改进METAR当日状态判断与展示

frontend/components/dashboard/PanelSections.tsx

@@ -366,6 +366,14 @@ export function HeroSummary() {
     current.max_so_far != null &&
     current.temp != null &&
     current.max_so_far <= current.temp;
+  const currentObsText =
+    current.temp != null
+      ? `${current.temp}${data.temp_symbol} @${current.obs_time || "--"}`
+      : data.metar_status?.stale_for_today
+        ? locale === "en-US"
+          ? "No same-day METAR"
+          : "今日暂无 METAR"
+        : "--";
 
   return (
     <section className="hero-section">
@@ -393,9 +401,7 @@ export function HeroSummary() {
             {locale === "en-US" ? "Current Obs" : "当前实测"}
           </span>
           <span className="value">
-            {current.temp != null
-              ? `${current.temp}${data.temp_symbol} @${current.obs_time || "--"}`
-              : "--"}
+            {currentObsText}
           </span>
         </div>
         <div className="hero-item">

frontend/lib/dashboard-types.ts

@@ -64,6 +64,7 @@ export interface CurrentConditions {
   station_name?: string | null;
   obs_time: string | null;
   obs_age_min: number | null;
+  observation_status?: "live" | "missing" | "stale" | string | null;
   wind_speed_kt: number | null;
   wind_dir: number | null;
   humidity: number | null;
@@ -100,6 +101,9 @@ export interface AirportCurrentConditions {
   is_airport_station?: boolean;
   is_official?: boolean;
   is_settlement_anchor?: boolean;
+  stale_for_today?: boolean;
+  last_observation_local_date?: string | null;
+  current_local_date?: string | null;
 }
 
 export interface NearbyStation {
@@ -466,6 +470,14 @@ export interface CityDetail {
     time?: string;
     temp?: number | null;
   }>;
+  metar_status?: {
+    available_for_today?: boolean;
+    stale_for_today?: boolean;
+    last_observation_time?: string | null;
+    last_observation_local_date?: string | null;
+    current_local_date?: string | null;
+    last_temp?: number | null;
+  };
   settlement_today_obs?: Array<{
     time?: string;
     temp?: number | null;

frontend/lib/dashboard-utils.ts

@@ -1060,6 +1060,18 @@ export function getTemperatureChartData(
         : `${metarFallbackTag}: ${airportRecentText}`,
     );
   }
+  if (detail.metar_status?.stale_for_today) {
+    const dateText = detail.metar_status.last_observation_local_date || "";
+    const tempText =
+      detail.metar_status.last_temp != null
+        ? `${detail.metar_status.last_temp}${detail.temp_symbol}`
+        : "";
+    legendParts.push(
+      isEnglish(locale)
+        ? `No same-day ${metarFallbackTag} report yet; latest report${dateText ? ` was ${dateText}` : ""}${tempText ? ` at ${tempText}` : ""}.`
+        : `今日暂无同日 ${metarFallbackTag} 报文；最近一报${dateText ? `为 ${dateText}` : ""}${tempText ? `，${tempText}` : ""}。`,
+    );
+  }
   if (shouldUseMetarFallback) {
     legendParts.push(
       isEnglish(locale)