Location reported for unresolved-reference should cover whole reference

It looks like we currently only report the location of `data` here, which is a bit confusing given of course that's the one part of the ref that's never unresolved. We should fix this to have the whole reference covered by the location.

<img width="549" alt="Image" src="https://github.com/user-attachments/assets/9b9f0f1c-18b0-435b-9b21-2444aa0f5d9a" />