chore(deps): upgrade nextjs to 14.2.29

[kennylam]

Closes https://github.com/carbon-design-system/mend-issues/issues/13

Addresses CVE-2025-30218 by upgrading Next.js to >=14.2.26.

Changelog

Changed

• Upgrade Next.js in /examples/ to v14.2.29

Testing / Reviewing

Everything should build and pass CI flows. Optionally test examples/nextjs or examples/light-dark-mode using yarn dev and/or yarn build to verify everything builds as expected.

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

More details can be found in the pull request guide

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.48%. Comparing base (cbd34d3) to head (e4d9f8e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #19499   +/-   ##
=======================================
  Coverage   84.48%   84.48%           
=======================================
  Files         373      373           
  Lines       14708    14708           
  Branches     4822     4822           
=======================================
  Hits        12426    12426           
  Misses       2135     2135           
  Partials      147      147           

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