Feature cn 107 prevent data loss

[mandolyte]

Describe what your pull request addresses

This is integration work to use an unsaved data callback now available in the uw-editor component.

• [ ] When a card is closed and there are unsaved changes to the book, then a dialog will appear
• [ ] This dialog will warn them and offer two choices, Continue (which closes the card) and Cancel (which returns the user to the card so they can click the save button).

Test Instructions

• [ ] Open a book for which you have update permissions
• [ ] Make a change
• [ ] Click the "X" on the card to close
• [ ] Observe that a dialog appears informing the user that they have unsaved changes
• [ ] If they click Cancel, the dialog simply disappears (then they can click save if they want to save it)
• [ ] If they click Continue, the dialog and the card will disappear
• [ ] Click to close the tab, a warning message is shown allowing the user to return
• [ ] Click to close the browser, a warning message is shown -- however, the app appears to be reset. Data may be lost?

NOTE: that if the book is re-opened, the data is there with the changes intact. However, the save button is not enabled. This is a bug? Workaround is to click the undo (which is enabled) and then redo. Then click save.

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[mandolyte]

The updates address the tab closing, but closing the entire browser seems to work differently. I updated the test instructions. Let me know what you think.

I got the Nextjs example and pretty much pasted it into /pages/_app.js. I commented out the parts I did not think we needed, but left them there since the other conditions handled might prove useful.