Refactor EnvelopeDto and add EnvelopeStatus enum

Updated the `EnvelopeDto` class to use a simplified receiver model (`EnvelopeReceiverSimpleDto`) for streamlined data handling. Added the `EnvelopeReceiverSimpleDto` class to represent basic receiver information (`Name`, `Email`, `Signed`).

Introduced the `EnvelopeStatus` enumeration in `EnvelopeStatus.cs` to define envelope lifecycle statuses, repurposed for the `ReceiverUI` context. Added `EnvelopeStatusExtensions` with `IsActive` and `IsCompleted` methods to evaluate envelope status states.

EnvelopeGenerator.ReceiverUI/Models/EnvelopeDto.cs

@@ -20,5 +20,20 @@ public class EnvelopeDto
     public byte[]? DocResult { get; set; }
 
     [JsonPropertyName("envelopeReceivers")]
-    public List<EnvelopeReceiverDto> EnvelopeReceivers { get; set; } = new();
+    public List<EnvelopeReceiverSimpleDto> EnvelopeReceivers { get; set; } = new();
+}
+
+/// <summary>
+/// Simplified receiver model for envelope list display
+/// </summary>
+public class EnvelopeReceiverSimpleDto
+{
+    [JsonPropertyName("name")]
+    public string? Name { get; set; }
+
+    [JsonPropertyName("email")]
+    public string? Email { get; set; }
+
+    [JsonPropertyName("signed")]
+    public bool Signed { get; set; }
 }

EnvelopeGenerator.ReceiverUI/Models/EnvelopeStatus.cs

@@ -0,0 +1,33 @@
+namespace EnvelopeGenerator.ReceiverUI.Models;
+
+/// <summary>
+/// Envelope status enumeration (copied from Domain for ReceiverUI)
+/// </summary>
+public enum EnvelopeStatus
+{
+    Invalid = 0,
+    EnvelopeCreated = 1001,
+    EnvelopeSaved = 1002,
+    EnvelopeQueued = 1003,
+    EnvelopeSent = 1004,
+    EnvelopePartlySigned = 1005,
+    EnvelopeCompletelySigned = 1006,
+    EnvelopeReportCreated = 1007,
+    EnvelopeArchived = 1008,
+    EnvelopeDeleted = 1009,
+    EnvelopeRejected = 10007,
+    EnvelopeWithdrawn = 10009
+}
+
+public static class EnvelopeStatusExtensions
+{
+    public static bool IsActive(this EnvelopeStatus status)
+    {
+        return status >= EnvelopeStatus.EnvelopeCreated && status < EnvelopeStatus.EnvelopePartlySigned;
+    }
+
+    public static bool IsCompleted(this EnvelopeStatus status)
+    {
+        return status >= EnvelopeStatus.EnvelopeCompletelySigned && status <= EnvelopeStatus.EnvelopeWithdrawn;
+    }
+}