fix(platform-service): 3 bugs in delivery subscribers + survey incentives

- delivery/subscribers: welcome email used raw productId as productName,
  now uses resolveProductName() for proper display name
- delivery/subscribers: remove redundant String(daysLeft) in trial_expiring
- surveys/routes: incentiveClaimed was set outside if(sub) block, marking
  response as claimed even when user has no subscription. Moved inside
  if(sub) so claims are only recorded when incentive is actually granted

services/platform-service/src/modules/delivery/subscribers.ts

@@ -28,7 +28,7 @@ export function registerDeliverySubscribers(
           templateId: 'welcome',
           variables: {
             displayName: event.payload.email.split('@')[0],
-            productName: event.payload.productId,
+            productName: resolveProductName(event.payload.productId),
             dashboardUrl: resolveDashboardUrl(event.payload.productId),
           },
           productId: event.payload.productId,
@@ -168,7 +168,7 @@ export function registerDeliverySubscribers(
           variables: {
             displayName: user.displayName,
             productName: resolveProductName(productId),
-            daysLeft: String(daysLeft),
+            daysLeft,
             upgradeUrl: `${baseUrl}/billing`,
           },
           productId,

services/platform-service/src/modules/surveys/routes.ts

@@ -555,16 +555,16 @@ async function publicRoutes(app: FastifyInstance): Promise<void> {
             tokensIncluded: sub.tokensIncluded + survey.incentive.amount,
           });
         }
-      }
-      incentiveClaimed = true;
-      await repo.updateResponse(id, userId, {
-        incentiveClaimed: true,
-        incentiveClaimedAt: now,
-      });
+        incentiveClaimed = true;
+        await repo.updateResponse(id, userId, {
+          incentiveClaimed: true,
+          incentiveClaimedAt: now,
+        });
 
-      await repo.updateSurveyMetrics(id, productId, {
-        incentiveClaims: survey.metrics.incentiveClaims + 1,
-      });
+        await repo.updateSurveyMetrics(id, productId, {
+          incentiveClaims: survey.metrics.incentiveClaims + 1,
+        });
+      }
     }
 
     return {