feat: wire affiliate_link_clicked event in product detail page

app/(app)/(builder)/parts/p/[platform]/[partRole]/[productSlug]/page.tsx

@@ -6,6 +6,7 @@ import { useParams, useRouter, useSearchParams } from "next/navigation";
 
 import type { BuilderSlotKey } from "@/types/builderSlots";
 import { PART_ROLE_TO_CATEGORY, normalizePartRole } from "@/lib/catalogMappings";
+import { trackAffiliateLinkClicked } from "@/lib/analytics";
 
 /**
  * API Shapes
@@ -699,6 +700,7 @@ export default function ProductDetailsPage() {
                                     target="_blank"
                                     rel="noreferrer"
                                     className="inline-flex items-center justify-center rounded-md bg-amber-400 px-3 py-1.5 text-xs font-semibold text-black hover:bg-amber-300"
+                                    onClick={() => trackAffiliateLinkClicked(product?.name ?? "", o.merchantName ?? "")}
                                   >
                                     Buy
                                   </a>
@@ -726,6 +728,7 @@ export default function ProductDetailsPage() {
                         target="_blank"
                         rel="noreferrer"
                         className="rounded-md border border-zinc-700 bg-zinc-900/70 px-4 py-2 text-sm font-semibold text-zinc-200 hover:bg-zinc-800"
+                        onClick={() => trackAffiliateLinkClicked(product?.name ?? "", merchantLabel(bestOffer))}
                       >
                         Buy from {merchantLabel(bestOffer)} →
                       </a>