Mobile Shop App : leave comments with order

Allow the customer's order to have comments written before submission. Comments could be seen by the merchant (i.e.: _remove onions from my menu_) and the carrier (i.e.: _watch out the dog when ringing the doorbell_)

We can put small (tiny!) button above "Undo" / "Pay with Card" with the text "Leave Notes" (color like grey or something that not stand out too much)

Same changes we should do on full page view:


Click on such Button "Leave Notes" will show a tiny popup with 2 choices:
[Note to Merchant]
[Note to Carrier]

Click "Note to Merchant" above, will show another popup with "Note to Merchant" title and 3 lines input for "Note" and buttons "Submit" and "Cancel". The same should be done for "Note to Carrier". Of course, click again on "Note to Merchant" or "Note to Carrier" should show a popup with a previously entered note and allow it to edit it and submit again.

Notes should be added to order record in Merchant Tablet app, to Carrier app page where delivery information displayed and of course in Admin UI for selected Order.