CartService.addItem() fired an async dynamic import + API call for
new items but returned void immediately - buyNow() navigated to /cart
before the item was actually added, landing the user on an empty or
stale cart. addItem() now returns a Promise that resolves once the
cart signal actually contains the item; buyNow() awaits it before
navigating.
Also wired SeoService.setItemMeta()/resetToDefaults() into the product
detail page - built and working, but never called anywhere, so every
product page rendered the site-wide default OG/Twitter tags instead of
per-product ones.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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