feat(checkout-page): integrate ToastService for error handling in payment intent generation

src/app/features/store/pages/checkout-page/checkout-page.component.ts

@@ -7,6 +7,7 @@ import { CartService } from '../../../../core/services/cart/cart.service';
 import { TenantService } from '../../../../core/services/tenant.service';
 import { CheckoutService, CreatePurchasePayload } from '../../../../core/services/checkout.service';
 import { AuthService } from '../../../../core/services/auth/auth.service';
+import { ToastService } from '../../../../core/services/toast.service';
 import { BankAccount } from '../../../../core/services/tenant.interface';
 import { CartItem } from '../../../../core/services/cart/cart.interface';
 import { CartComponent, CartItemMock } from '../../../../shared/components/cart/cart.component';
@@ -37,6 +38,7 @@ export class CheckoutPageComponent implements OnInit {
   private readonly tenantService = inject(TenantService);
   private readonly checkoutService = inject(CheckoutService);
   private readonly authService = inject(AuthService);
+  private readonly toastService = inject(ToastService);
 
   @ViewChild(StepperComponent) stepper!: StepperComponent;
 
@@ -219,6 +221,13 @@ export class CheckoutPageComponent implements OnInit {
       }
     } catch (error) {
       console.error('Failed to generate payment intent:', error);
+      const backendMessage = (error as { error?: { message?: unknown } } | null)?.error?.message;
+      const message = typeof backendMessage === 'string'
+        ? backendMessage
+        : error instanceof Error
+          ? error.message
+          : 'No pudimos obtener la información de pago. Intentá nuevamente.';
+      this.toastService.danger(message);
     } finally {
       this.isGeneratingIntent.set(false);
     }