Refactor with React and Node.js - Modern Web Application Architecture

[Copilot]

• Set up Node.js project structure with package.json
• Create backend API server in Node.js to fetch data from AtCoder API
• Set up React application structure
• Convert main statistics page to React components
• Convert problem list pages to React components with routing
• Migrate styling to work with React
• Update build process and documentation
• Preserve existing functionality (dark/light mode, color themes, tabs)
• Update GitHub Actions workflows for new build process
• Fix GitHub Actions errors by adding package-lock.json
• Test the application functionality

Summary: Successfully refactored the AtCoder Statistics project from Python static site generator to a modern React + Node.js application. Fixed GitHub Actions CI/CD workflows by adding package-lock.json for npm ci command. The new architecture provides real-time data fetching, client-side routing, and better maintainability while preserving all existing features.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Help Wanted] Refactor with React and NodeJS</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #57

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[wulukewu]

@copilot fix the actions errors that runs on github

[Copilot]

@copilot fix the actions errors that runs on github

Fixed in commit 45c87b1. The issue was that the workflows used npm ci which requires package-lock.json, but the file was excluded in .gitignore. I've now:

1. Generated package-lock.json with all dependencies locked
2. Removed it from .gitignore so it's committed to the repository
3. Verified the build works with npm ci

The GitHub Actions workflows should now run successfully as they can use npm ci for faster, reproducible builds.

[github-actions]

PR Preview

Preview	Branch	Timestamp
Deployed Preview	main	2025-10-06 23:57:02 UTC