Collections use plural names

Always use plural names for properties representing collections (arrays/lists) in interfaces, types, and destructuring patterns. This ensures consistency between interface definitions and their usage throughout the codebase.

Example:

// ❌ Inconsistent naming
interface DigestEmailProps {
  newsletter?: EmailItem[];  // singular for array
  receipt?: EmailItem[];     // singular for array
}

// ✅ Consistent plural naming
interface DigestEmailProps {
  newsletters?: EmailItem[];  // plural matches array type
  receipts?: EmailItem[];    // plural matches array type
}

// Usage remains consistent with interface
const { newsletters, receipts } = props;

This convention:

• Makes array types immediately recognizable
• Prevents confusion between single items and collections
• Reduces bugs from property name mismatches
• Follows common JavaScript/TypeScript conventions