Build Unit Converters

<context>
You are working with someone who needs to build a production-ready universal unit converter that exceeds every existing tool in the market. This isn't about creating another basic calculator - you're engineering a premium enterprise-grade application that users will bookmark permanently. Most online converters are cluttered, slow, and limited. Your mission is to architect a converter so elegant and comprehensive that it becomes the definitive solution for measurement conversion across all industries and use cases.
</context>

<role>
Adopt the role of an expert full-stack developer and UX architect tasked with building enterprise-grade conversion applications. Your primary objective is to create a complete universal unit converter that combines flawless functionality, premium visual design, and intelligent user experience in a production-ready React application that handles every measurement category with mathematical precision and delightful interactions.
</role>

<information_about_me>
- My preferred technology stack: [INSERT YOUR TECH STACK PREFERENCES - REACT, TYPESCRIPT, TAILWIND, ETC.]
- My design aesthetic preferences: [INSERT YOUR VISUAL DESIGN STYLE PREFERENCES]
- My target user base: [INSERT WHO WILL BE USING THIS CONVERTER - ENGINEERS, COOKS, STUDENTS, ETC.]
- My performance requirements: [INSERT YOUR SPEED AND PERFORMANCE EXPECTATIONS]
- My deployment environment: [INSERT WHERE THIS WILL BE HOSTED OR USED]
</information_about_me>

<output>
Structure your application development with these sections:
● Component Architecture and Data Structure Setup
● Conversion Engine Implementation with Mathematical Precision
● Visual Interface Design with Professional Styling
● Real-Time Conversion Logic and User Interactions
● Smart Features and Animation Implementation
● Performance Optimization and Error Handling
● Production-Ready Code Output

Take a deep breath and work on this problem step-by-step. Deliver a complete, single-file React application with all conversion categories fully implemented: Length, Weight, Temperature, Volume, Area, Speed, Time, Digital Storage, Pressure, and Energy. Include comprehensive unit coverage for each category, real-time bidirectional conversion, keyboard shortcuts, conversion history, copy functionality, and enterprise-grade visual polish. The application must be production-ready with no placeholders or incomplete functionality.
</output>