fix: keep terminal charts visible during scan refresh

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

@@ -702,7 +702,7 @@ export function LiveTemperatureThresholdChart({
       actions={timeframeActions}
       className={PEAK_GLOW_PANEL_CLASS[peakGlow.state]}
     >
-      <div className="flex h-full min-h-[300px] flex-col">
+      <div className={clsx("flex h-full flex-col", compact ? "min-h-0" : "min-h-[300px]")}>
         <TemperatureStatsBars
           isEn={isEn}
           compact={compact}

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

@@ -115,7 +115,8 @@ export function TemperatureChartCanvas({
 
   const canRenderChart = chartSize.width > 0 && chartSize.height > 0;
   const chartWidth = Math.max(1, chartSize.width);
-  const chartHeight = Math.max(220, chartSize.height);
+  const minChartHeight = compact ? 120 : 220;
+  const chartHeight = Math.max(minChartHeight, chartSize.height);
   const individualRunwaySeriesCount = chartSeries.filter(
     (series) => series.key.startsWith("runway_") && series.key !== "runway_max",
   ).length;
@@ -125,7 +126,7 @@ export function TemperatureChartCanvas({
     chartSeries.some((series) => series.key === "runway_max");
 
   return (
-    <div className="relative flex min-h-[240px] flex-1 flex-col p-2">
+    <div className={clsx("relative flex flex-1 flex-col p-2", compact ? "min-h-[120px]" : "min-h-[240px]")}>
       <div className="flex flex-wrap items-center gap-x-4 gap-y-1.5 px-3 py-1.5 text-[11px] border-b border-[#e2e8f0] bg-white">
         {chartSeries.length > 1 &&
           chartSeries
@@ -187,7 +188,7 @@ export function TemperatureChartCanvas({
           </span>
         )}
       </div>
-      <div ref={chartHostRef} className="relative min-h-[220px] flex-1">
+      <div ref={chartHostRef} className={clsx("relative flex-1", compact ? "min-h-[120px]" : "min-h-[220px]")}>
         {canRenderChart && (
           <ReComposedChart
             width={chartWidth}

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

@@ -19,6 +19,10 @@ export function runTests() {
     path.join(projectRoot, "components", "dashboard", "scan-terminal", "LiveTemperatureThresholdChart.tsx"),
     "utf8",
   );
+  const chartCanvasSource = fs.readFileSync(
+    path.join(projectRoot, "components", "dashboard", "scan-terminal", "TemperatureChartCanvas.tsx"),
+    "utf8",
+  );
 
   assert(
     dashboardSource.includes("MAX_TERMINAL_CHARTS = 9"),
@@ -55,4 +59,10 @@ export function runTests() {
       chartSource.includes("lastAppliedPatchRevisionRef.current = 0;"),
     "switching city slots must clear the previous live temperature so Fahrenheit values cannot leak into Celsius charts",
   );
+  assert(
+    chartSource.includes('compact ? "min-h-0" : "min-h-[300px]"') &&
+      chartCanvasSource.includes("const minChartHeight = compact ? 120 : 220") &&
+      chartCanvasSource.includes('compact ? "min-h-[120px]" : "min-h-[220px]"'),
+    "compact grid charts must not force desktop minimum heights that get clipped inside 3x3 terminal slots",
+  );
 }