warn in leaving edit mode if unsaved changes

Ticket

warn in leaving edit mode if unsaved changes+status

warn in leaving edit mode if unsaved changes+priority

warn in leaving edit mode if unsaved changes+tag

warn in leaving edit mode if unsaved changes+commit

warn in leaving edit mode if unsaved changes+solution

Whether by browser action or clicking another tab, closing the card, any other ways we leave Edit mode?

warn in leaving edit mode if unsaved changes+discussed in support tickets