feat(platform): preserve customer time window in tasks

vehicle-data-platform/apps/web/src/pages/Mileage.tsx

@@ -14,6 +14,23 @@ const emptySummary: MileageSummary = {
   averageMileagePerVin: 0
 };
 
+function numberOrZero(value: unknown) {
+  const numeric = Number(value);
+  return Number.isFinite(numeric) ? numeric : 0;
+}
+
+function normalizeMileageSummary(summary?: Partial<MileageSummary> | null): MileageSummary {
+  return {
+    ...emptySummary,
+    ...(summary ?? {}),
+    vehicleCount: numberOrZero(summary?.vehicleCount),
+    recordCount: numberOrZero(summary?.recordCount),
+    sourceCount: numberOrZero(summary?.sourceCount),
+    totalMileageKm: numberOrZero(summary?.totalMileageKm),
+    averageMileagePerVin: numberOrZero(summary?.averageMileagePerVin)
+  };
+}
+
 const emptyOnlineSummary: OnlineStatisticsSummary = {
   vehicleCount: 0,
   onlineVehicleCount: 0,
@@ -940,7 +957,7 @@ export function Mileage({
   const loadSummary = (values: Record<string, string> = filters) => {
     setSummaryLoading(true);
     api.mileageSummary(mileageParams(values))
-      .then((nextSummary) => setSummary(nextSummary ?? emptySummary))
+      .then((nextSummary) => setSummary(normalizeMileageSummary(nextSummary)))
       .catch((error: Error) => Toast.error(error.message))
       .finally(() => setSummaryLoading(false));
     api.onlineStatisticsSummary(mileageParams(values))