feat: 优化首页性能

app/components/RefreshButton.jsx

@@ -0,0 +1,40 @@
+'use client';
+
+import { useEffect, useState } from "react";
+import { RefreshIcon } from './Icons';
+
+export default function RefreshButton({ refreshCycleStartRef, refreshMs, manualRefresh, refreshing, fundsLength }) {
+
+  // 刷新周期进度 0~1，用于环形进度条
+  const [refreshProgress, setRefreshProgress] = useState(0);
+
+  // 刷新进度条：每 100ms 更新一次进度
+  useEffect(() => {
+    if (fundsLength === 0 || refreshMs <= 0) return;
+    const t = setInterval(() => {
+      const elapsed = Date.now() - refreshCycleStartRef.current;
+      const p = Math.min(1, elapsed / refreshMs);
+      setRefreshProgress(p);
+    }, 100);
+    return () => clearInterval(t);
+  }, [fundsLength, refreshMs]);
+
+  return (
+    <div
+      className="refresh-btn-wrap"
+      style={{ '--progress': refreshProgress }}
+      title={`刷新周期 ${Math.round(refreshMs / 1000)} 秒`}
+    >
+      <button
+        className="icon-button"
+        aria-label="立即刷新"
+        onClick={manualRefresh}
+        disabled={refreshing || fundsLength === 0}
+        aria-busy={refreshing}
+        title="立即刷新"
+      >
+        <RefreshIcon className={refreshing ? 'spin' : ''} width="18" height="18" />
+      </button>
+    </div>
+  );
+}