Next Demo: React UI library integration (part 1)

[jmderby]

Description

This PR 100% depends on jonathan/client-sdk-react-ui-auth-provider and contains the changes to use the new hook and auth provider.

This PR also contains various UI tweaks to correspond to the mock design better, thanks to the help of Pablo.

Test plan

Regular demo flow still works as expected.

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 9278b5db2581d47d2fa2e3c732fae8d103ed2307

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR