Review Admin UI for final polish

[jeffpaul]

Before we ship this externally, we'll want to ensure someone does a review for polish within the admin UI. Creating this placeholder issue to capture actual issues found, tentatively by @helen later this month.

[ryanwelcher]

@helen our staging environment has the latest changes for review - https://klasifai.10uplabs.com/wp-admin/options-general.php?page=classifai_settings

[ryanwelcher]

@helen I've pushed the notification updates to staging as well.