fix(annotations): include bounding box coordinates in mapped signature and frame data

- Added extraction of `x`, `y`, `width`, and `height` from annotations and frames in `mapSignature`.
- Ensures positional data is correctly preserved when mapping signatures and frames from PSPDFKit annotations.
- No functional changes to annotation creation, deletion, or validation.

EnvelopeGenerator.Web/wwwroot/js/annotation.js

@@ -321,7 +321,7 @@ function mapSignature(iJSON) {
         // formFields
         ...iJSON.formFieldValues.filter(field => !field.name.includes("label")).map((field) => {
             const nameParts = field.name.split('#');
-            const [x, y, width, height] = iJSON.annotations.find(iAnnot => iAnnot.id === field.name)?.bbox;
+            const [x, y, width, height] = iJSON.annotations.find(iAnnot => iAnnot.id === field.name).bbox;
             return {
                 elementId: Number(nameParts[2]),
                 name: nameParts[3],
@@ -340,11 +340,16 @@ function mapSignature(iJSON) {
                 field => field.id.includes("signature") && field.pageIndex === annot.pageIndex
             ));
             const idPartsOfPre = preElement.id.split('#');
+            const [x, y, width, height] = annot.bbox;
             return {
                 elementId: Number(idPartsOfPre[2]),
                 name: 'frame',
                 value: fixBase64(iJSON.attachments[annot.imageAttachmentId]?.binary),
-                type: annot.type
+                type: annot.type,
+                x: x,
+                y: y,
+                width: width,
+                height: height
             };
         }),
 
@@ -366,11 +371,16 @@ function mapSignature(iJSON) {
             else
                 throw new Error("Signature mapping failed: The data structure from the third-party library is incompatible or missing required fields.");
 
+            const [x, y, width, height] = annot.bbox;
             return {
                 elementId: Number(idPartsOfPre[2]),
                 name: 'signature',
                 value,
-                type: annot.type
+                type: annot.type,
+                x: x,
+                y: y,
+                width: width,
+                height: height
             };
         })
     ];