Support custom fonts (e.g., Microsoft YaHei) in the editor on Windows

What problem are you facing?

The editor currently doesn't support custom fonts. I use Notesnook on Windows and would like to set "Microsoft YaHei" as the editor font, since it displays Chinese/CJK text more clearly than the current default options.

What's the solution you'd like to see in Notesnook?

Allow users to select any font installed on their system (not just a predefined list) under Settings > Customization > Editor, so fonts like Microsoft YaHei can be applied.

What alternatives have you considered?

No response

Additional context

This would be especially helpful for users who write notes that mix English and other languages (e.g., Chinese), where system fonts like Microsoft YaHei improve readability significantly.