chore(angular-react): Migrate ItemComponent to React

[devin-ai-integration]

Summary

Migrates the Angular ItemComponent to React as part of the Angular-to-React migration effort. The original Angular component is a simple presentational component that displays shop items with name, description, price, and a like button.

Changes:

• Created ItemComponent.tsx with TypeScript interface for props (name, description, price, onLike?)
• Converted @Input() decorators to React props
• Ported the like() method as handleLike() event handler
• Converted Angular template to JSX with inline styles matching the original SCSS
• Added Jest configuration for React testing (jest.config.js, jest.setup.js)
• Added 9 unit tests using React Testing Library
• Added React, Jest, and testing library dependencies

Note: The original Angular component is preserved; this adds the React equivalent in a new react-components directory.

Review & Testing Checklist for Human

• Verify visual parity: The React component uses inline styles instead of Angular Material's mat-card. Compare the rendered output visually to ensure acceptable appearance
• Confirm heart icon: Angular used mat-icon with "favorite"; React uses HTML entity ❤. Verify the icon looks acceptable
• Review onLike callback addition: The React version adds an optional onLike prop callback (enhancement over original). Confirm this is acceptable for the migration
• Run npm run test:react to verify all 9 tests pass locally

Suggested test plan:

1. Run npm run test:react to execute Jest tests
2. If possible, render the React component in a test harness to visually compare with the Angular version

Notes

• Angular tests could not be run locally due to Node.js version incompatibility with Angular 12 (environment issue, not introduced by this PR)
• The component is placed in src/app/shop/infrastructure/react-components/item/ to parallel the Angular structure

Link to Devin run: https://app.devin.ai/sessions/ef76c9484037444187d936516462a74f
Requested by: @milind-cognition

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