Seller App - Prevent navigation away from 'touched' forms

[ArchitectedDev]

When creating a new item or editing an existing item, it's easy to accidently navigate away from the form page and lose unsaved data.

Having a notification to confirm the user wishes to discard unsaved changes will improve the UX of the seller app.

[crhistianramirez]

Seems like an easy add with Angular's CanDeactivateGuard