Refine history modal loading state and MGM chart gating

frontend/components/dashboard/Dashboard.module.css

@@ -2237,6 +2237,46 @@
   height: 100% !important;
 }
 
+.root :global(.history-modal .history-modal-loading) {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 420px;
+}
+
+.root :global(.history-modal .history-loading-card) {
+  min-width: min(100%, 420px);
+  padding: 22px 26px;
+  gap: 16px;
+  border-radius: 22px;
+}
+
+.root :global(.history-modal .history-loading-card .loading-clouds),
+.root :global(.history-modal .history-loading-card .loading-windfield) {
+  width: 180px;
+}
+
+.root :global(.history-modal .history-loading-radar) {
+  width: 86px;
+  height: 86px;
+}
+
+.root :global(.history-modal .history-loading-thermals) {
+  height: 22px;
+  gap: 6px;
+}
+
+.root :global(.history-modal .history-loading-copy strong) {
+  font-size: 12px;
+  letter-spacing: 0.18em;
+}
+
+.root :global(.history-modal .history-loading-copy span) {
+  max-width: 300px;
+  font-size: 12px;
+  line-height: 1.5;
+}
+
 .root :global(.history-modal .history-peak-reference) {
   margin-top: 18px;
   padding: 14px 16px;
@@ -2315,6 +2355,10 @@
     height: 360px;
   }
 
+  .root :global(.history-modal .history-modal-loading) {
+    min-height: 340px;
+  }
+
   .root :global(.history-modal .history-peak-reference-scroll) {
     max-height: 320px;
   }
@@ -2360,6 +2404,26 @@
     padding: 8px 10px 6px;
   }
 
+  .root :global(.history-modal .history-modal-loading) {
+    min-height: 280px;
+  }
+
+  .root :global(.history-modal .history-loading-card) {
+    width: 100%;
+    min-width: 0;
+    padding: 18px 16px;
+  }
+
+  .root :global(.history-modal .history-loading-card .loading-clouds),
+  .root :global(.history-modal .history-loading-card .loading-windfield) {
+    width: 150px;
+  }
+
+  .root :global(.history-modal .history-loading-radar) {
+    width: 72px;
+    height: 72px;
+  }
+
   .root :global(.history-modal .history-peak-reference) {
     padding: 12px;
   }

frontend/components/dashboard/HistoryModal.tsx

@@ -28,6 +28,7 @@ function HistoryChart() {
   );
   const hasMgm =
     store.selectedCity === "ankara" &&
+    summary.mgmSeriesComplete &&
     summary.mgms.some((value) => value != null);
   const hasBestBaseline =
     Boolean(summary.bestModelName) &&
@@ -260,20 +261,58 @@ export function HistoryModal() {
                   : `${store.selectedDetail?.display_name || store.selectedCity || "该城市"}历史对账已按 NOAA ${noaaStationCode}（${noaaStationName}）结算口径对齐：采用该日最终完成质控后的最高整度摄氏值。`}
               </div>
             )}
-            <div className="history-stats">
+            {isLoading ? (
-              {isLoading ? (
+              <div className="history-modal-loading">
-                <span style={{ color: "var(--text-muted)" }}>
+                <div className="loading-card history-loading-card">
-                  {t("history.loading")}
+                  <div className="loading-clouds" aria-hidden="true">
-                </span>
+                    <span className="loading-cloud loading-cloud-1" />
-              ) : error ? (
+                    <span className="loading-cloud loading-cloud-2" />
+                  </div>
+                  <div className="loading-windfield" aria-hidden="true">
+                    <span className="loading-windline loading-windline-1" />
+                    <span className="loading-windline loading-windline-2" />
+                    <span className="loading-windline loading-windline-3" />
+                  </div>
+                  <div className="loading-radar history-loading-radar" aria-hidden="true">
+                    <div className="loading-radar-core" />
+                    <div className="loading-radar-ring loading-radar-ring-1" />
+                    <div className="loading-radar-ring loading-radar-ring-2" />
+                    <div className="loading-radar-sweep" />
+                    <div className="loading-radar-blip loading-radar-blip-1" />
+                    <div className="loading-radar-blip loading-radar-blip-2" />
+                  </div>
+                  <div className="loading-thermals history-loading-thermals" aria-hidden="true">
+                    <span className="loading-thermal loading-thermal-1" />
+                    <span className="loading-thermal loading-thermal-2" />
+                    <span className="loading-thermal loading-thermal-3" />
+                    <span className="loading-thermal loading-thermal-4" />
+                  </div>
+                  <div className="loading-copy history-loading-copy">
+                    <strong>
+                      {locale === "en-US"
+                        ? "Scanning archived settlement history"
+                        : "正在扫描历史结算档案"}
+                    </strong>
+                    <span>
+                      {locale === "en-US"
+                        ? "Reconciling settled highs, DEB traces, and baseline forecasts..."
+                        : "正在对齐实测高温、DEB 轨迹与基线预报..."}
+                    </span>
+                  </div>
+                </div>
+              </div>
+            ) : (
+              <>
+                <div className="history-stats">
+                  {error ? (
                 <span style={{ color: "var(--accent-red)" }}>
                   {t("history.error")}
                 </span>
-              ) : !summary.recentData.length ? (
+                  ) : !summary.recentData.length ? (
                 <span style={{ color: "var(--text-muted)" }}>
                   {t("history.empty")}
                 </span>
-              ) : (
+                  ) : (
                 <>
                   <div className="h-stat-card">
                     <span className="label">{t("history.debHitRate")}</span>
@@ -314,10 +353,10 @@ export function HistoryModal() {
                     </span>
                   </div>
                 </>
-              )}
+                  )}
-            </div>
+                </div>
-            {!isLoading && !error && <HistoryChart />}
+                {!error && <HistoryChart />}
-            {!isLoading && !error && settledPeakRows.length > 0 && (
+                {!error && settledPeakRows.length > 0 && (
               <div className="history-peak-reference">
                 <div className="history-peak-reference-title">
                   {locale === "en-US"
@@ -374,6 +413,8 @@ export function HistoryModal() {
                   ))}
                 </div>
               </div>
+                )}
+              </>
             )}
           </div>
         </div>

frontend/lib/dashboard-utils.ts

@@ -2247,6 +2247,12 @@ export function getHistorySummary(
     });
   }
 
+  const mgmSettledCount = settledData.reduce((count, row) => {
+    return toFinite(row.mgm) != null ? count + 1 : count;
+  }, 0);
+  const mgmSeriesComplete =
+    settledData.length >= 2 && mgmSettledCount === settledData.length;
+
   return {
     dates: recentData.map((row) => row.date),
     debMae: debErrors.length
@@ -2274,6 +2280,7 @@ export function getHistorySummary(
     hitRate: debErrors.length
       ? Number(((hits / debErrors.length) * 100).toFixed(0))
       : null,
+    mgmSeriesComplete,
     mgms: recentData.map((row) => row.mgm ?? null),
     recentData,
     settledCount: comparableSettledData.length,