feat(blog): add code block component [INTORG-767]

[JonathanMatthey]

Summary

Adds a code block component for blog posts, syntax highlighting via Shiki, copy button, optional title, 14 supported languages. Covers the Strapi component schema, MDX serializer, and Astro render component.

Related Issue

Fixes INTORG-767

Manual Test

1. Add a Code Block to a blog post in Strapi and run MDX sync
2. Check syntax highlighting and the copy button work in the browser

Checks

• pnpm run format
• pnpm run lint

PR Checklist

• PR title follows Conventional Commits (e.g. feat: ..., fix: ...)
• Linked issue included
• Scope is focused (target ~10-20 files when possible)
• Screenshots for UI changes (if applicable)

[netlify]

❌ Deploy Preview for interledger-org-v5 failed. Why did it fail? →

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[Infi-Knight]

looks like there is no import handler for CodeBlock? i.e the export path works but the parser will hard-fail without a registered handler

[JonathanMatthey]

looks like there is no import handler for CodeBlock? i.e the export path works but the parser will hard-fail without a registered handler

very true - hadn't run the import