Item info about linked entities

When selecting an Item, show more info about linked entities such as

- creature that drops that item (if any)
- gameobject that drops that item (if any)

etc...

also give the possibility of clicking the linked entity to edit it

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The issue names no files, tests, or entry points, so begin by locating the Item selection view and the existing linked-entity editing flow. Done means linked creatures, gameobjects, and other supported entities are shown when available and can be opened for editing.

Written by the indexing model from the issue text.