修复终端首屏图表加载动画

frontend/components/dashboard/ScanTerminalDashboard.tsx

@@ -499,6 +499,64 @@ function EmptySlotCard({
   );
 }
 
+function LoadingSlotCard({
+  city,
+  isActive,
+  isEn,
+  onSelectSlot,
+}: {
+  city: string;
+  isActive: boolean;
+  isEn: boolean;
+  onSelectSlot: () => void;
+}) {
+  const cityLabel = city
+    .split(/[-_\s]+/)
+    .filter(Boolean)
+    .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
+    .join(" ") || city;
+
+  return (
+    <div
+      onClick={onSelectSlot}
+      className={clsx(
+        "relative flex h-full min-h-0 flex-col overflow-hidden rounded-[4px] border bg-white cursor-default",
+        isActive ? "border-blue-500 ring-2 ring-blue-500/20 shadow-md z-10" : "border-[#d2d9e2]",
+      )}
+    >
+      <div className="flex h-9 shrink-0 items-center justify-between border-b border-slate-200 px-3">
+        <div className="flex min-w-0 items-center gap-2 text-[11px] font-bold text-slate-600">
+          <span className="h-2 w-2 animate-pulse rounded-full bg-blue-500" />
+          <span className="truncate">{cityLabel}</span>
+          <span className="text-slate-300">·</span>
+          <span className="text-slate-400">{isEn ? "Loading chart" : "加载图表"}</span>
+        </div>
+        <span className="h-3 w-3 animate-spin rounded-full border-2 border-slate-200 border-t-blue-500" />
+      </div>
+      <div className="relative min-h-0 flex-1 overflow-hidden bg-white">
+        <div className="absolute inset-x-3 bottom-7 top-5 rounded-sm border border-slate-100">
+          {Array.from({ length: 6 }).map((_, index) => (
+            <span
+              key={`h-${index}`}
+              className="absolute left-0 right-0 border-t border-dashed border-sky-100"
+              style={{ top: `${(index / 5) * 100}%` }}
+            />
+          ))}
+          {Array.from({ length: 7 }).map((_, index) => (
+            <span
+              key={`v-${index}`}
+              className="absolute bottom-0 top-0 border-l border-dashed border-sky-100"
+              style={{ left: `${(index / 6) * 100}%` }}
+            />
+          ))}
+          <div className="absolute left-8 right-8 top-1/3 h-10 animate-pulse rounded bg-gradient-to-r from-slate-100 via-blue-100 to-slate-100" />
+          <div className="absolute inset-y-0 -left-1/3 w-1/3 animate-[pulse_1.2s_ease-in-out_infinite] bg-gradient-to-r from-transparent via-white/80 to-transparent" />
+        </div>
+      </div>
+    </div>
+  );
+}
+
 const TerminalSidebar = memo(function TerminalSidebar({
   activeNavKey,
   isEn,
@@ -1186,6 +1244,19 @@ function PolyWeatherTerminal({
                               (r) => String(r.city || "").toLowerCase() === cityInSlot
                             ) || null
                           : null;
+                        const isSavedSlotLoading = Boolean(cityInSlot && !rowForSlot && refreshing);
+
+                        if (isSavedSlotLoading && cityInSlot) {
+                          return (
+                            <LoadingSlotCard
+                              key={slotIndex}
+                              city={cityInSlot}
+                              isActive={isSlotActive}
+                              isEn={isEn}
+                              onSelectSlot={() => setActiveSlotIndex(slotIndex)}
+                            />
+                          );
+                        }
 
                         if (!cityInSlot || !rowForSlot) {
                           return (

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

@@ -89,7 +89,8 @@ function TemperatureChartSkeleton({ compact }: { compact: boolean }) {
             style={{ left: `${(index / Math.max(1, verticalLines - 1)) * 100}%` }}
           />
         ))}
-        <div className="absolute inset-x-10 top-1/3 h-10 rounded bg-slate-100/60" />
+        <div className="absolute inset-x-10 top-1/3 h-10 animate-pulse rounded bg-gradient-to-r from-slate-100 via-blue-100 to-slate-100" />
+        <div className="absolute inset-y-0 -left-1/3 w-1/3 animate-pulse bg-gradient-to-r from-transparent via-white/80 to-transparent" />
       </div>
     </div>
   );

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

@@ -101,9 +101,10 @@ export function runTests() {
     "terminal guide must describe the new 3x2 maximum layout instead of 3x3",
   );
   assert(
-    dashboardSource.includes("if (!cityInSlot || !rowForSlot)") &&
+    dashboardSource.includes("LoadingSlotCard") &&
+      dashboardSource.includes("cityInSlot && !rowForSlot && refreshing") &&
       dashboardSource.includes("handleSelectCityForSlot(slotIndex, null);"),
-    "stale saved chart slots must render the empty city picker instead of a row=null Temperature Chart",
+    "terminal must show a loading chart card for saved cities while the first scan rows are still loading, then fall back to the empty picker for stale slots",
   );
   assert(
     dashboardSource.includes("absolute left-1/2 top-12 z-50") &&
@@ -223,6 +224,12 @@ export function runTests() {
     }),
     "temperature chart should show the loading skeleton while the first detail fetch is in flight and no drawable data exists",
   );
+  assert(
+    chartCanvasSource.includes("animate-pulse") &&
+      chartCanvasSource.includes("Loading chart") &&
+      chartCanvasSource.includes("bg-gradient-to-r"),
+    "temperature chart loading skeleton must include visible animation on cold first-open charts",
+  );
   assert(
     !__shouldKeepTemperatureChartLoadingForTest({
       row: { city: "Moscow" } as any,