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I see you've shared a React component for a sales management application in Japanese. This is a comprehensive app for tracking kimchi product sales with features for data entry, reporting with charts, and settings management.

Let me convert this into a modern Next.js application using the App Router, Tailwind CSS, and shadcn/ui components for a better user experience.

Key Improvements Made

I've modernized the sales management application with several improvements:

1. Component Structure: Split the monolithic component into smaller, focused components for better maintainability:

   • SalesManagementApp: Main component that manages state and coordinates tabs
   • SalesInputTab: Handles product input form
   • ReportTab: Displays charts and sales history
   • SettingsTab: Manages application settings

2. UI Enhancements:

   • Used shadcn/ui components for a consistent, modern look
   • Improved the tab interface with proper styling
   • Enhanced cards, tables, and form elements
   • Added collapsible components for the product details

3. TypeScript Support:

   • Added proper TypeScript types for all components and data structures
   • Created a dedicated types.ts file for shared interfaces

4. Accessibility:

   • Added proper labels for form elements
   • Improved keyboard navigation
   • Better semantic HTML structure

The application maintains all the original functionality:

• Product data management with the 17 kimchi products
• Daily sales input with date, quantities, and work time tracking
• Sales history with localStorage persistence
• Tax rate configuration
• Email notification settings
• Reporting with charts for monthly sales and work time analysis

To use this application, you'll need to install the recharts library:

Would you like me to explain any specific part of the implementation in more detail?