fix: add missing FundingChart component

frontend/components/FundingChart.tsx

@@ -0,0 +1,95 @@
+"use client";
+
+import { HistoryResponse } from "@/lib/api";
+import {
+  LineChart,
+  Line,
+  XAxis,
+  YAxis,
+  Tooltip,
+  Legend,
+  ResponsiveContainer,
+  ReferenceLine,
+} from "recharts";
+
+interface Props {
+  history: HistoryResponse;
+}
+
+export default function FundingChart({ history }: Props) {
+  // 合并BTC和ETH数据，按时间对齐
+  const btcMap = new Map(
+    history.BTC.map((p) => [p.timestamp.slice(0, 13), p.fundingRate * 100])
+  );
+  const ethMap = new Map(
+    history.ETH.map((p) => [p.timestamp.slice(0, 13), p.fundingRate * 100])
+  );
+
+  const allTimes = Array.from(
+    new Set([...btcMap.keys(), ...ethMap.keys()])
+  ).sort();
+
+  const data = allTimes.map((t) => ({
+    time: t.slice(5).replace("T", " "), // "02-26 12"
+    BTC: btcMap.get(t) ?? null,
+    ETH: ethMap.get(t) ?? null,
+  }));
+
+  // 只显示最近 42 条（7天×6次/天）
+  const displayData = data.slice(-42);
+
+  const CustomTooltip = ({ active, payload, label }: any) => {
+    if (!active || !payload?.length) return null;
+    return (
+      <div className="bg-slate-800 border border-slate-600 rounded-lg p-3 text-xs">
+        <p className="text-slate-400 mb-2">{label}</p>
+        {payload.map((p: any) => (
+          <p key={p.dataKey} style={{ color: p.color }}>
+            {p.dataKey}: {p.value !== null ? `${p.value.toFixed(4)}%` : "--"}
+          </p>
+        ))}
+      </div>
+    );
+  };
+
+  return (
+    <ResponsiveContainer width="100%" height={240}>
+      <LineChart data={displayData} margin={{ top: 4, right: 8, bottom: 4, left: 8 }}>
+        <XAxis
+          dataKey="time"
+          tick={{ fill: "#64748b", fontSize: 10 }}
+          tickLine={false}
+          interval="preserveStartEnd"
+        />
+        <YAxis
+          tick={{ fill: "#64748b", fontSize: 10 }}
+          tickLine={false}
+          axisLine={false}
+          tickFormatter={(v) => `${v.toFixed(3)}%`}
+          width={60}
+        />
+        <Tooltip content={<CustomTooltip />} />
+        <Legend
+          wrapperStyle={{ fontSize: 12, color: "#94a3b8" }}
+        />
+        <ReferenceLine y={0} stroke="#475569" strokeDasharray="4 2" />
+        <Line
+          type="monotone"
+          dataKey="BTC"
+          stroke="#06b6d4"
+          strokeWidth={1.5}
+          dot={false}
+          connectNulls
+        />
+        <Line
+          type="monotone"
+          dataKey="ETH"
+          stroke="#8b5cf6"
+          strokeWidth={1.5}
+          dot={false}
+          connectNulls
+        />
+      </LineChart>
+    </ResponsiveContainer>
+  );
+}