Release list: close after a successful grab

Back to where the search started (library, drill-down or search), unless
something was opened on top of the list meanwhile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/ui/releases.go

@@ -269,6 +269,7 @@ func (v *releasesView) doGrab(r arr.Release) {
 				return
 			}
 			v.app.SetMessage("[green]Sent to the download client: " + tview.Escape(truncate(r.Title, 60)))
+			v.app.closeIfTop(v.root) // done here: back to where the search started
 		})
 	}()
 }