Environment file management

Ensure proper handling of environment files by following these practices: (1) Add actual environment files (.env, .env.local, etc.) to .gitignore to prevent sensitive data from being committed, (2) Include example environment files (.env.example) in version control to help other developers understand required configuration, and (3) Add clear documentation in example files explaining how to use them.

Example .gitignore entry:

# Environment files
.env
.env.local
.env.*.local

Example .env.example with documentation:

# Copy this file as `.env.local` and fill in these values from your service console
VITE_FIREBASE_API_KEY=
VITE_FIREBASE_AUTH_DOMAIN=

This approach ensures projects remain cloneable while protecting sensitive configuration data and providing clear setup instructions for new developers.