Fix #448 and also allow to change a muted note to a real note

[sbonaime]

Description of Change(s)

Add the option to directly insert a new muted note without requiring a number to be entered first.
Add the option to change a muted note to a regular note with some numbers

Fixes Issue(s)

#448

[Copilot]

Pull request overview

Adds improved tab-entry handling for muted notes (x) to address issue #448 and to allow converting a muted note into a fretted note by typing digits.

Changes:

• Accept x key presses in the tab editor to insert a muted note directly when no note exists at the caret.
• When typing a digit on a muted note, remove the Muted property and apply the typed fret number as a single undoable operation.
• Keep “play note while editing” behavior for numeric entry while skipping playback for muted-note insertion.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[sbonaime]

I have to check Copilot reviews !

[sbonaime]

@cameronwhite What do you think about this PR ?

[cameronwhite]

Sorry for the delay! I've been behind on reviewing PRs :)

[cameronwhite]

My only comment here is that the logic is a bit tricker to follow now:

• if isMutedKey is true and there is already a note, it's not very clear that the intent is to fall through and not handle the key here. An early return might make that more clear?