Setup: Turborepo tooling, CI/CD, monitoring and analytics.

[supermarios77]

This PR adds the core development and production infrastructure for Linglix:

• Turborepo monorepo structure with shared configs (ESLint, Prettier, Jest preset)
• GitHub Actions CI workflow (lint, unit tests, build, affected-only execution)
• Jest + React Testing Library setup (unit/component testing)
• Playwright E2E testing skeleton (with smoke test and webServer integration)
• Sentry (error tracking + performance + session replay)
• PostHog (product analytics + autocapture + custom events)
• Environment variable handling and turbo.json globalEnv declarations

All checks pass locally and in CI. No breaking changes to application code.

Next steps: db implementation on a feature branch.

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Project	Deployment	Actions	Updated (UTC)
linglix	Error		Feb 20, 2026 9:17am