v3.0.0

Added

• TypeScript support with generated type definitions (CartFlow.d.ts).
• ES Module support (import CartFlow from 'cartflow') support.
• Updated documentation in README.md for better clarity.
• SHOWCASE.md to highlight projects using CartFlow.js.
• CONTRIBUTING.md to guide community contributions.

Improved

• Packaging optimized for modern bundlers (CommonJS + ESM output).
• Development workflow with ESLint, Prettier, and Tsup integration.
• Documentation updates in README.md for better clarity and examples.

Changed

• Minor internal refactoring and codebase cleanups.