Pass list name instead of object IDs when available to widgets

Currently only object IDs are passed to list widgets to allow for arbitrary query results not saved as a list to be analysed. When viewing a saved list, we could instead pass the list name and type to the widgets, for a performance improvement.

Start by tracing how saved-list and unsaved query results are passed into list widgets. Confirm where a saved list's name and type are available, while preserving object-ID handling for arbitrary results. Done means saved-list widgets receive the list name and type for analysis and existing unsaved-query behavior remains intact.

Written by the indexing model from the issue text.