Checkboxes were previously styled super wonky due to
the usage of checkboxClassName which styled the checkbox
trigger.
This change reverts all that and leaves it with sensible defaults
across dark and light mode.
Adds a new `ownerDocumentCompleted` to the email settings that controls
whether a document will be sent to the owner upon completion.
This was previously the only email you couldn't disable and didn't
account for users integrating with just the API and Webhooks.
Also adds a flag to the public `sendDocument` endpoint which will adjust
this setting while sendint the document for users who aren't using
`emailSettings` on the `createDocument` endpoint.
