fix(reports): parse DD-MM-YYYY dates strictly in period merges

new Date() mis-read DD-MM-YYYY as MM-DD-YYYY, so multi-bucket periods
(e.g. merged inflow+outflow slices) re-derived cadence from garbage
dates — Aug Zomato showed 12.89 days instead of 0.76. Use the strict
parseOccurredAt() in the cadence branch and dateVal() so first/last
date merges order correctly too.

src/Reports/types.ts

@@ -1,4 +1,5 @@
 import type { FieldConfig, ResourceConfig } from "../../react-openapi";
+import { parseOccurredAt } from "../common/utils/dates";
 
 export interface PeriodMetricsVM {
   outflows: number;
@@ -79,8 +80,11 @@ export function metricLabels(schemas: Record<string, any>): MetricLabel[] {
 }
 
 function dateVal(value: string): number {
-  const t = new Date(value).getTime();
-  return Number.isNaN(t) ? 0 : t;
+  try {
+    return parseOccurredAt(value).getTime();
+  } catch {
+    return 0;
+  }
 }
 
 function bucketMatches(bucket: any, filter: SliceFilter): boolean {
@@ -175,7 +179,13 @@ export function buildPeriodGroups(buckets: any[], filter: SliceFilter): ReportPe
       vm.avg = vm.count ? Math.round((vm.sum / vm.count) * 100) / 100 : null;
       if (acc.sources > 1) {
         const dates = acc.txns
-          .map((t) => new Date(t?.occurred_at ?? "").getTime())
+          .map((t) => {
+            try {
+              return parseOccurredAt(t?.occurred_at).getTime();
+            } catch {
+              return NaN;
+            }
+          })
           .filter((t) => !Number.isNaN(t))
           .sort((a, b) => a - b);
         if (dates.length >= 2) {