Reduce duplicate terminal detail loads

frontend/components/dashboard/scan-terminal/__tests__/refreshCadencePolicy.test.ts

@@ -102,6 +102,10 @@ export async function runTests() {
       chartLogicSource.includes("primeCityDetailCache"),
     "visible terminal chart detail fetches should be coalesced into one batch request and prime the shared chart cache",
   );
+  assert(
+    chartLogicSource.includes("CITY_DETAIL_BATCH_WINDOW_MS = 100"),
+    "visible terminal chart detail fetches should use a wide enough batch window to coalesce cards mounted across adjacent frames",
+  );
   assert(
     chartLogicSource.includes("partial?: boolean") &&
       chartLogicSource.includes("missing?: string[]"),

frontend/components/dashboard/scan-terminal/__tests__/ssePatchArchitecture.test.ts

@@ -198,8 +198,9 @@ export function runTests() {
   assert(
     foregroundRefreshBlock.includes("ignoreCache: true") &&
       foregroundRefreshBlock.includes("fetchHourlyForecastForCity") &&
+      foregroundRefreshBlock.includes("FOREGROUND_FULL_DETAIL_REFRESH_DEDUP_MS") &&
       !foregroundRefreshBlock.includes("setIsHourlyLoading(true)"),
-    "foreground resume refresh should update full detail immediately in the background without showing the loading overlay",
+    "foreground resume refresh should update full detail in the background without showing the loading overlay or refetching fresh detail",
   );
   assert(
     !chart.includes("/api/city/${encodeURIComponent(city)}/summary"),