Duplicate email sent when approving from Full Review

Repro Steps:

1. Find or add a new host app that is in Full Review and where your email is the submitter
2. Login as an Examiner
3. Find and open the app
4. Click on the [Approve] button
5. Wait for email to arrive

Actual:
Two identical emails arrive at the same time
Both for the same addr and the same email body

Expected:
Only 1 email should be sent by the system to the email entered in the app

Start by reproducing the Full Review approval flow described in the issue, then trace where the approval triggers email dispatch. Identify why the same message is sent twice and add a regression check for the approval path. Done means approving an app sends exactly one email to the submitter.

Written by the indexing model from the issue text.