feat: 定投

app/components/FundTrendChart.jsx

@@ -311,7 +311,15 @@ export default function FundTrendChart({ code, isExpanded, onToggleExpand, trans
           const textW = ctx.measureText(text).width;
           const w = textW + paddingH * 2;
           const h = 18;
-          const left = x - w / 2;
+
+          // 计算原始 left，并对左右边界做收缩，避免在最右/最左侧被裁剪
+          const chartLeft = chart.scales.x.left;
+          const chartRight = chart.scales.x.right;
+          let left = x - w / 2;
+          if (left < chartLeft) left = chartLeft;
+          if (left + w > chartRight) left = chartRight - w;
+          const centerX = left + w / 2;
+
           const top = y - 24;
 
           drawRoundRect(left, top, w, h, radius);
@@ -323,7 +331,7 @@ export default function FundTrendChart({ code, isExpanded, onToggleExpand, trans
           ctx.fillStyle = textColor;
           ctx.textAlign = 'center';
           ctx.textBaseline = 'middle';
-          ctx.fillText(text, x, top + h / 2);
+          ctx.fillText(text, centerX, top + h / 2);
           ctx.restore();
       };