Add analytics consent opt-in and bundle styles

[carloshskp]

Summary

• add an in-app analytics consent flow that stores preferences, preconnects conditionally, and loads Google Tag Manager/GA only after approval
• move inline styling into the Tailwind bundle via the main entry import to keep the critical path leaner and hashed for production
• update documentation, Tailwind content paths, and e2e coverage to reflect the consent-gated analytics behaviour

Testing

• yarn test:unit
• yarn test:e2e (fails: Playwright browsers are not installed in the environment; run yarn playwright install before retrying)

---

Codex Task