Right clicking the page and opening the browser's context menu breaks the app

[GabrielMajeri]

I've accidentally right-clicked the app's UI and opened a context menu:

And that seems to have broken the app, since I cannot move the screen or zoom in/out anymore in View mode, nor does Edit mode do anything 😅

[mehanix]

Context menu access should actually be disabled. Would love it if someone could actually take a look and implement this since it shouldn't be too difficult. I'll leave this as a good first issue.