feat: update session payment logic to ensure accurate payable amounts and reflect consumables in cost breakdown

- Adjusted the calculation of payable amounts in PaymentStep to align with server logic, ensuring overpayments are handled correctly.
- Enhanced DetailsStep to include consumables in the itemized cost breakdown, ensuring consistency with patient share calculations.
- Updated tests for SessionPaymentPage to validate new behavior regarding overpayments and consumable listings.
- Modified PatientController to register SessionPayment correctly when settling sessions via wallet, preventing double charges.
- Refactored WalletService to remove outdated methods and ensure wallet transactions reflect the correct amounts after discounts.
- Improved accessibility in SearchableSelect component by adding aria labels and ensuring proper role attributes for screen readers.
- Updated styles to ensure minimum touch targets meet WCAG guidelines for mobile usability.

assets/admin/lib/api.test.ts

@@ -14,7 +14,8 @@ import { api, ApiError } from '@/lib/api';
 const replaceMock = vi.fn();
 
 function jsonRes(body: unknown, ok = true, status = 200): Response {
-    return { ok, status, json: () => Promise.resolve(body) } as unknown as Response;
+    // headers لازم است: api.ts پیش از خواندن بدنه، Content-Length را برای پاسخ خالی چک می‌کند
+    return { ok, status, headers: new Headers(), json: () => Promise.resolve(body) } as unknown as Response;
 }
 
 function setToken(token: string) {