Redesign SupplierCard and ProductCard, unify components

- SupplierCard: horizontal layout with logo left, verified badge before name, chips at bottom
- ProductCard: add optional sparkline background, trend indicator, and price display
- Replace HubProductCard usage with ProductCard in hub detail page
- Remove HubProductCard.vue and PriceSparkline.vue (unified into ProductCard)

app/pages/catalog/hubs/[id]/index.vue

@@ -26,9 +26,10 @@
     </template>
 
     <template #card="{ item }">
-      <HubProductCard
-        :name="item.name"
+      <ProductCard
+        :product="item"
         :price-history="getMockPriceHistory(item.uuid)"
+        selectable
         @select="goToProduct(item.uuid)"
       />
     </template>