perf(web): pause hidden live polling

vehicle-data-platform/apps/web/src/v2/queryPolicy.ts

@@ -4,6 +4,14 @@ export const QUERY_MEMORY = {
   summaryGcTime: 60_000
 } as const;
 
+// Live views must not spend traffic while the browser tab is hidden, but they
+// should reconcile immediately when an operator returns instead of waiting for
+// the next interval tick.
+export const LIVE_QUERY_POLICY = {
+  refetchIntervalInBackground: false,
+  refetchOnWindowFocus: true
+} as const;
+
 export function retainPreviousPageWithinScope<T>(scope: string, scopeIndex = 1) {
   return (previous: T | undefined, previousQuery?: { queryKey: readonly unknown[] }) => previousQuery?.queryKey[scopeIndex] === scope ? previous : undefined;
 }