Fretboard diagram properties: Accept T, t, P, and p as valid fingerings

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

Currently, only numeric characters 1-5 are valid entries for fingerings on fretboard diagrams. "T" and "t" should also be accepted, to indicate "thumb" (example below) as well as "P" and "p" for pulgar as pointed out here.

Supporting files, videos and screenshots

I should be able to enter "T" in this box.

What is the latest version of MuseScore Studio where this issue is present?

4.4 Nightly

Regression

No.

Operating system

macOS 14.5

Additional context

No response

Checklist

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