Show warning when trying to navigate away while editing something

[janosrusiczki]

This should work both when clicking and with keyboard shortcuts.

Should set an editing state in pinia and then check with the router. Probably.

[janosrusiczki]

For now keyboard shortcuts are disabled. Swipe shortcuts will also be disabled.

But we should deal with clicking away.

Probably:
if applicationStore.editing == true -> show warning 'You have unsaved changes, are you sure you want to navigate away?'