fix: 客户饼图按城市显示时按省份(区域)分组排序

同省城市相邻显示：华东(嘉兴/宁波/金华)→华南(佛山/广州)→华中(开封)→...
组内按数量降序。

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/App.tsx

@@ -512,17 +512,28 @@ export default function App() {
       customerData.forEach(item => { map[item.region] = (map[item.region] || 0) + item.total; });
       data = Object.entries(map).map(([name, value]) => ({ name, value })).sort((a, b) => b.value - a.value);
     } else {
-      const map: Record<string, number> = {};
-      customerData.forEach(item => { map[item.city] = (map[item.city] || 0) + item.total; });
-      const tot = Object.values(map).reduce((a, b) => a + b, 0);
+      const cityMap: Record<string, number> = {};
+      const cityToRegion: Record<string, string> = {};
+      customerData.forEach(item => {
+        cityMap[item.city] = (cityMap[item.city] || 0) + item.total;
+        if (!cityToRegion[item.city]) cityToRegion[item.city] = item.region;
+      });
+      const tot = Object.values(cityMap).reduce((a, b) => a + b, 0);
       const threshold = tot * 0.05;
       let other = 0;
-      Object.entries(map).forEach(([name, value]) => {
+      Object.entries(cityMap).forEach(([name, value]) => {
         if (value >= threshold) data.push({ name, value });
         else other += value;
       });
       if (other > 0) data.push({ name: '其他', value: other });
-      data.sort((a, b) => b.value - a.value);
+      // Sort by region group, then by value within group
+      const regionOrder = ['华东', '华南', '华中', '华北', '西北', '西南', '其他'];
+      data.sort((a, b) => {
+        const ra = regionOrder.indexOf(cityToRegion[a.name] || '其他');
+        const rb = regionOrder.indexOf(cityToRegion[b.name] || '其他');
+        if (ra !== rb) return ra - rb;
+        return b.value - a.value;
+      });
     }
     return data;
   }, [customerData, customerChartView]);