'Show Normal Maps' as an option in 'View'

'Show Normal Maps' as an option in 'View' would be pretty helpful for developers to spot imperfections in their tileset normal maps. The option could go just under these two, and the shortcut could be Ctrl+Shift+N.

<img width="712" height="145" alt="Image" src="https://github.com/user-attachments/assets/f2defb03-fe60-4fd0-bdae-4056cc189b9a" />