Implement a "Swing settings" button in the Properties panel instead of the actual "Staff/System text properties" buttons

Your idea

Implement a new Swing settings button (with a new improved panel), instead of the Staff text properties and the non-existent (#21224) System text buttons.
The Staff/System buttons open only the Swing settings, nothing else, so it's logical to rename and delete them accordingly.

Problem to be solved

The creation of a new panel will replace the old one, whose UI wasn't changed to be uniform with the other panels of the same kind and will solve the bug of the top title of the panel, in one instance being "MuseScore4" and in the other "Staff text properties"; it will solve #21224, too.

https://github.com/user-attachments/assets/aa8c62ac-0bfc-49b5-ba66-cb3352589387

Prior art

No response

Additional context

Swing settings are already present in the Style panel.

Checklist

• This request follows the guidelines for reporting issues
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Start by comparing the existing Staff text properties and System text buttons in the Properties panel with the Swing settings already present in the Style panel. Review issue #21224 and the attached examples to define the replacement panel and its title; done means the old buttons are replaced by a consistent Swing settings button and the reported title behavior is resolved.