Throttle chart stale retry badges

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

@@ -69,8 +69,9 @@ export async function runTests() {
   assert(
     chartSource.includes("useLatestPatch") &&
       chartSource.includes("latestPatch") &&
-      chartSource.includes("2 * 60_000"),
-    "selected city chart should consume SSE patches and use a 2-minute no-patch fallback",
+      chartSource.includes("DASHBOARD_REFRESH_POLICY_MS.metar") &&
+      !chartSource.includes("2 * 60_000"),
+    "selected city chart should consume SSE patches and use a METAR-cadence no-patch fallback instead of a 2-minute forced refresh",
   );
   assert(
     chartSource.includes("preloadTemperatureChartCanvas"),
@@ -184,6 +185,12 @@ export async function runTests() {
       chartCanvasSourceIncludes(chartSource, "handleRetryDetail"),
     "city detail charts should show stale cache first and expose a retryable unavailable state",
   );
+  assert(
+    chartSource.includes("const showDetailErrorBadge = !compact || isActive || isMaximized") &&
+      chartSource.includes("showDetailErrorBadge={showDetailErrorBadge}") &&
+      chartCanvasSourceIncludes(chartSource, "showDetailErrorBadge"),
+    "compact grid charts should only show the stale-cache retry badge on the active slot or expanded chart",
+  );
   assert(
     __shouldFetchCityDetailForChartForTest({ city: "paris", documentHidden: false, isChartVisible: true }) === true,
     "visible chart cards should fetch city detail",