Store session ID as a URI param instead of in-memory

[amanape]

Motivation
Storing the token as a URI param will make it much more manageable and easier to access (React Router / Remix has a hook useSearchParams that can do just that) throughout the app rather than relying on local storage.

Technical Design
When a new session is created, store the ID as a parameter. Retrieving it is as easy as calling a hook within components, and React Router / Remix data loaders already allow for easy access to the URL and params.

Alternatives to Consider
Keep it in local storage

Additional context
Suggested by @tobitege