60s 轮询扩展：跑道曲线 + 站点观测同步刷新

原来只轮询 summary 拿 current.temp 更新数字。
现在同时 fetch detail?depth=full 合并 amos/runway_plate_history/
airport_primary_today_obs 等字段，跑道曲线和站点线每 60s 刷新。
后端 CITY_FULL_CACHE_TTL_SEC=60 保证轻量命中缓存。

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

@@ -1211,10 +1211,11 @@ export function LiveTemperatureThresholdChart({
     };
   }, [city, row, isActive, slotIndex]);
 
-  // ── 60s lightweight live-temp poll ──
+  // ── 60s live poll: summary (number) + detail amos/runway (curves) ──
   useEffect(() => {
     if (!city) return;
-    const fetchLiveTemp = () => {
+    const poll = () => {
+      // Lightweight: current temp number
       fetch(`/api/city/${encodeURIComponent(city)}/summary`)
         .then((res) => (res.ok ? res.json() : null))
         .then((payload) => {
@@ -1223,9 +1224,38 @@ export function LiveTemperatureThresholdChart({
           if (temp !== null) setLiveTemp(temp);
         })
         .catch(() => {});
+
+      // Refresh runway curves and station observations
+      fetch(`/api/city/${encodeURIComponent(city)}/detail?depth=full&force_refresh=false`)
+        .then((res) => (res.ok ? res.json() : null))
+        .then((json) => {
+          if (!json) return;
+          setHourly((prev) => {
+            if (!prev) return prev;
+            return {
+              ...prev,
+              amos: json.amos ?? prev.amos,
+              airportPrimary: json.airport_primary ?? prev.airportPrimary,
+              airportCurrent: json.airport_current ?? prev.airportCurrent,
+              airportPrimaryTodayObs: (json as any)?.official?.airport_primary_today_obs
+                || json.airport_primary_today_obs
+                || prev.airportPrimaryTodayObs,
+              runwayPlateHistory: (json as any)?.runway_plate_history
+                || (json.amos as any)?.runway_plate_history
+                || prev.runwayPlateHistory,
+              settlementTodayObs: (json as any).timeseries?.settlement_today_obs
+                || (json as any)?.settlement_today_obs
+                || prev.settlementTodayObs,
+              metarTodayObs: (json as any).timeseries?.metar_today_obs
+                || (json as any)?.metar_today_obs
+                || prev.metarTodayObs,
+            };
+          });
+        })
+        .catch(() => {});
     };
-    fetchLiveTemp();
-    const id = setInterval(fetchLiveTemp, 60_000);
+    poll();
+    const id = setInterval(poll, 60_000);
     return () => clearInterval(id);
   }, [city]);
 

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

@@ -11,21 +11,60 @@ export function LoadingSignal({
 }) {
   return (
     <div
-      className={clsx("scan-loading-signal", compact && "compact")}
+      className={clsx(
+        "flex flex-col items-center justify-center text-center select-none",
+        compact ? "p-4 gap-2 w-full max-w-[280px]" : "p-6 gap-4 w-full max-w-[360px]"
+      )}
       role="status"
       aria-live="polite"
     >
-      <div className="scan-loading-spinner-wrapper" aria-hidden="true">
-        <div className="scan-loading-spinner-ring" />
-        <img
-          src="/apple-touch-icon.png"
-          alt="PolyWeather"
-          className="scan-loading-spinner-logo"
-        />
+      <div 
+        className={clsx(
+          "relative flex items-center justify-center rounded-full shrink-0",
+          compact ? "w-16 h-16" : "w-24 h-24"
+        )} 
+        aria-hidden="true"
+      >
+        {/* Background Track Ring */}
+        <div className="absolute inset-0 rounded-full border-[3px] border-slate-200/80 dark:border-slate-800" />
+        
+        {/* Active Spinning Ring */}
+        <div className="absolute inset-0 rounded-full border-[3px] border-transparent border-t-blue-500 border-r-blue-400 animate-spin" />
+        
+        {/* Centered Rounded Logo Card */}
+        <div 
+          className={clsx(
+            "absolute bg-white dark:bg-slate-900 rounded-xl flex items-center justify-center shadow-sm border border-slate-100/80 dark:border-slate-800/80",
+            compact ? "w-10 h-10" : "w-14 h-14"
+          )}
+        >
+          <img
+            src="/apple-touch-icon.png"
+            alt="PolyWeather Logo"
+            className={clsx(
+              "object-contain rounded-lg",
+              compact ? "w-7 h-7" : "w-10 h-10"
+            )}
+          />
+        </div>
       </div>
-      <div className="scan-loading-copy-block">
-        <strong>{title}</strong>
-        {description ? <span>{description}</span> : null}
+      
+      {/* Text Copy */}
+      <div className="flex flex-col items-center gap-1">
+        <strong className={clsx(
+          "font-bold text-slate-800 dark:text-slate-100",
+          compact ? "text-xs" : "text-sm"
+        )}>
+          {title}
+        </strong>
+        {description && (
+          <span className={clsx(
+            "text-slate-500 dark:text-slate-400 leading-normal",
+            compact ? "text-[10px] max-w-[200px]" : "text-xs max-w-[280px]"
+          )}>
+            {description}
+          </span>
+        )}
       </div>
     </div>
   );

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

@@ -38,8 +38,8 @@ export function runTests() {
     "selected city detail chart cache should align with 5-minute scan/metar cadence",
   );
   assert(
-    chartSource.includes("setInterval(fetchLiveTemp, 60_000)"),
-    "selected city chart should poll live temperature every 60 seconds via lightweight summary endpoint",
+    chartSource.includes("setInterval(poll, 60_000)"),
+    "selected city chart should poll live temperature and runway curves every 60 seconds",
   );
   assert(
     chartSource.includes("_hourlyRequestCache") &&