Changing header Y-offset doesn't work symmetrically to footer Y-offset

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

Let's start with footer at default position.

Change the Y-offset of the footer in Style:

1. if you increase it, the footer will just go outside the page, (correctly) moving indipendently from the rest of the score
   

2. if you decrease it, the footer will (correctly, again) "push up" the lower staff in order to avoid collision:
   

Now, let's try with the header, with its default position and "mirroring" the actions we did with the footer:

1. if you increase the Y-offset, the header will just trespass the first staff, without avoiding any collision:
   

2. if you decrease the Y-offset, the header will move outside the page (as expected), but it will "push down" the first staff as it would be expected for case 1.
   

Supporting files, videos and screenshots

Footer correct behaviour:

https://github.com/user-attachments/assets/f6e7c85b-3274-444c-8934-3cc353661c8d

Header incorrect behaviour:

https://github.com/user-attachments/assets/5cab3be7-7e79-4db4-ba88-19a6e25f063b

In which versions of MuseScore Studio is this issue present?

4.0.2–4.7.5

Regression

No

Operating system

Windows 11

Additional context

No response

Checklist

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• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible