fix: Ads Meta conv/CPL = Clientes potenciales (sin sumar acciones solapadas)

Las creatividades inflaban ~3× al sumar lead + lead_grouped + registration.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/meta-leads.ts

@@ -0,0 +1,20 @@
+/** Meta Ads «Clientes potenciales» ↔ platform_leads (same metric as Ads Manager). */
+
+export function nMeta(v: unknown): number {
+  const x = Number(v);
+  return Number.isFinite(x) ? x : 0;
+}
+
+/**
+ * Exact Ads Manager «Clientes potenciales» for Meta Leads CRM campaigns.
+ * Do not sum lead / lead_grouped / pixel — those overlap and inflate totals.
+ */
+export function leadFromMetaActions(
+  actions?: { action_type?: string; value?: string }[]
+): number {
+  if (!actions?.length) return 0;
+  const primary = actions.find(
+    (a) => a.action_type === 'offsite_complete_registration_add_meta_leads'
+  );
+  return primary ? nMeta(primary.value) : 0;
+}