feat: add live temperature threshold chart logic and components for runway monitoring

frontend/components/dashboard/scan-terminal/LiveTemperatureThresholdChart.tsx

@@ -444,7 +444,17 @@ export function LiveTemperatureThresholdChart({
   }, [row, chartHourly, tzOffset, chartLocalDate]);
 
   const runwayPlates = useMemo(() => buildRunwayPlates(chartHourly?.amos, row, settlementObs), [chartHourly?.amos, row, settlementObs]);
-  const hasRunwayData = runwayPlates.length > 0;
+  const hasRunwaySeries = useMemo(
+    () =>
+      series.some(
+        (item) =>
+          item.key.startsWith("runway_") &&
+          item.key !== "runway_max" &&
+          item.values.some((value) => validNumber(value) !== null),
+      ),
+    [series],
+  );
+  const hasRunwayData = runwayPlates.length > 0 || hasRunwaySeries;
   const settlementPlate = useMemo(() => runwayPlates.find((p) => p.isSettlement), [runwayPlates]);
 
   const chartSeries = useMemo(() => {

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

@@ -10,6 +10,7 @@ import {
   __mergePatchIntoHourlyForTest,
   __selectDisplayRunwayTempForTest,
 } from "@/components/dashboard/scan-terminal/LiveTemperatureThresholdChart";
+import { __buildTemperatureTooltipRowsForTest } from "@/components/dashboard/scan-terminal/TemperatureTooltipContent";
 
 function assert(condition: unknown, message: string): asserts condition {
   if (!condition) throw new Error(message);
@@ -369,6 +370,23 @@ export function runTests() {
       !englishSettlement?.label.includes("结算跑道"),
       `${city} English settlement runway label should not leak Chinese`,
     );
+    const englishRunwayPoint = englishChart.data.find(
+      (point: any) => point[runwayKey(settlementRwy)] !== null && point[runwayKey(settlementRwy)] !== undefined,
+    );
+    const tooltipRows = __buildTemperatureTooltipRowsForTest(
+      englishRunwayPoint as any,
+      englishChart.data,
+      englishChart.series,
+    );
+    const tooltipRunway = tooltipRows.find((item) => item.key === runwayKey(settlementRwy));
+    assert(
+      tooltipRunway?.label.includes("Settlement Runway"),
+      `${city} English tooltip runway label should be translated`,
+    );
+    assert(
+      !tooltipRunway?.label.includes("结算跑道"),
+      `${city} English tooltip runway label should not leak Chinese`,
+    );
   });
 
   const shenzhen = __buildTemperatureChartDataForTest(
@@ -785,6 +803,36 @@ export function runTests() {
     "live aggregate temp should not override runway-history current temp when runway data is rendered",
   );
 
+  const wuhanRunwayMetrics = __getObservationDisplayMetricsForTest(
+    {
+      city: "wuhan",
+      local_date: "2026-05-27",
+      local_time: "13:54",
+      tz_offset_seconds: 8 * 60 * 60,
+      current_temp: 25.0,
+      temp_symbol: "°C",
+    } as any,
+    {
+      localTime: "13:54",
+      times: ["00:00", "12:00", "18:00", "23:00"],
+      temps: [22.0, 30.0, 29.0, 25.0],
+      runwayPlateHistory: {
+        "04/22": [
+          { time: "13:52", temp: 28.6 },
+          { time: "13:54", temp: 28.8 },
+        ],
+      },
+    } as any,
+  );
+  assert(
+    wuhanRunwayMetrics.currentRunwayTemp === 28.8,
+    "runway header metrics should use the latest settlement runway history point",
+  );
+  assert(
+    __selectDisplayRunwayTempForTest(25.0, wuhanRunwayMetrics.currentRunwayTemp, false) === 28.8,
+    "runway header should prefer runway-history current temp even when the latest detail payload lacks runway_obs snapshot",
+  );
+
   const newYorkMetrics = __getObservationDisplayMetricsForTest(
     {
       city: "new york",

frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts

@@ -713,12 +713,10 @@ function getObservationDisplayMetrics(
 function selectDisplayRunwayTemp(
   liveTemp: number | null,
   currentRunwayTemp: number | null,
-  hasRunwayData: boolean,
+  _hasRunwayData: boolean,
 ) {
-  if (hasRunwayData && currentRunwayTemp !== null) {
+  if (currentRunwayTemp !== null) return currentRunwayTemp;
-    return currentRunwayTemp;
+  return liveTemp;
-  }
-  return liveTemp ?? currentRunwayTemp;
 }
 
 function isSettlementRunway(row: ScanOpportunityRow | null, rwy: string) {