refactor: update next examples to v16

[joshblack]

Update our Next.js examples to v16: https://nextjs.org/blog/next-16

Changelog

New

Changed

• Update Next.js examples to use v16

Removed

Rollout strategy

• None; if selected, include a brief description as to why

This is a change only to our examples

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Latest commit: 6647f6c

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[Copilot]

Pull Request Overview

This PR updates the Next.js examples to version 16, aligning with the latest Next.js release. The changes include upgrading dependencies, updating TypeScript configurations to match Next.js 16 requirements, and adding proper type annotations.

Key changes:

• Updated Next.js from v15.2.3 to v16.0.0 and React from v18.3.1 to v19.2.0
• Modified TypeScript configuration to use jsx: "react-jsx" instead of jsx: "preserve"
• Added type annotations and theme-related attributes for better type safety

Reviewed Changes

Copilot reviewed 5 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/theming/package.json	Updated Next.js to v16.0.0, React to v19.2.0, and removed --no-lint flag from build script
examples/theming/tsconfig.json	Changed jsx compiler option to react-jsx and added .next/dev/types path to include array
examples/nextjs/package.json	Updated Next.js to v16.0.0, React to v19.2.0, and removed --no-lint flag from build script
examples/nextjs/tsconfig.json	Changed jsx compiler option to react-jsx and added .next/dev/types path to include array
examples/nextjs/src/app/layout.tsx	Added Metadata type import, typed metadata export, and added theme data attributes to html element