Added a check in SendMailHandler to prevent sending emails for deleted envelopes with a status of EnvelopeSaved or lower. Updated project version in EnvelopeGenerator.Server.csproj from 1.7.0 to 1.8.0 to reflect these changes.
Switched all audit and creation timestamps from UTC to local time
by replacing DateTime.UtcNow with DateTime.Now across the codebase.
This affects audit fields, object creation, and default values for
date/time properties.
- Added `RealEmailTemplates` property with predefined email templates.
- Populated the repository with these templates in the `Setup` method.
- Ensures tests have consistent, realistic email data available.
