Raise minimum React version to 18

[agneym]

Changes

• Raise minimum React version from 16 to 18 in peer dependencies
• Remove main field from example package (fixes Parcel serve mode error)
• Add changeset for major version bump

Summary by CodeRabbit

• Breaking Changes

  • Minimum supported React version is now 18.

• Chores

  • Updated runtime and development dependencies including component libraries, code editor tools, and testing frameworks.
  • Removed unnecessary stylesheet imports from example project.

[changeset-bot]

🦋 Changeset detected

Latest commit: 756ce7c

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

This PR includes changesets to release 1 package

Name	Type
@agney/playground	Major

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

The PR records a major version bump for the playground package, raises the minimum React peer dependency to version 18, removes configuration from the example package, and updates multiple runtime and development dependencies while adapting the Prism renderer integration to new API exports.

Changes

Cohort / File(s)	Summary
Release Configuration .changeset/raise-react-18.md	Records major version release with React 18 as minimum supported version.
Example Package Cleanup example/package.json, example/src/index.js	Removes main field from package configuration and removes @reach/tabs stylesheet import.
Playground Dependencies playground/package.json	Upgrades runtime dependencies (@reach/auto-id, @reach/tabs, prism-react-renderer, react-simple-code-editor) and dev tooling (@rollup/plugin-babel, @testing-library/react, jsdom, tsdown, vitest). Updates React peer dependencies from >=16 to >=18.
Prism Renderer Integration playground/src/Editor/EditorSetup.tsx	Updates Prism renderer to use named exports (Highlight, themes) instead of default props spreading; selects themes.nightOwl explicitly.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Possibly related PRs

• Set up Changesets for automated releases and changelog #78: Introduces Changesets workflow infrastructure that this PR leverages for recording the React version bump and major release.

Poem

🐰 A leap to React eighteen we make,
Dependencies dance, improvements awake!
Prism shines bright with exports so new,
Clean up the old, the playground shines through! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately summarizes the main change—raising the minimum React version to 18, which is reflected across all modified files including the changeset, peer dependencies, and code updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/react-18-min

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