Fix note moving with ctrl key - #2266

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Nullability of reference types in type of parameter 'obj' of 'int UNote.CompareTo(object obj)' doesn't match implicitly implemented member 'int IComparable.CompareTo(object? obj)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'other' of 'bool UExpressionDescriptor.Equals(UExpressionDescriptor other)' doesn't match implicitly implemented member 'bool IEquatable<UExpressionDescriptor>.Equals(UExpressionDescriptor? other)' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

'JapaneseMonophoneG2p.LoadPack(byte[], Func<string, string>, Func<string, string>)' hides inherited member 'G2pPack.LoadPack(byte[], Func<string, string>, Func<string, string>)'. Use the new keyword if hiding was intended.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.