Added `OnlyActive` and `OnlyCompleted` properties to the `ReadEnvelopeQuery` class to enable filtering envelopes by their active or completed status. Updated the `ReadEnvelopeQueryHandler` to apply these filters when the properties are set.
Enhanced the `EnvelopeStatus` class by introducing `Active` and `Completed` status lists and adding extension methods (`IsActive` and `IsCompleted`) to determine status categories. Included necessary `using` directives for `System` and `System.Linq`.
TekH
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