TypeScript type definitions shared between frontend and backend.

• id - Unique user identifier
• email - User's email address
• created - Account creation timestamp
• updated - Last update timestamp

• id - Unique note identifier
• note - Note content (text)
• created - Note creation timestamp
• updated - Last update timestamp

• AuthResponse - Login response with token and user data
• LoginRequest - Login request payload
• CreateNoteRequest - Create note request payload
• UpdateNoteRequest - Update note request payload

These types ensure type safety across the entire application and provide clear contracts for API communication.