fix(kilo-pass): clean up email dedup marker when user has no email

When user.google_user_email is falsy in maybeSendDuplicateCardCanceledEmail,
the transactional_email_log marker was left in the DB permanently. This
suppressed future email sends even if the user later acquired an email.
Now the marker is deleted before returning, consistent with the error-path
cleanup logic.

Author: jrf0110

apps/web/src/lib/kilo-pass/card-fingerprint-gate.ts

@@ -270,7 +270,17 @@ export async function maybeSendDuplicateCardCanceledEmail(params: {
       where: eq(kilocode_users.id, kiloUserId),
     });
 
-    if (!user?.google_user_email) return;
+    if (!user?.google_user_email) {
+      await db
+        .delete(transactional_email_log)
+        .where(
+          and(
+            eq(transactional_email_log.email_type, KILO_PASS_DUPLICATE_CARD_EMAIL_TYPE),
+            eq(transactional_email_log.idempotency_key, stripeInvoiceId)
+          )
+        );
+      return;
+    }
 
     const sendResult = await sendKiloPassDuplicateCardCanceledEmail(user.google_user_email, {});