Optimize terminal detail loading and Redis replay

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

@@ -121,9 +121,11 @@ export function runTests() {
 
   assert(
     dashboardSource.includes("cityListItemsToScanRows") &&
+      dashboardSource.includes("STATIC_CITY_LIST") &&
+      dashboardSource.includes("useState<ScanOpportunityRow[]>(() =>") &&
       dashboardSource.includes("/api/cities") &&
       dashboardSource.includes("cityFallbackRows"),
-    "terminal dashboard should use /api/cities fallback rows when scan terminal rows are not ready",
+    "terminal dashboard should seed fallback rows from the static city snapshot before refreshing /api/cities",
   );
   assert(fs.existsSync(staticCitiesPath), "/api/cities route should have a static city snapshot fallback");
   assert(

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

@@ -85,6 +85,17 @@ export async function runTests() {
       chartSource.includes("setHourly(seedHourlyForecastFromRow(row))"),
     "terminal charts should render from row data immediately and dedupe concurrent city detail requests",
   );
+  assert(
+    chartLogicSource.includes("/api/cities/detail-batch") &&
+      chartLogicSource.includes("flushCityDetailBatch") &&
+      chartLogicSource.includes("primeCityDetailCache"),
+    "visible terminal chart detail fetches should be coalesced into one batch request and prime the shared chart cache",
+  );
+  assert(
+    chartLogicSource.includes("options.ignoreCache\n      ? runQueuedHourlyDetailRequest") &&
+      chartLogicSource.includes(": queueCityDetailBatch(city, resParam)"),
+    "normal first-paint city detail requests should enter the batch queue before single-request concurrency limiting",
+  );
   assert(
     chartSource.includes("IntersectionObserver") &&
       chartSource.includes("shouldFetchCityDetailForChart") &&