feat(catalog): add offers section to InfoPanel after product selection

- Hide products section when product is selected
- Show offers section with OfferCard components
- Add cancel button to return to product list
- Wire up select-offer event to navigate to offer detail

app/pages/catalog/index.vue

@@ -54,6 +54,7 @@
         @add-to-filter="onInfoAddToFilter"
         @open-info="onInfoOpenRelated"
         @select-product="onInfoSelectProduct"
+        @select-offer="onSelectOffer"
         @open-kyc="onOpenKyc"
       />