- Add Jest testing framework configuration
- Add test files for services, types, and utilities
- Update package.json with Jest dependencies and test scripts
- Enhance pre-commit checks to include testing
- Add proper environment validation and error handling in mailgun service
- Create universal environment variable utility for Vite and Node.js
- Support both import.meta.env (browser/Vite) and process.env (Node.js)
- Add environment detection helpers (isBrowser, isNode, isTest, isProduction)
- Safely handle environment access across different runtime contexts
- TypeScript support with proper type definitions
