Fix readonly fetching happening too often.

[MitjaBezensek]

The problem happened because we cleared the readonlyUrl from shared state. This was happening every time the url changed (so panning, zooming,...). Now, instead of clearing the readonlyUrl we pull out the room prefix and slug from the readonly url.

Change Type

• sdk — Changes the tldraw SDK
• dotcom — Changes the tldraw.com web app
• docs — Changes to the documentation, examples, or templates.
• vs code — Changes to the vscode plugin
• internal — Does not affect user-facing stuff

• bugfix — Bug fix
• feature — New feature
• improvement — Improving existing features
• chore — Updating dependencies, other boring stuff
• galaxy brain — Architectural changes
• tests — Changes to any test code
• tools — Changes to infrastructure, CI, internal scripts, debugging tools, etc.
• dunno — I don't know

Test Plan

1. Create a shared room.
2. Move the camera around.
3. We should not be constantly fetching the readonly slug.

• Unit Tests
• End to end tests

Release Notes

• Fix an issue where readonly slug was being fetched every time the url changed (panning, zooming,...).

[vercel]

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Name	Status	Preview	Updated (UTC)
examples	✅ Ready (Inspect)	Visit Preview	May 13, 2024 10:56am

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Name	Status	Preview	Updated (UTC)
tldraw-docs	⬜️ Ignored (Inspect)	Visit Preview	May 13, 2024 10:56am