Slash notation in multiple-voice contexts

Your idea

Implement the ability to notate slashes in multi-voice contexts.
Example:

Problem to be solved

Slash notation in multi-voice can be useful when compressing music content when you need to notate the rhythm on fewer staffs. This may seem like a good practice for succinct notation.

There is currently no such option in MuseScore Studio. Regardless of the voice number, all slash elements are placed on the middle line of the staff:

https://github.com/user-attachments/assets/37b49215-0521-42af-9df9-fd5ca57d6253

Prior art

Dorico has such a feature. The user can select individual notes and turn them into slashes. At the same time, a choice is given whether these slashes should be with or without stems.

Additional context

No response

Checklist

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests

The issue names no source files, tests, or entry points. Start by locating the existing slash-notation implementation and how voices position slash elements; the work is done when slash notation can be used in multiple voices and supports the requested stem behavior.