fix(stepper): add disabled state to prevent navigation and provide visual feedback

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

@@ -6,7 +6,11 @@
 } @else {
   <div class="checkout-page">
     <div class="checkout-page__stepper-col">
-      <app-stepper #stepper [initialStepIndex]="checkoutStepIndex()">
+      <app-stepper
+        #stepper
+        [initialStepIndex]="checkoutStepIndex()"
+        [disabled]="hasSubmittedTransfer()"
+      >
         <app-step label="Datos" [isValid]="isStep1Valid()">
           <app-checkout-data-step
             [form]="form"

src/app/shared/components/stepper/stepper.component.html

@@ -1,25 +1,27 @@
 <div class="stepper-container">
-
   <!-- Horizontal indicator bar -->
-  <div class="stepper-header">
+  <div class="stepper-header" [class.is-disabled]="disabled()" [attr.aria-disabled]="disabled()">
     @for (step of steps(); track step; let i = $index; let last = $last) {
       <div
         class="stepper-header__item"
         [ngClass]="{
           'is-active': currentStepIndex() === i,
-          'is-completed': currentStepIndex() > i
+          'is-completed': currentStepIndex() > i,
         }"
       >
         <!-- Connecting line before (except first) -->
         @if (i > 0) {
-          <div class="stepper-header__line" [ngClass]="{ 'is-completed': currentStepIndex() > i - 1 }"></div>
+          <div
+            class="stepper-header__line"
+            [ngClass]="{ 'is-completed': currentStepIndex() > i - 1 }"
+          ></div>
         }
 
         <!-- Circle indicator -->
         <div
           class="stepper-header__circle"
           [attr.aria-label]="step.label()"
-          [class.is-clickable]="currentStepIndex() > i"
+          [class.is-clickable]="!disabled() && currentStepIndex() > i"
           (click)="goToStep(i)"
         ></div>
 
@@ -33,5 +35,4 @@
   <div class="stepper-body">
     <ng-content></ng-content>
   </div>
-
 </div>

src/app/shared/components/stepper/stepper.component.scss

@@ -13,6 +13,14 @@
   margin-bottom: 2rem;
   position: relative;
 
+  &.is-disabled {
+    opacity: 0.5;
+
+    .stepper-header__circle {
+      cursor: not-allowed;
+    }
+  }
+
   &__item {
     display: flex;
     flex-direction: column;

src/app/shared/components/stepper/stepper.component.spec.ts

@@ -6,7 +6,7 @@ import { StepComponent } from './step.component';
 @Component({
   imports: [StepperComponent, StepComponent],
   template: `
-    <app-stepper #stepper>
+    <app-stepper #stepper [disabled]="stepperDisabled()">
       <app-step label="Step 1" [isValid]="step1Valid()">
         <div id="content-1">Content 1</div>
       </app-step>
@@ -20,6 +20,7 @@ class TestHostComponent {
   @ViewChild('stepper') stepper!: StepperComponent;
   step1Valid = signal(true);
   step2Valid = signal(true);
+  stepperDisabled = signal(false);
 }
 
 describe('StepperComponent & StepComponent', () => {
@@ -137,4 +138,28 @@ describe('StepperComponent & StepComponent', () => {
     expect(component.stepper.currentStepIndex()).toBe(0);
     expect(fixture.nativeElement.querySelector('#content-1')).not.toBeNull();
   });
+
+  it('blocks all navigation and shows visual feedback while disabled', async () => {
+    const { fixture, component } = await setup();
+    component.stepperDisabled.set(true);
+    fixture.detectChanges();
+
+    component.stepper.next();
+    expect(component.stepper.currentStepIndex()).toBe(0);
+
+    component.stepperDisabled.set(false);
+    fixture.detectChanges();
+    component.stepper.next();
+    expect(component.stepper.currentStepIndex()).toBe(1);
+
+    component.stepperDisabled.set(true);
+    fixture.detectChanges();
+    component.stepper.previous();
+    component.stepper.goToStep(0);
+
+    expect(component.stepper.currentStepIndex()).toBe(1);
+    const header = fixture.nativeElement.querySelector('.stepper-header');
+    expect(header.classList.contains('is-disabled')).toBe(true);
+    expect(header.getAttribute('aria-disabled')).toBe('true');
+  });
 });

src/app/shared/components/stepper/stepper.component.ts

@@ -18,9 +18,12 @@ import { NgClass } from '@angular/common';
 export class StepperComponent {
   readonly steps = contentChildren(StepComponent);
   readonly initialStepIndex = input(0);
+  readonly disabled = input(false);
   readonly currentStepIndex = linkedSignal(() => this.initialStepIndex());
 
   next() {
+    if (this.disabled()) return;
+
     const currentSteps = this.steps();
     const currentIndex = this.currentStepIndex();
     if (currentIndex < currentSteps.length - 1) {
@@ -32,6 +35,8 @@ export class StepperComponent {
   }
 
   previous() {
+    if (this.disabled()) return;
+
     const currentIndex = this.currentStepIndex();
     if (currentIndex > 0) {
       this.currentStepIndex.set(currentIndex - 1);
@@ -39,6 +44,8 @@ export class StepperComponent {
   }
 
   goToStep(index: number) {
+    if (this.disabled()) return;
+
     const targetIndex = index;
     // Only allow navigating to completed steps or the current one
     if (targetIndex < this.currentStepIndex()) {