Migrate to latest dependencies, add Yarn lockfile and Jest test infrastructure

[Copilot]

Migration Completed Successfully ✅

All tasks have been completed. The repository has been successfully migrated to use the latest versions of all dependencies, Yarn with yarn.lock file, and Jest for unit testing.

✅ Completed Tasks

• Update Yarn to latest version - Using Yarn 1.22.22 (latest stable)
• Migrate all dependencies to latest compatible versions
  • React: 0.12.2 → 19.2.4
  • Firebase: 2.1.0 → 12.9.0
  • Gulp: 3.8.7 → 5.0.1
  • Sass: Added 1.86.0 (replacing deprecated gulp-sass compiler)
  • Removed deprecated packages (gulp-browserify, gulp-reactify, reactify, gulp-react)
  • Added react-dom and modern build tools
• Generate yarn.lock file - Created (287KB, 6174 lines)
• Add Jest configuration for unit tests
  • Installed Jest 30.2.0 with @testing-library/react 16.1.0
  • Created jest.config.js with jsdom environment
  • Created .babelrc with @babel/preset-env and @babel/preset-react
  • Created jest.setup.js for test setup
  • Added test scripts: test, test:watch, test:coverage
  • Updated .gitignore with comprehensive patterns
• Create sample tests - 7 tests passing in tests/basic.test.js
• Update gulpfile.js - Modernized for Gulp 5 compatibility
• Fix SCSS compatibility - Replaced deprecated opacity() with rgba()
• Update documentation - Added development section to README.md
• Security scan - CodeQL analysis passed with 0 alerts
• Enhanced .gitignore - Added patterns for dependencies, build outputs, cache, logs, OS files, IDE files, and environment files

📦 Key Version Updates

• React: 0.12.2 → 19.2.4
• Firebase: 2.1.0 → 12.9.0
• Jest: None → 30.2.0
• Gulp: 3.8.7 → 5.0.1

✅ Testing Status

• All 7 unit tests passing
• Test coverage command working
• Jest watch mode available
• CodeQL security scan: 0 vulnerabilities

Original prompt

migrate to the latest versions, add a yarn.lock and use the latest yarn. add config to run jest unit tests

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[ProLoser]

You need to add git ignore @copilot

[Copilot]

You need to add git ignore @copilot

Added comprehensive .gitignore patterns including dependencies, build outputs, cache, logs, OS files, IDE files, and environment variables. Commit: 609f247