This PR fixes the issue where sync clients would get into a reconnect
loop after being rejected by the sync server.
- Close the socket when in the error state (see useRemoteSyncClient)
- Show a 'plx refresh the page' screen that doesn't have a sad face on
it.
<img width="665" alt="image"
src="https://github.com/tldraw/tldraw/assets/1242537/96025fa3-cc20-4f53-8f58-74e473e16702">
- If older clients who can't handle rejection well need to be rejected
(e.g. due to a store migration being added) then we send them to a
special purgatory where the canvas goes blank and it shows the offline
indicator but the websocket connection stays open and it won't try to
reconnect.
### Change Type
- [x] `dotcom` — Changes the tldraw.com web app
- [x] `bugfix` — Bug fix
### Test Plan
1. Gonna manually test this one by doing sneaky deploys to a test PR
f2827f6409