Autocomplete shouldn’t show up before typing something

When initially clicking on the search bar, it hits the `/jrs.json` endpoint and returns all results.

Need to correct this so it doesn't trigger the search until the user starts typing something.

Start by tracing the search-bar autocomplete code and the request to `/jrs.json`. Verify the initial click path and then test the behavior with an empty query and with typed input. Done means an empty search does not trigger the endpoint, while typing still loads results.

Written by the indexing model from the issue text.