fix(yaml): resolve empty props blocks instead of throwing

[adamdehaven]

🔗 Linked issue

#319

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Empty, whitespace-only, or comment-only YAML props/frontmatter blocks (e.g. ::hero\n---\n---\ncontent\n::) threw YAMLException: expected a document, but the input is empty because parseYaml() used js-yaml's load(), which throws whenever it finds zero documents.

parseYaml() now uses loadAll() and branches on documents.length: zero documents resolves to undefined (treated like an omitted block), one document parses normally, and more than one still throws — preserving load()'s original single-document guard. This avoids matching on the exception's message/reason, which would be fragile given the ^5.2.1 caret-pinned js-yaml dependency.

parseFrontmatter() falls back to {} via ?? (not ||) so legitimate falsy scalar documents (0, false, null) aren't miscoerced.

No changes needed in syntax.ts or json-render.ts — both already handle an undefined/falsy result.

📝 Checklist

• I have linked an issue or discussion.
• I have run pnpm verify and it passes.
• I have updated the documentation accordingly.

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commit: 1657bcf

[farnabaz]

Thanks