feat(store-layout): add checkout redirection on buy button click and update button functionality

src/app/core/layout/store-layout/store-layout.component.html

@@ -18,8 +18,8 @@
         [backgroundColor]="'#ffffff'"
         (closed)="isCartOpen.set(false)"
       >
-        <app-button variant="secondary" class="flex-grow-1">Seguir comprando</app-button>
-        <app-button variant="primary" class="flex-grow-1">Comprar</app-button>
+        <app-button variant="secondary" class="flex-grow-1" (click)="isCartOpen.set(false)">Seguir comprando</app-button>
+        <app-button variant="primary" class="flex-grow-1" (click)="onCheckoutClick()">Comprar</app-button>
       </app-cart>
     </div>
   }

src/app/core/layout/store-layout/store-layout.component.spec.ts

@@ -146,4 +146,26 @@ describe('StoreLayoutComponent', () => {
 
     expect(router.navigate).not.toHaveBeenCalled();
   });
+
+  it('redirects to /checkout when cart buy button is clicked', () => {
+    const router = TestBed.inject(Router);
+    vi.spyOn(router, 'navigate');
+
+    const fixture = TestBed.createComponent(StoreLayoutComponent);
+    fixture.detectChanges();
+
+    fixture.componentInstance.isCartOpen.set(true);
+    fixture.detectChanges();
+
+    const compiled = fixture.nativeElement as HTMLElement;
+    const buyButton = Array.from(compiled.querySelectorAll('app-button button'))
+      .find((button) => button.textContent?.trim() === 'Comprar') as HTMLButtonElement | undefined;
+
+    expect(buyButton).toBeDefined();
+    buyButton!.click();
+    fixture.detectChanges();
+
+    expect(router.navigate).toHaveBeenCalledWith(['/checkout']);
+    expect(fixture.componentInstance.isCartOpen()).toBe(false);
+  });
 });

src/app/core/layout/store-layout/store-layout.component.ts

@@ -89,6 +89,11 @@ export class StoreLayoutComponent implements OnInit {
     }
   }
 
+  protected onCheckoutClick(): void {
+    this.isCartOpen.set(false);
+    void this.router.navigate(['/checkout']);
+  }
+
 
   protected readonly footerSections: StoreFooterSection[] = [
     {