fix: resolve type compatibility in offerGiverDid

- Update offerGiverDid to use GenericVerifiableCredential as base type
- Add type assertion for OfferVerifiableCredential inside function
- Remove unnecessary type assertion in canFulfillOffer

src/libs/util.ts

@@ -384,14 +384,15 @@ export function base64ToBlob(base64DataUrl: string, sliceSize = 512) {
  * @param veriClaim is expected to have fields: claim and issuer
  */
 export function offerGiverDid(
-  veriClaim: GenericCredWrapper<OfferVerifiableCredential>,
+  veriClaim: GenericCredWrapper<GenericVerifiableCredential>,
 ): string | undefined {
   let giver;
+  const claim = veriClaim.claim as OfferVerifiableCredential;
   if (
-    veriClaim.claim.offeredBy?.identifier &&
-    !serverUtil.isHiddenDid(veriClaim.claim.offeredBy.identifier as string)
+    claim.offeredBy?.identifier &&
+    !serverUtil.isHiddenDid(claim.offeredBy.identifier as string)
   ) {
-    giver = veriClaim.claim.offeredBy.identifier;
+    giver = claim.offeredBy.identifier;
   } else if (veriClaim.issuer && !serverUtil.isHiddenDid(veriClaim.issuer)) {
     giver = veriClaim.issuer;
   }
@@ -407,7 +408,7 @@ export const canFulfillOffer = (
 ) => {
   return (
     veriClaim.claimType === "Offer" &&
-    !!offerGiverDid(veriClaim as GenericCredWrapper<OfferVerifiableCredential>)
+    !!offerGiverDid(veriClaim)
   );
 };