ci: configure Netlify so deploy previews actually build

[Eliav2]

Netlify is connected for preview URLs but has never produced a successful deploy. react-xarrows.netlify.app currently returns 404, and the checks on #208 are all Deploy failed.

Why it fails

There is no netlify.toml, so Netlify falls back to auto-detection, and auto-detection cannot work on this repo:

• the site lives in examples/, not the repo root
• but it cannot be built from examples/ either, because it resolves the library from ../src through a Vite alias, so a base directory of examples/ would not see it
• and the root build script builds the library into lib/, which is not a website

Fix

Pins the build command, publish directory and Node version.

command = "pnpm --filter react-xarrows-examples run build"
publish = "examples/dist"
NODE_VERSION = "22"

GITHUB_PAGES is deliberately left unset. examples/vite.config.ts reads it to choose between the /react-xarrows/ base GitHub Pages needs and the root base Netlify serves from, so setting it here would break every asset URL. Verified locally that with it unset the emitted index.html references /assets/..., which is what Netlify wants.

This PR tests itself

Netlify reads netlify.toml from the pull request branch, so the deploy preview check on this PR is the verification. If it goes green, previews work.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Added Netlify deploy preview configuration.
  • Configured previews to build and publish the examples site.
  • Updated the deployment environment to use Node.js 22.

[codesandbox]

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[netlify]

✅ Deploy Preview for react-xarrows ready!

Name	Link
🔨 Latest commit	6e0ceff
🔍 Latest deploy log	https://app.netlify.com/projects/react-xarrows/deploys/6a7778bd3ac16c0008bda9dd
😎 Deploy Preview	https://deploy-preview-209--react-xarrows.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

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[coderabbitai]

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ℹ️ Recent review info

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Configuration used: defaults

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Run ID: bbce3f74-5bef-4775-904b-ed94101a4a7c

📥 Commits

Reviewing files that changed from the base of the PR and between 94e2496 and 6e0ceff.

📒 Files selected for processing (1)

• netlify.toml

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📝 Walkthrough

Walkthrough

The pull request adds Netlify configuration for deploy previews. Netlify builds the examples package from the repository root, publishes examples/dist, uses Node.js 22, and leaves GITHUB_PAGES unset.

Changes

Netlify deployment

Layer / File(s)	Summary
Configure Netlify builds netlify.toml	Defines the examples build command, publish directory, Node.js 22 environment, and root asset-path behavior for Netlify.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 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 clearly and concisely describes the main change: configuring Netlify to build deploy previews.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/netlify-previews

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