fix: improve TypeScript type safety across views

Changes:
- Add proper type annotations for component properties
- Fix null checks with optional chaining
- Add missing interface properties
- Replace any with proper types where possible
- Move interfaces from endorserServer to interfaces/
- Add proper Router and Route typing
- Add default empty string for optional text fields

This improves type safety and reduces TypeScript errors across views.

src/interfaces/claims.ts

@@ -30,7 +30,12 @@ export interface OfferVerifiableCredential extends GenericVerifiableCredential {
   includesObject?: { amountOfThisGood: number; unitCode: string };
   itemOffered?: {
     description?: string;
-    isPartOf?: { identifier?: string; lastClaimId?: string; "@type"?: string };
+    isPartOf?: { 
+      identifier?: string; 
+      lastClaimId?: string; 
+      "@type"?: string;
+      name?: string;
+    };
   };
   offeredBy?: { identifier: string };
   recipient?: { identifier: string };