Replace jotai-urql with just urql

[sandhose]

This was unnecessarily complicated.
This replaces everything which used jotai-urql with just urql calls.

Next step is to replace the custom jotai-based router with tanstack router, but I prefer to do that in a second PR to make it easier to review.

For reviewers, most interesting changes are:

• in src/app.tsx, the app root now loads the current user ID to allow giving a non-nullable user ID down the component tree, and avoid having a "is the user ID null" logic in every route
• for error handling, I prefer to just throw if result.error is set and handle the error in the nearest error boundary
• annoyingly, urql doesn't know it runs in suspense mode in its typings, so result.data is nullable, which should never happen unless result.error is set. So there is a lot of:

  const [result] = useQuery(...);
  if (result.error) throw result.error;
  if (!result.data) throw new Error(); // Suspense mode is enabled

• the pagination logic was probably the biggest change. See src/pagination.tsx for the hooks, and src/components/BrowserSessionList.tsx for an example usage

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[t3chguy]

Looks sane