fix(claims): handle single Offer object in fulfills field

Updated extractOfferFulfillment to support both array and single object
cases for the fulfills field. Previously only handled array format,
now also checks if fulfills is a single Offer object with @type "Offer".

src/views/ClaimView.vue

@@ -739,13 +739,18 @@ export default class ClaimView extends Vue {
     }
 
     const fulfills = this.detailsForGive.fullClaim.fulfills;
-    if (!Array.isArray(fulfills)) {
-      this.detailsForGiveOfferFulfillment = null;
-      return;
-    }
     
+    // Handle both array and single object cases
+    let offerFulfill = null;
+    
+    if (Array.isArray(fulfills)) {
       // Find the Offer in the fulfills array
-    const offerFulfill = fulfills.find((item) => item["@type"] === "Offer");
+      offerFulfill = fulfills.find((item) => item["@type"] === "Offer");
+    } else if (fulfills["@type"] === "Offer") {
+      // fulfills is a single Offer object
+      offerFulfill = fulfills;
+    }
+    
     if (offerFulfill) {
       this.detailsForGiveOfferFulfillment = {
         offerHandleId: offerFulfill.identifier,