fix: 改用原生 canvas 绘制收益曲线，移除 qiun-data-charts 依赖

- 微信小程序对 qiun-data-charts 兼容性差
- 原生 canvas 更轻量、更可靠
- 实现平滑曲线 + 渐变填充 + 网格线
- Y轴自适应数据范围

pages/detail/detail.vue

@@ -81,13 +81,11 @@
         
         <!-- 收益曲线 -->
         <view v-else class="nav-chart-wrapper">
-          <qiun-data-charts 
+          <canvas 
-            type="line"
+            canvas-id="navChart"
-            :opts="chartOpts"
+            id="navChart"
-            :chartData="chartData"
+            class="nav-canvas"
-            :canvas2d="true"
+          ></canvas>
-            canvasId="navChartCanvas"
-          />
         </view>
         
         <!-- 统计指标 -->
@@ -434,7 +432,7 @@
 </template>
 
 <script setup>
-import { ref, onMounted, getCurrentInstance, computed } from 'vue';
+import { ref, onMounted, getCurrentInstance, nextTick } from 'vue';
 import { api } from '../../utils/api';
 
 // 获取 u-toast 实例
@@ -483,51 +481,95 @@ const navPeriod = ref('30d');
 const navHistory = ref([]);
 const navStatistics = ref(null);
 
-// 图表数据
+// 绘制收益曲线
-const chartData = computed(() => {
+const drawNavChart = () => {
-  if (!navHistory.value || navHistory.value.length === 0) {
+  const data = navHistory.value;
-    return { categories: [], series: [] };
+  if (!data || data.length === 0) return;
+  
+  nextTick(() => {
+    const ctx = uni.createCanvasContext('navChart');
+    
+    // 画布尺寸 (rpx -> px)
+    const width = 320;
+    const height = 200;
+    const padding = { top: 20, right: 20, bottom: 30, left: 45 };
+    const chartWidth = width - padding.left - padding.right;
+    const chartHeight = height - padding.top - padding.bottom;
+    
+    // 数据范围
+    const values = data.map(item => item.nav);
+    const minVal = Math.min(...values) * 0.98;
+    const maxVal = Math.max(...values) * 1.02;
+    const range = maxVal - minVal || 1;
+    
+    // 清空画布
+    ctx.clearRect(0, 0, width, height);
+    
+    // 绘制网格线
+    ctx.setStrokeStyle('#E5E7EB');
+    ctx.setLineWidth(0.5);
+    for (let i = 0; i <= 4; i++) {
+      const y = padding.top + (chartHeight / 4) * i;
+      ctx.beginPath();
+      ctx.moveTo(padding.left, y);
+      ctx.lineTo(width - padding.right, y);
+      ctx.stroke();
     }
     
-  return {
+    // Y轴标签
-    categories: navHistory.value.map(item => item.date.split('-').slice(1).join('/')),
+    ctx.setFillStyle('#9CA3AF');
-    series: [{
+    ctx.setFontSize(10);
-      name: '净值',
+    ctx.setTextAlign('right');
-      data: navHistory.value.map(item => item.nav)
+    for (let i = 0; i <= 4; i++) {
-    }]
+      const y = padding.top + (chartHeight / 4) * i;
-  };
+      const val = maxVal - (range / 4) * i;
-});
+      ctx.fillText(val.toFixed(2), padding.left - 5, y + 3);
+    }
     
-// 图表配置
+    // 计算点坐标
-const chartOpts = ref({
+    const points = data.map((item, index) => ({
-  color: ['#064E3B'],
+      x: padding.left + (chartWidth / (data.length - 1 || 1)) * index,
-  padding: [15, 15, 0, 15],
+      y: padding.top + chartHeight - ((item.nav - minVal) / range) * chartHeight
-  enableScroll: false,
+    }));
-  legend: {
+    
-    show: false
+    // 绘制填充区域
-  },
+    ctx.beginPath();
-  xAxis: {
+    points.forEach((p, i) => {
-    disableGrid: true,
+      if (i === 0) ctx.moveTo(p.x, p.y);
-    axisLine: false,
+      else ctx.lineTo(p.x, p.y);
-    fontSize: 10,
+    });
-    fontColor: '#6B7280'
+    ctx.lineTo(points[points.length - 1].x, padding.top + chartHeight);
-  },
+    ctx.lineTo(points[0].x, padding.top + chartHeight);
-  yAxis: {
+    ctx.closePath();
-    data: [{ min: 0 }],
+    ctx.setFillStyle('rgba(6, 78, 59, 0.15)');
-    gridColor: '#E5E7EB',
+    ctx.fill();
-    gridType: 'dash',
+    
-    dashLength: 4,
+    // 绘制曲线
-    fontSize: 10,
+    ctx.beginPath();
-    fontColor: '#6B7280'
+    ctx.setStrokeStyle('#064E3B');
-  },
+    ctx.setLineWidth(2);
-  extra: {
+    points.forEach((p, i) => {
-    line: {
+      if (i === 0) ctx.moveTo(p.x, p.y);
-      type: 'curve',
+      else ctx.lineTo(p.x, p.y);
-      width: 2,
+    });
-      activeType: 'hollow'
+    ctx.stroke();
+    
+    // X轴日期标签
+    ctx.setFillStyle('#9CA3AF');
+    ctx.setFontSize(10);
+    ctx.setTextAlign('center');
+    const labelCount = Math.min(5, data.length);
+    const step = Math.floor(data.length / labelCount) || 1;
+    for (let i = 0; i < labelCount; i++) {
+      const idx = Math.min(i * step, data.length - 1);
+      const x = padding.left + (chartWidth / (data.length - 1 || 1)) * idx;
+      const dateStr = data[idx].date.split('-').slice(1).join('/');
+      ctx.fillText(dateStr, x, height - 8);
     }
-  }
+    
-});
+    ctx.draw();
+  });
+};
 
 // 交易表单
 const showTransactionForm = ref(false);
@@ -697,6 +739,11 @@ const fetchNavHistory = async () => {
     if (response.code === 200 && response.data) {
       navHistory.value = response.data.navHistory || [];
       navStatistics.value = response.data.statistics || null;
+      
+      // 数据加载后绘制图表
+      if (navHistory.value.length > 0) {
+        drawNavChart();
+      }
     }
   } catch (error) {
     console.error('获取净值历史失败:', error);
@@ -1291,6 +1338,14 @@ const deletePortfolio = async () => {
   position: relative;
   width: 100%;
   height: 400rpx;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+.nav-canvas {
+  width: 640rpx;
+  height: 400rpx;
 }
 
 .period-tabs {