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
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