feat: add time zone support for rent payment and refund processes

- Updated API requests and responses to include time zone information.
- Modified backend services to handle time zone for received and refunded dates.
- Adjusted frontend components to use local date formatting based on the user's time zone.
- Enhanced tests to validate time zone handling in rent payment and refund scenarios.

frontend/src/app/services/rent-payment.service.ts

@@ -47,6 +47,7 @@ export interface RecordRentPaymentRequest {
   rentDueVersion: number;
   receivedAt: string;
   amount: number;
+  timeZone: string;
 }
 
 export interface AllocateRentPaymentRequest {
@@ -62,6 +63,7 @@ export interface RefundRentPaymentRequest {
   paymentVersion: number;
   amount: number;
   refundedAt: string;
+  timeZone: string;
 }
 
 @Injectable({ providedIn: 'root' })