refactor(BurnPdfCommandHandler): deserialize and process instant JSON annotations

- Added Newtonsoft.Json to parse instant JSON into `InstantData`.
- Replaced `AddInstantJSONAnnotationToPDF` logic with `AddInstantJsonAnnotationToPdf`.
- Process annotations by type (Image, Ink, Widget) and apply attachments/form fields.
- Introduced checks for ignored form field values using `_pdfBurnerParams.IgnoredLabels`.
- Added logging for annotation IDs when processing instant JSON.

EnvelopeGenerator.Application/Pdf/BurnPdfCommand.cs

@@ -8,6 +8,7 @@ using GdPicture14;
 using MediatR;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
 
 namespace EnvelopeGenerator.Application.Pdf;
 
@@ -183,7 +184,8 @@ public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand>
         {
             try
             {
-                AddInstantJSONAnnotationToPDF(oJSON);
+                if (oJSON is string json)
+                    AddInstantJsonAnnotationToPdf(json);
             }
             catch (Exception ex)
             {
@@ -212,9 +214,42 @@ public class BurnPdfCommandHandler : IRequestHandler<BurnPdfCommand>
         return oNewStream.ToArray();
     }
 
-    private void AddInstantJSONAnnotationToPDF(string pInstantJSON)
+    private void AddInstantJsonAnnotationToPdf(string instantJson)
     {
-        throw new NotImplementedException();
+        var annotationData = JsonConvert.DeserializeObject<InstantData>(instantJson);
+
+        annotationData?.Annotations?.Reverse();
+
+        if (annotationData?.Annotations is null)
+            return;
+
+        foreach (var annotation in annotationData.Annotations)
+        {
+            _logger.LogDebug("Adding AnnotationID: {id}", annotation.Id);
+
+            switch (annotation.Type)
+            {
+                case AnnotationType.PSPDFKit.Image:
+                    if (annotationData?.Attachments is not null)
+                        AddImageAnnotation(annotation, annotationData.Attachments);
+                    break;
+
+                case AnnotationType.PSPDFKit.Ink:
+                    AddInkAnnotation(annotation);
+                    break;
+
+                case AnnotationType.PSPDFKit.Widget:
+                    // Add form field values
+                    var formFieldValue = annotationData?.FormFieldValues?
+                        .FirstOrDefault(fv => fv.Name == annotation.Id);
+
+                    if (formFieldValue != null && !_pdfBurnerParams.IgnoredLabels.Contains(formFieldValue.Value))
+                    {
+                        AddFormFieldValue(annotation, formFieldValue);
+                    }
+                    break;
+            }
+        }
     }
 
     private void AddFormFieldValue(double x, double y, double width, double height, int page, string value)