feat: Swap ingestion endpoints to new .i.posthog.com ones

[benjackwhite]

Problem

We want to properly roll out the new endpoints. We will keep supporting old ones but this makes it clear for new users what they should use.

Changes

• Updated all uses of the api host origin to show the appropriate host
• Tried to find all app.posthog.com references that don't make sense anymore and update them to us.posthog.com
• Updated the snippet to detect the new ingestion endpoint and swap to assets

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

How did you test this code?

[github-actions]

Size Change: 0 B

Total Size: 1.01 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.01 MB

_{compressed-size-action}

[posthog-bot]

This PR hasn't seen activity in a week! Should it be merged, closed, or further worked on? If you want to keep it open, post a comment or remove the stale label – otherwise this will be closed in another week.

[pauldambra]

🚢