Function build_latest_items_endpoint 

fn build_latest_items_endpoint(
    user_id: &str,
    parent_id: &str,
    limit: Option<usize>,
) -> String

Build the Jellyfin endpoint for a “recently added” listing.

GroupItems=true is the load-bearing parameter: Jellyfin defaults it to false, which returns each newly-added leaf separately, so importing one 14-track album pushed 14 rows into “recently added” and buried everything else. With grouping on, the server collapses children into the container that was added — an album appears once, while movies (which have no such container) are unaffected.

Pulled out of get_latest_items so the query can be asserted without an HTTP server, matching build_favorites_endpoint.

TRACES: UR-024, UR-034 | IR-024, JA-016