Load terminal chart canvas eagerly

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

@@ -1,13 +1,12 @@
 "use client";
 
 import clsx from "clsx";
-import dynamic from "next/dynamic";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import type { ScanOpportunityRow } from "@/lib/dashboard-types";
 import { useLatestPatch, useSseResyncVersion } from "@/hooks/use-sse-patches";
 import { Panel } from "@/components/dashboard/scan-terminal/Panel";
 import { ModelCurvesSummary } from "@/components/dashboard/scan-terminal/ModelCurvesSummary";
-import { TemperatureChartCanvasFallback } from "@/components/dashboard/scan-terminal/TemperatureChartCanvasFallback";
+import { TemperatureChartCanvas } from "@/components/dashboard/scan-terminal/TemperatureChartCanvas";
 import { TemperatureRunwayDetails } from "@/components/dashboard/scan-terminal/TemperatureRunwayDetails";
 import { TemperatureStatsBars } from "@/components/dashboard/scan-terminal/TemperatureStatsBars";
 import { rowName } from "@/components/dashboard/scan-terminal/utils";
@@ -63,32 +62,10 @@ const DEFERRED_DETAIL_LOAD_DELAY_MS = 1_200;
 const DEFERRED_DETAIL_LOAD_GROUP_SIZE = 3;
 const DEFERRED_DETAIL_LOAD_WAVE_STEP_MS = 900;
 
-let temperatureChartCanvasModulePromise: Promise<
-  typeof import("@/components/dashboard/scan-terminal/TemperatureChartCanvas")
-> | null = null;
-
-function loadTemperatureChartCanvasModule() {
-  temperatureChartCanvasModulePromise ??= import(
-    "@/components/dashboard/scan-terminal/TemperatureChartCanvas"
-  );
-  return temperatureChartCanvasModulePromise;
-}
-
 export function preloadTemperatureChartCanvas() {
-  return loadTemperatureChartCanvasModule().then(() => undefined, () => undefined);
+  return Promise.resolve();
 }
 
-const TemperatureChartCanvas = dynamic(
-  () =>
-    loadTemperatureChartCanvasModule().then(
-      (mod) => mod.TemperatureChartCanvas,
-    ),
-  {
-    ssr: false,
-    loading: () => <TemperatureChartCanvasFallback />,
-  },
-);
-
 function peakGlowLabel(state: keyof typeof PEAK_GLOW_PANEL_CLASS, isEn: boolean) {
   if (state === "watch") return isEn ? "Watch" : "关注";
   if (state === "near_peak") return isEn ? "Near peak" : "接近峰值";

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

@@ -1,35 +0,0 @@
-export function TemperatureChartCanvasFallback({ compact }: { compact?: boolean }) {
-  const horizontalLines = compact ? 5 : 7;
-  const verticalLines = compact ? 5 : 8;
-  const minChartHeight = compact === false ? 220 : 120;
-
-  return (
-    <div
-      className="relative flex-1 overflow-hidden rounded-sm border border-slate-100 bg-white"
-      style={{ minHeight: minChartHeight }}
-    >
-      <div className="absolute inset-x-3 bottom-7 top-4 rounded-sm border border-slate-100">
-        {Array.from({ length: horizontalLines }).map((_, index) => (
-          <span
-            key={`h-${index}`}
-            className="absolute left-0 right-0 border-t border-dashed border-sky-100"
-            style={{ top: `${(index / Math.max(1, horizontalLines - 1)) * 100}%` }}
-          />
-        ))}
-        {Array.from({ length: verticalLines }).map((_, index) => (
-          <span
-            key={`v-${index}`}
-            className="absolute bottom-0 top-0 border-l border-dashed border-sky-100"
-            style={{ left: `${(index / Math.max(1, verticalLines - 1)) * 100}%` }}
-          />
-        ))}
-      </div>
-      <div className="absolute inset-0 grid place-items-center">
-        <div className="flex items-center gap-2 rounded border border-slate-200 bg-white px-3 py-2 text-xs font-semibold text-slate-500 shadow-sm">
-          <span className="h-3 w-3 animate-spin rounded-full border-2 border-blue-200 border-t-blue-500" />
-          加载图表
-        </div>
-      </div>
-    </div>
-  );
-}

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

@@ -73,9 +73,14 @@ export async function runTests() {
     "selected city chart should consume SSE patches and use a 2-minute no-patch fallback",
   );
   assert(
-    chartSource.includes("loadTemperatureChartCanvasModule") &&
-      chartSource.includes("preloadTemperatureChartCanvas"),
-    "terminal chart canvas should expose a preload hook for the dynamic chart chunk",
+    chartSource.includes("preloadTemperatureChartCanvas"),
+    "terminal chart canvas should expose a preload hook for first-paint optimization",
+  );
+  assert(
+    chartSource.includes('from "@/components/dashboard/scan-terminal/TemperatureChartCanvas"') &&
+      !chartSource.includes("next/dynamic") &&
+      !chartSource.includes("TemperatureChartCanvasFallback"),
+    "terminal chart canvas should be loaded with the terminal route instead of showing a second-stage dynamic chunk fallback",
   );
   assert(
     dashboardSource.includes("preloadTemperatureChartCanvas") &&

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

@@ -97,11 +97,10 @@ export function runTests() {
     "terminal dashboard must lazy-load the training analytics tab so Recharts stays out of the default terminal path",
   );
   assert(
-    chartSource.includes('from "next/dynamic"') &&
-      chartSource.includes("TemperatureChartCanvasFallback") &&
-      chartSource.includes("import(\"@/components/dashboard/scan-terminal/TemperatureChartCanvas\")") &&
-      !chartSource.includes('import { TemperatureChartCanvas } from "@/components/dashboard/scan-terminal/TemperatureChartCanvas";'),
-    "terminal temperature charts must lazy-load the Recharts canvas behind a lightweight fallback",
+    chartSource.includes('import { TemperatureChartCanvas } from "@/components/dashboard/scan-terminal/TemperatureChartCanvas";') &&
+      !chartSource.includes("TemperatureChartCanvasFallback") &&
+      !chartSource.includes("import(\"@/components/dashboard/scan-terminal/TemperatureChartCanvas\")"),
+    "terminal temperature charts must load the Recharts canvas with the terminal route so visible cards do not sit behind a second-stage fallback",
   );
   assert(
     chartSource.includes("setLiveTemp(null);") &&