add contract hazard declaration, DO collection dates, and booking request currency migrations; implement article body diff component and integrate into contract revision timeline

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

@@ -203,10 +203,12 @@ export const contractsService = {
     id: string,
     validityDays: number,
     documentSnapshot?: Freight.IContractDocumentSnapshot,
+    window?: { validFrom?: string; validUntil?: string },
   ) =>
     postContract<Freight.IContract>(C.STAFF_ACCEPT(id), {
       validityDays,
       documentSnapshot,
+      ...window,
     }),
 
   /** The editable per-contract document draft (snapshot or live template). */