- Updated `CreateEnvelopeReceiverCommand` to specify response type for `IRequest`.
- Enhanced `CreateEnvelopeReceiverCommandHandler` to use `AutoMapper` and return `CreateEnvelopeReceiverResponse`.
- Modified `Handle` method to map envelope data and populate recipient lists.
- Changed `CreateEnvelopeReceiverResponse` to inherit from `CreateEnvelopeResponse` and added new properties.
- Adjusted mapping profile to map `Envelope` to `CreateEnvelopeReceiverResponse`.
- Created new mapping profile for `Receiver` to `ReceiverReadDto`.
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