Implement Posthog for analytics

[akeight]

Tba later

[Jose-Gael-Cruz-Lopez]

Triage note — leaving this open, not started.

The body is Tba later, and PostHog needs three decisions I shouldn't make on your behalf:

1. A project API key, which means creating a PostHog account — I don't create accounts or handle credentials.
2. What to track. Page views only, or globe/deck interactions, submit-form funnels, outbound listing clicks?
3. Consent. The site is public and open source, so an analytics SDK likely needs a cookie/consent banner and a privacy-policy line. That's a product decision with legal shape to it.

Once there's a spec and a key in the project's env, the implementation itself is small. Happy to pick it up then.