.00 KB	97.44%	97.44%	0.00%
angular	421.74 KB	421.74 KB	✅ 0.00 KB	94.08%	94.08%	0.00%
cli	63.35 KB	63.35 KB	✅ 0.00 KB	73.80%	73.80%	0.00%
content	517.53 KB	517.53 KB	✅ 0.00 KB	93.16%	93.16%	0.00%
core	139.38 KB	139.38 KB	✅ 0.00 KB	91.80%	91.80%	0.00%
create-content-sdk-app	549.69 KB	549.69 KB	✅ 0.00 KB	96.47%	96.47%	0.00%
events	72.33 KB	72.33 KB	✅ 0.00 KB	97.97%	97.97%	0.00%
nextjs	589.52 KB	600.17 KB	🔺 +10.65 KB	91.97%	91.95%	-0.02%
personalize	64.01 KB	64.01 KB	✅ 0.00 KB	99.74%	99.74%	0.00%
react	254.44 KB	254.44 KB	✅ 0.00 KB	93.83%	93.83%	0.00%
search	16.69 KB	16.69 KB	✅ 0.00 KB	98.89%	98.89%	0.00%
Total	—	—	🔺 +10.65 KB	—	—	—