fix(storefront): composition audit fixes for cart, catalog, product, compare, wishlist, static pages

- Replace hand-rolled loading/error/empty markup with shared app-skeleton,
  app-empty-state, and app-button across catalog, product details, cart,
  compare, wishlist, and the public static-page renderer
- Fix hardcoded hex colors that bypassed theme CSS variables (catalog,
  product details), restoring multi-tenant theme correctness
- Remove ~1100 lines of dead "alt" cart theme CSS (never applied by the
  template) from cart.component.scss, bringing it back under the 40kB
  build budget (89.49kB -> 59.39kB cart-component chunk)
- Swap legacy global .btn/.btn-ghost/.btn-primary classes for app-button
  in compare and wishlist empty/toolbar actions

src/app/pages/static-page/static-page.component.ts

@@ -6,11 +6,14 @@ import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { StaticPageResolverService } from '../../core/config/static-page-resolver.service';
 import { LanguageService } from '../../services/language.service';
 import { TranslatePipe } from '../../i18n/translate.pipe';
+import { EmptyStateComponent } from '../../shared/ui/empty-state/empty-state.component';
+import { SkeletonComponent } from '../../shared/ui/skeleton/skeleton.component';
+import { ButtonComponent } from '../../shared/ui/button/button.component';
 
 @Component({
   selector: 'app-static-page',
   standalone: true,
-  imports: [CommonModule, RouterLink, TranslatePipe],
+  imports: [CommonModule, RouterLink, TranslatePipe, EmptyStateComponent, SkeletonComponent, ButtonComponent],
   templateUrl: './static-page.component.html',
   styleUrls: ['./static-page.component.scss'],
   changeDetection: ChangeDetectionStrategy.OnPush