Base production template - before Solstice specific code

I've worked to add what I need to the react-tanstarter template.
I'm releasing this updated template before I add app specific code.
My intent here is to put in the effort up front to make a solid foundation for a new app that will be have majority LLM contributions.

Libraries I've added:
Testing:

• Vitest: For unit and component testing.
• @testing-library/react: For testing React components.
• jsdom: To simulate a browser environment for tests.
• @vitest/coverage-v8: For code coverage reporting.

CI/CD & Automation:

• GitHub Actions: For continuous integration and deployment workflows.
• Netlify CLI: Used in your dev script and deployment workflows.
• Codecov: For tracking test coverage.
• Husky: For running Git hooks.
• lint-staged: For running linters on staged files.

Database & Environment:

• @t3-oss/env-core & Zod: For environment variable validation.
• @neondatabase/serverless: Specific driver for Neon database.
• dotenv-expand: For managing environment variables.

What I've improved:

Developer Experience:

• Comprehensive test setup with watch mode, UI, and coverage reporting
• Pre-commit hooks ensuring code quality
• Environment validation with helpful error messages at startup
• Organized npm scripts by category (dev, test, db, etc.)
• Dependency management with taze

Production Readiness:

• CI/CD pipelines for automated testing and deployments
• Preview deployments for every pull request
• Secure environment configuration with validation
• Advanced auth setup with session management
• Multiple database connection options (pooled/unpooled)

Project Structure:

• Organized shared utilities and hooks
• Comprehensive documentation
• GitHub secrets configuration guide
• Advanced theme system supporting light/dark/system modes

This enhanced template provides a solid foundation for building production-ready applications with modern best practices baked in from the start.