feat: implement product detail page and image carousel component

src/app/features/store/components/product-carousel/product-carousel.component.html

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+<div class="product-carousel d-flex flex-column gap-3">
+  <!-- Active/Main Image Area -->
+  <div class="product-carousel__main position-relative bg-light rounded overflow-hidden">
+    <!-- Main Image -->
+    @if (images().length > 0) {
+      <img
+        [src]="images()[activeIndex()]"
+        alt="Product active image"
+        class="product-carousel__main-image w-100 h-100 object-fit-contain"
+      />
+    } @else {
+      <!-- Placeholder -->
+      <div class="product-carousel__placeholder w-100 h-100 d-flex align-items-center justify-content-center text-muted">
+        <i class="fa-solid fa-image fa-3x"></i>
+      </div>
+    }
+
+    <!-- Discount Badge -->
+    @if (discount() && discount()! > 0) {
+      <span class="product-carousel__discount-badge position-absolute top-0 end-0 bg-primary text-white px-3 py-2 fw-semibold">
+        -{{ discount() }}%
+      </span>
+    }
+
+    <!-- Navigation Arrows -->
+    @if (images().length > 1) {
+      <button
+        type="button"
+        class="product-carousel__nav-btn product-carousel__nav-btn--prev position-absolute top-50 translate-middle-y border-0 p-0 d-flex align-items-center justify-content-center"
+        (click)="prevImage()"
+        aria-label="Previous image"
+      >
+        <i class="fa-solid fa-chevron-left"></i>
+      </button>
+
+      <button
+        type="button"
+        class="product-carousel__nav-btn product-carousel__nav-btn--next position-absolute top-50 translate-middle-y border-0 p-0 d-flex align-items-center justify-content-center"
+        (click)="nextImage()"
+        aria-label="Next image"
+      >
+        <i class="fa-solid fa-chevron-right"></i>
+      </button>
+    }
+  </div>
+
+  <!-- Thumbnails Row -->
+  @if (images().length > 1) {
+    <div class="product-carousel__thumbnails d-flex gap-3">
+      @for (image of images(); track image; let idx = $index) {
+        <button
+          type="button"
+          class="product-carousel__thumbnail border-0 p-0 rounded overflow-hidden bg-light"
+          [class.product-carousel__thumbnail--active]="idx === activeIndex()"
+          (click)="selectImage(idx)"
+          [attr.aria-label]="'Select image ' + (idx + 1)"
+        >
+          <img [src]="image" alt="Product thumbnail" class="w-100 h-100 object-fit-contain" />
+        </button>
+      }
+    </div>
+  }
+</div>

src/app/features/store/components/product-carousel/product-carousel.component.scss

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+.product-carousel {
+  width: 100%;
+
+  &__main {
+    aspect-ratio: 1 / 1;
+    width: 100%;
+    background-color: #e0e0e0 !important; /* Matches grey placeholder in mock */
+    border-radius: 8px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+
+  &__main-image {
+    padding: 1rem;
+    transition: transform 0.3s ease;
+  }
+
+  &__placeholder {
+    height: 100%;
+    background-color: #e0e0e0;
+  }
+
+  &__discount-badge {
+    top: 0 !important;
+    right: 0 !important;
+    background-color: var(--tenant-primary, #6376F3) !important;
+    border-bottom-left-radius: 4px;
+    font-size: 0.9rem;
+    letter-spacing: 0.5px;
+    padding: 0.5rem 1rem !important;
+  }
+
+  &__nav-btn {
+    width: 36px;
+    height: 36px;
+    border-radius: 50%;
+    background-color: rgba(0, 0, 0, 0.2) !important;
+    color: #ffffff !important;
+    font-size: 0.9rem;
+    transition: background-color 0.2s ease, transform 0.2s ease;
+    z-index: 10;
+
+    &:hover {
+      background-color: rgba(0, 0, 0, 0.4) !important;
+      transform: translateY(-50%) scale(1.05);
+    }
+
+    &--prev {
+      left: 16px !important;
+    }
+
+    &--next {
+      right: 16px !important;
+    }
+  }
+
+  &__thumbnails {
+    margin-top: 1rem;
+  }
+
+  &__thumbnail {
+    width: 80px;
+    height: 80px;
+    aspect-ratio: 1 / 1;
+    background-color: #e0e0e0 !important; /* Matches mock layout */
+    border-radius: 4px;
+    padding: 0.25rem;
+    transition: opacity 0.2s ease, border-color 0.2s ease;
+    border: 3px solid transparent !important;
+    cursor: pointer;
+
+    img {
+      width: 100%;
+      height: 100%;
+      object-fit: contain;
+    }
+
+    &:hover {
+      opacity: 0.9;
+    }
+
+    &--active {
+      border-color: var(--tenant-primary, #6376F3) !important;
+      opacity: 1;
+    }
+  }
+}

src/app/features/store/components/product-carousel/product-carousel.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { beforeEach, describe, expect, it } from 'vitest';
+import { ProductCarouselComponent } from './product-carousel.component';
+
+describe('ProductCarouselComponent', () => {
+  const mockImages = [
+    'https://example.com/img1.png',
+    'https://example.com/img2.png',
+    'https://example.com/img3.png'
+  ];
+
+  beforeEach(() => {
+    TestBed.resetTestingModule();
+  });
+
+  async function createComponent(images: string[] = [], discount: number | null = null) {
+    await TestBed.configureTestingModule({
+      imports: [ProductCarouselComponent]
+    }).compileComponents();
+
+    const fixture = TestBed.createComponent(ProductCarouselComponent);
+    const component = fixture.componentInstance;
+
+    // Set signals input values
+    fixture.componentRef.setInput('images', images);
+    fixture.componentRef.setInput('discount', discount);
+
+    fixture.detectChanges();
+
+    return { fixture, component };
+  }
+
+  it('should create and start at activeIndex 0', async () => {
+    const { component } = await createComponent(mockImages);
+    expect(component).toBeTruthy();
+    expect(component.activeIndex()).toBe(0);
+  });
+
+  it('should cycle through images on nextImage', async () => {
+    const { component } = await createComponent(mockImages);
+    expect(component.activeIndex()).toBe(0);
+
+    component.nextImage();
+    expect(component.activeIndex()).toBe(1);
+
+    component.nextImage();
+    expect(component.activeIndex()).toBe(2);
+
+    component.nextImage(); // Should wrap around to 0
+    expect(component.activeIndex()).toBe(0);
+  });
+
+  it('should cycle backwards on prevImage', async () => {
+    const { component } = await createComponent(mockImages);
+    expect(component.activeIndex()).toBe(0);
+
+    component.prevImage(); // Should wrap around to end (2)
+    expect(component.activeIndex()).toBe(2);
+
+    component.prevImage();
+    expect(component.activeIndex()).toBe(1);
+  });
+
+  it('should set activeIndex on selectImage', async () => {
+    const { component } = await createComponent(mockImages);
+    expect(component.activeIndex()).toBe(0);
+
+    component.selectImage(2);
+    expect(component.activeIndex()).toBe(2);
+
+    // If out of bounds, should not change
+    component.selectImage(5);
+    expect(component.activeIndex()).toBe(2);
+  });
+
+  it('should render discount badge if provided', async () => {
+    const { fixture } = await createComponent(mockImages, 20);
+    const element = fixture.nativeElement as HTMLElement;
+    const badge = element.querySelector('.product-carousel__discount-badge');
+    expect(badge).not.toBeNull();
+    expect(badge?.textContent?.trim()).toBe('-20%');
+  });
+
+  it('should not render discount badge if not provided', async () => {
+    const { fixture } = await createComponent(mockImages);
+    const element = fixture.nativeElement as HTMLElement;
+    const badge = element.querySelector('.product-carousel__discount-badge');
+    expect(badge).toBeNull();
+  });
+});

src/app/features/store/components/product-carousel/product-carousel.component.ts

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+import { ChangeDetectionStrategy, Component, input, signal } from '@angular/core';
+import { CommonModule } from '@angular/common';
+
+@Component({
+  selector: 'app-product-carousel',
+  standalone: true,
+  imports: [CommonModule],
+  templateUrl: './product-carousel.component.html',
+  styleUrl: './product-carousel.component.scss',
+  changeDetection: ChangeDetectionStrategy.OnPush
+})
+export class ProductCarouselComponent {
+  readonly images = input<string[]>([]);
+  readonly discount = input<number | null>(null);
+
+  readonly activeIndex = signal(0);
+
+  nextImage(): void {
+    const total = this.images().length;
+    if (total > 0) {
+      this.activeIndex.set((this.activeIndex() + 1) % total);
+    }
+  }
+
+  prevImage(): void {
+    const total = this.images().length;
+    if (total > 0) {
+      this.activeIndex.set((this.activeIndex() - 1 + total) % total);
+    }
+  }
+
+  selectImage(index: number): void {
+    const total = this.images().length;
+    if (index >= 0 && index < total) {
+      this.activeIndex.set(index);
+    }
+  }
+}