Fix TutorialLayout crash for tutorials without optional fields

[hxrshxz]

Resolves #1006

The TutorialLayout component crashes when a tutorial doesn't have featuredImage or authors in its frontmatter because it tries to call .src and .join() on undefined values.

These fields are marked optional in the schema but are actually required for the site to function. As discussed in the issue, I went with a .refine() approach so that:

• During npm run dev, the validation is skipped (via import.meta.env.DEV) so you can work on tutorials without filling in every field upfront
• During npm run build / npm run check, it enforces that authors, featuredImage, featuredImageAlt, and description are present — so incomplete tutorials can't make it to production

Also added optional chaining in TutorialLayout.astro on the two lines that were actually crashing, so the dev server doesn't blow up when those fields are missing.

[Copilot]

Pull request overview

This PR fixes crashes in TutorialLayout when tutorials lack optional authors and featuredImage fields by adding optional chaining, and adds build-time validation to ensure production builds require these fields plus description and featuredImageAlt. The solution allows flexible development iterations while enforcing completeness for production deployments.

Changes:

• Added .refine() validation in tutorial schema that skips validation in dev mode but enforces required fields (authors, featuredImage, featuredImageAlt, description) in production builds
• Added optional chaining (?.) in TutorialLayout for authors and featuredImage field accesses to prevent runtime crashes during development

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/content/tutorials/config.ts	Added production-only validation using .refine() to enforce required fields while keeping them optional in the type system for dev flexibility
src/layouts/TutorialLayout.astro	Added optional chaining to prevent TypeError crashes when accessing authors and featuredImage properties

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[ksen0]

Thanks @hxrshxz , a couple of minor tweaks please.

[hxrshxz]

I have addressed your feedbacks , thank you