Enhance booking and signature functionalities

- Updated MySignaturePage title to Signature

apps/edr-freight-web/backoffice/src/services/bookings.service.ts

@@ -92,6 +92,7 @@ export interface ContractView {
   savedSignature?: {
     signerDisplayName: string;
     signatureImageUrl?: string | null;
+    stampImageUrl?: string | null;
   } | null;
 }
 
@@ -113,6 +114,8 @@ export interface ConsolidationDetails {
 export interface SignContractPayload {
   role: "CUSTOMER" | "STAFF";
   signatureImageBase64: string;
+  /** Company stamp/seal image; the API requires one for CUSTOMER and STAFF. */
+  stampImageBase64?: string;
   signerDisplayName: string;
   consentText?: string;
 }