refactor(claims): extract offer fulfillment logic to utility function

Created extractOfferFulfillment utility in libs/util.ts to handle both
array and single object cases for fulfills field. Updated ClaimView and
ConfirmGiftView to use the shared utility, eliminating code duplication
and improving maintainability.

src/libs/util.ts

@@ -159,6 +159,41 @@ export const isGiveAction = (
   return isGiveClaimType(veriClaim.claimType);
 };
 
+export interface OfferFulfillment {
+  offerHandleId: string;
+  offerType: string;
+}
+
+/**
+ * Extract offer fulfillment information from the fulfills field
+ * Handles both array and single object cases
+ */
+export const extractOfferFulfillment = (fulfills: any): OfferFulfillment | null => {
+  if (!fulfills) {
+    return null;
+  }
+  
+  // Handle both array and single object cases
+  let offerFulfill = null;
+  
+  if (Array.isArray(fulfills)) {
+    // Find the Offer in the fulfills array
+    offerFulfill = fulfills.find((item) => item["@type"] === "Offer");
+  } else if (fulfills["@type"] === "Offer") {
+    // fulfills is a single Offer object
+    offerFulfill = fulfills;
+  }
+  
+  if (offerFulfill) {
+    return {
+      offerHandleId: offerFulfill.identifier,
+      offerType: offerFulfill["@type"],
+    };
+  }
+  
+  return null;
+};
+
 export const shortDid = (did: string) => {
   if (did.startsWith("did:peer:")) {
     return (