snooze vor expired, contracts, display snoozed contracts if an item is missing, un snooze implemented, fixed invoice upload bug

frontend/src/types/index.ts

@@ -335,6 +335,8 @@ export interface Contract {
   mobileDetails?: MobileContractDetails;
   tvDetails?: TvContractDetails;
   carInsuranceDetails?: CarInsuranceDetails;
+  // Snooze: Vertrag zurückstellen
+  nextReviewDate?: string;
   followUpContract?: {
     id: number;
     contractNumber: string;
@@ -500,8 +502,10 @@ export interface CockpitSummary {
     contractEnding: number;
     missingCredentials: number;
     missingData: number;
+    missingInvoices: number;
     openTasks: number;
     pendingContracts: number;
+    reviewDue: number;
   };
 }