fix: add twig boolval fallback

[callinmullaney]

This PR does the following:

• Adds a narrow Twig.js compatibility fallback for Twig.lib.boolval when dependency optimizer or transitive package interop leaves the helper undefined.
• Preserves Twig.js’ native boolval implementation when it already exists.
• Adds regression coverage for missing boolval, including a real Twig conditional render.
• Documents the Twig.lib.boolval is not a function migration troubleshooting case.

Related Issue(s)

• N/A

Notes:

• This fallback only patches the missing internal helper. It does not override a valid Twig.js-provided boolval.
• The migration note still recommends clearing Storybook/Vite caches and confirming project-level dependency overrides because the error usually points to package or optimizer drift.

Functional Testing:

• Run npm run test -- src/extensions/twig/__tests__/register.test.js --runInBand
• Run targeted ESLint against the touched Twig registration files
• Run targeted Prettier against the touched files
• Confirm pre-commit full lint and Prettier checks complete with no errors

Security

No new user input handling or external execution paths are introduced. The change only fills a missing internal Twig.js boolean coercion helper.

Accessibility

No accessibility review needed. This change does not alter rendered markup, styles, or interactive behavior except allowing existing Twig conditionals to render successfully.

[github-actions]

🎉 This PR is included in version 4.0.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀