Find References and Highlights should work on module parameters and outputs

The logic for find refs and highlights should be identical - they are just two different ways to visualize the same information.

No files, tests, or entry points are named in the issue. Start by locating the implementations for find references and highlights, then trace how module parameters and outputs are handled. Done means both features use identical logic and support those module elements consistently.

Written by the indexing model from the issue text.