Percussion keyboard shortcuts

[mathesoncalum]

This PR implements our new-and-improved percussion shortcuts. After these changes, it will be possble to use keys beyond ABCDEFG to input percussion notes.



PR Overview

As outlined in the spec for this task, choosing “Define keyboard shortcut” from the percussion panel or editing shortcuts from the Customize kit dialog should prompt the user for an updated shortcut.

While the current flow provided by EditShortcutModel is quite similar to that of the new spec, it's clear that a more specialised model is required for percussion shortcuts (adding extra percussion-specific logic to EditShortcutModel probably wouldn't be appropriate/coherent, especially considering it's part of the framework module). The logic we're interested in also requires some decoupling from preferences.

To address this, 7984f8b extracts the content of our current EditShortcutDialog into an EditShortcutDialogContent component which can be re-used with other models across the application.

 The second commit here (7219ade) implements the EditPercussionShortcutDialog with an associated EditPercussionShortcutModel and provides a logic for opening it in PercussionUtilities.

Commit 6e4ba68 replaces the current shortcut dropdown in the customize kit dialog with a button that triggers the new flow, while commits cff5256 and 4fa176c lay the groundwork for actually using the expanded range of shortcuts for note input.

Next Steps

This isn't merge-ready yet. While this PR currently provides the logic/UI to assign expanded percussion shortcuts, they aren't usable without some tweaking to our note input logic. This will inevitably overlap with some other 4.5 tasks that are currently in-progress - the plan at the moment is to merge the other tasks before attempting the necessary tweaks here.

[Eism]

let's move it to separate file

[Eism]

2025 :)