Custom Field: Set a default option

As a librarian
I want to set a default for a custom field
So that I do not have to set the same value repeatedly

Requirement

• Allow a user to set a default value
• Only applies to non-text box input types
• Optional to set a default value
• Cannot delete an option set as default
• When a user changes the default, do not change any records that has the default set AND saved

• Rough Screenshot of Dropdown custom field with a default option: https://sketch.cloud/s/lw9bd/a/bQel8J

Acceptance Criteria

Given I am on the Create Custom field page
When I set a default option
Then that option should reflect as the default option on a record when creating/editing a record
AND should be the option set for all records that have this field

Given I am on the Edit Custom field page
When I change the default option
THEN do not override any records that selected and saved the previously default option.

Given I am on the Edit Custom field page
When I decide to remove an option
AND that option set as default
Then do not allow me to remove the option
[Will need a UI design for this one]