fix: replace deprecated *ngIf with @if control flow in OTP component

- Migrated all *ngIf directives to modern @if syntax in otp.component.html
- Updated email form, OTP entry, countdown display, and success message conditionals
- Resolves ngtsc deprecation warning 6385 for better Angular 17+ compatibility

src/app/interceptors/auth-interceptor.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { AuthInterceptor } from './auth-interceptor';
+
+describe('AuthInterceptor', () => {
+  beforeEach(() => TestBed.configureTestingModule({
+    providers: [
+      AuthInterceptor
+      ]
+  }));
+
+  it('should be created', () => {
+    const interceptor: AuthInterceptor = TestBed.inject(AuthInterceptor);
+    expect(interceptor).toBeTruthy();
+  });
+});