refactor: replace ignored numeric literals with constants

src/modules/investments/income/income-analytics.service.ts

@@ -30,6 +30,8 @@ import {
   rangeBuckets,
 } from './income-period';
 
+const STALE_FRESHNESS_MS = 0;
+
 type Total = {
   coupon: ReturnType<typeof decimalFromString>;
   dividend: ReturnType<typeof decimalFromString>;
@@ -120,7 +122,7 @@ export class IncomeAnalyticsService {
         fetchedAt: current.meta.lastSuccessfulAt ?
             new Date(current.meta.lastSuccessfulAt) :
           null,
-        freshForMs: current.meta.freshness === 'fresh' ? Infinity : 0,
+        freshForMs: current.meta.freshness === 'fresh' ? Infinity : STALE_FRESHNESS_MS,
         work: work?.id ? { ...work, id: work.id } : null,
         coverage: current.meta.coverage,
         dependencies,