fix: improve chart tooltip and metar refresh

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

@@ -99,6 +99,16 @@ export async function runTests() {
       chartLogicSource.includes("recentlyRefreshed.data"),
     "forced chart detail refreshes should reuse a very recent full-detail payload instead of refetching repeatedly",
   );
+  assert(
+    chartLogicSource.includes("forceRefresh: boolean") &&
+      chartLogicSource.includes('force_refresh: forceRefresh ? "true" : "false"'),
+    "ignoreCache chart detail refreshes must send force_refresh=true so fresh METAR observations bypass proxy and backend chart caches",
+  );
+  assert(
+    chartLogicSource.includes("cityDetailBatchQueueKey") &&
+      chartLogicSource.includes('forceRefresh ? "force" : "cached"'),
+    "forced and cached chart detail requests must use separate batch queues so a normal first-paint request cannot downgrade a live refresh",
+  );
   assert(
     __shouldPollLiveChartForTest({ city: "shanghai", compact: true, isActive: false, isMaximized: false }) === true,
     "compact grid slots are visible charts and should run the no-patch fallback guard",
@@ -148,7 +158,7 @@ export async function runTests() {
   );
   const fetchHourlyBlock = chartLogicSource.match(/async function fetchHourlyForecastForCity[\s\S]*?\r?\n}\r?\n\r?\nfunction shouldPollLiveChart/)?.[0] || "";
   assert(
-    fetchHourlyBlock.includes("queueCityDetailBatch(city, resParam)") &&
+    fetchHourlyBlock.includes("queueCityDetailBatch(city, resParam, forceRefresh)") &&
       !fetchHourlyBlock.includes("runQueuedHourlyDetailRequest"),
     "first-paint and background city detail refreshes should both enter the batch queue without falling back to single requests",
   );

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

@@ -1,4 +1,7 @@
-import { __buildTemperatureTooltipRowsForTest } from "@/components/dashboard/scan-terminal/TemperatureTooltipContent";
+import {
+  __buildTemperatureTooltipProbabilityRowsForTest,
+  __buildTemperatureTooltipRowsForTest,
+} from "@/components/dashboard/scan-terminal/TemperatureTooltipContent";
 
 function assert(condition: unknown, message: string) {
   if (!condition) throw new Error(message);
@@ -48,4 +51,33 @@ export function runTests() {
     rows.some((row) => row.key === "gfs" && row.value === 24.2),
     "non-runway sparse series should keep nearest-value fallback",
   );
+
+  const probabilityRows = __buildTemperatureTooltipProbabilityRowsForTest(
+    {
+      engine: "legacy",
+      muLine: { value: 27.4, label: "Gaussian μ 27.4°C" },
+      bands: [
+        {
+          key: "legacy_probability_27_0",
+          value: 27,
+          lower: 26.5,
+          upper: 27.5,
+          probability: 0.42,
+          label: "27°C 42%",
+          opacity: 0.13,
+        },
+      ],
+    },
+    "°C",
+    true,
+  );
+
+  assert(
+    probabilityRows.some((row) => row.key === "gaussian_mu" && row.value === "27.4°C"),
+    "tooltip should expose the Gaussian μ line when the purple probability overlay is present",
+  );
+  assert(
+    probabilityRows.some((row) => row.value.includes("26.5-27.5°C") && row.value.includes("42%")),
+    "tooltip should expose purple probability-band range and probability values",
+  );
 }