feat: add hexColor validation rule

[devakowakou]

• Add hexColor rule to validate hex color codes (#FFF or #FFFFFF)
• Add English translation for error message
• Add comprehensive unit tests (6 test cases)
• Fix TypeScript lib configuration to support ES2016+ features
• All tests passing (58/58)

Pull Request Template

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Related Issue

Closes #

Type of Change

• Bug fix
• New feature
• Breaking change
• Other

Checklist

• Tests added/updated
• Breaking changes documented

Additional Notes

[github-actions]

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[Claudye]

Hi @devakowakou , thanks for your contribution! The hexColor validation rule is interesting, but we’ll leave this PR open for now. In the meantime, we have some open issues you can help with if you’d like to pick one up.

[devakowakou]

Hi @devakowakou , thanks for your contribution! The hexColor validation rule is interesting, but we’ll leave this PR open for now. In the meantime, we have some open issues you can help with if you’d like to pick one up.

Hello @Claudye , I am interested and will look into the issues. I will get on it.

[Claudye]

Hi @devakowakou , thanks for your contribution! The hexColor validation rule is interesting, but we’ll leave this PR open for now. In the meantime, we have some open issues you can help with if you’d like to pick one up.

Hello @Claudye , I am interested and will look into the issues. I will get on it.

Thanks!