[Analytics] Fix user IDs in Posthog

[mplorentz]

When Posthog lists users it displays some with a NIP-05, some with an npub, and some with a UUID. Most of the users with a UUID also have an npub set, and we want Posthog to display that.

I think we need to submit the npub as a property when we call Analytics.identify in the app, and then add the npub to the list of properties used for "Person Display Name" in the PostHog settings.

[martindsq]

I set npub as the preferred property after NIP-05 for displaying person names in PostHog.

You can have an example here https://us.posthog.com/project/56924/person/0191571B-2964-7D9B-BF48-8E7A6C08BE9C of a user with both npub and NIP-05 set.

[setch-l]

@martindsq @mplorentz - Admittedly I'm a bit unclear on what the expected outcome should be of this ticket.

These are the steps I used to test it.

1. Open Posthog
2. Navigate to a dashboard
3. Click on a day
4. Click on the users for the day
   Expected that list should be populated by Npubs
   Issue: It is still populated by a mix of posthog ids, npubs and NIP05s

When I copied a posthog ID and searched for it in the people search, it yielded this result:

https://us.posthog.com/project/56924/person/0191888F-49C2-7551-86FF-69563B95129E#activeTab=properties

Which still does not have either the NPub or the Nip05.

[mplorentz]

@setch-l it looks like this hasn't been deployed to production yet. We won't start seeing npubs replace the UUIDs until the build is in production and folks launch the app so it can report their npub to PostHog.

Although you can do some testing with a staging or production build. Just generate a fresh account, don't set an NIP-05, and then search for them in https://us.posthog.com/project/56924/persons and their npub should show up as the primary identifier, not the ugly UUID.