Currently, after a user submits search text or uses a filter/facet, the <title> of the newly-loaded page is just "Search | {site title}", and the page title (h1) is just "Search Results."

Ideally, this would change to reflect what has been submitted by the user. I think we could at least do this with text input. If the user searches for the text "prairie," for example, when the page reloads, Orchid should make the <title> "Search Results" or (even better) "Search Results: 'prairie'" and the h1 "Search Results: prairie." For faceted/filtered results, it might be more complicated to change the <title>, but we could have the h1 be something like "Search Results: Filtered by Year and Author" or something similar. Not sure.

There's not one right answer on how to do this, but per WCAG 2.1 Level AA guidelines, the page <title> MUST be updated when the web address changes.