fix: ensure complete StyleConfig defaults in ECharts builder

Root cause: backend returns minimal style object without title/legend/axis
sub-objects, causing TypeError 'Cannot read properties of undefined'.
Fix: normalize style with full defaults at the builder entry point,
protecting ALL chart type builders uniformly.
Also fix antd deprecation warnings (destroyOnClose -> destroyOnHidden).

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

frontend/src/adapters/gateways/EChartsOptionBuilder/index.ts

@@ -1,5 +1,6 @@
 import { type IChartRenderer } from '@/application/ports/output/IChartRenderer';
 import { type ChartInstance } from '@/domain/entities/ChartInstance';
+import { type StyleConfig } from '@/domain/entities/StyleConfig';
 import { buildBarOption } from './barOptionBuilder';
 import { buildLineOption } from './lineOptionBuilder';
 import { buildPieOption } from './pieOptionBuilder';
@@ -10,44 +11,64 @@ import { buildMapOption } from './mapOptionBuilder';
 import { buildWordcloudOption } from './wordcloudOptionBuilder';
 import { buildComboOption } from './comboOptionBuilder';
 
+const DEFAULT_STYLE: StyleConfig = {
+  title: { text: '', visible: false, fontSize: 16, fontWeight: 'bold', color: '#333', align: 'left' },
+  colors: ['#5470c6', '#91cc75', '#fac858', '#ee6666', '#73c0de', '#3ba272', '#fc8452', '#9a60b4'],
+  legend: { visible: true, position: 'top', orient: 'horizontal', fontSize: 12, color: '#666' },
+  xAxis: { visible: true, labelVisible: true, labelFontSize: 12, labelColor: '#666', labelRotation: 0, titleVisible: false, titleText: '', gridVisible: true, gridColor: '#eee' },
+  yAxis: { visible: true, labelVisible: true, labelFontSize: 12, labelColor: '#666', labelRotation: 0, titleVisible: false, titleText: '', gridVisible: true, gridColor: '#eee' },
+  dataLabel: { visible: false, fontSize: 12, color: '#333', position: 'outside', format: 'value' },
+  background: { color: 'transparent', opacity: 1, borderRadius: 4 },
+  border: { visible: false, color: '#ddd', width: 1, style: 'solid' },
+  animation: { enabled: true, duration: 500, easing: 'ease-out' },
+};
+
+function ensureStyle(style: any): StyleConfig {
+  if (!style || typeof style !== 'object') return DEFAULT_STYLE;
+  return {
+    title: { ...DEFAULT_STYLE.title, ...(style.title ?? {}) },
+    colors: style.colors ?? DEFAULT_STYLE.colors,
+    legend: { ...DEFAULT_STYLE.legend, ...(style.legend ?? {}) },
+    xAxis: { ...DEFAULT_STYLE.xAxis, ...(style.xAxis ?? {}) },
+    yAxis: { ...DEFAULT_STYLE.yAxis, ...(style.yAxis ?? {}) },
+    dataLabel: { ...DEFAULT_STYLE.dataLabel, ...(style.dataLabel ?? {}) },
+    background: { ...DEFAULT_STYLE.background, ...(style.background ?? {}) },
+    border: { ...DEFAULT_STYLE.border, ...(style.border ?? {}) },
+    animation: { ...DEFAULT_STYLE.animation, ...(style.animation ?? {}) },
+  };
+}
+
 export class EChartsOptionBuilder implements IChartRenderer {
   build(chart: ChartInstance, data: Record<string, any>[]): Record<string, any> {
-    switch (chart.type) {
+    const safeChart = { ...chart, style: ensureStyle(chart.style) };
+
+    switch (safeChart.type) {
       case 'bar':
       case 'grouped-bar':
       case 'stacked-bar':
       case 'horizontal-bar':
-        return buildBarOption(chart, data);
-
+        return buildBarOption(safeChart, data);
       case 'line':
       case 'area':
-        return buildLineOption(chart, data);
-
+        return buildLineOption(safeChart, data);
       case 'pie':
       case 'donut':
-        return buildPieOption(chart, data);
-
+        return buildPieOption(safeChart, data);
       case 'scatter':
       case 'boston-matrix':
-        return buildScatterOption(chart, data);
-
+        return buildScatterOption(safeChart, data);
       case 'radar':
-        return buildRadarOption(chart, data);
-
+        return buildRadarOption(safeChart, data);
       case 'heatmap':
-        return buildHeatmapOption(chart, data);
-
+        return buildHeatmapOption(safeChart, data);
       case 'map':
-        return buildMapOption(chart, data);
-
+        return buildMapOption(safeChart, data);
       case 'wordcloud':
-        return buildWordcloudOption(chart, data);
-
+        return buildWordcloudOption(safeChart, data);
       case 'combo':
-        return buildComboOption(chart, data);
-
+        return buildComboOption(safeChart, data);
       default:
-        throw new Error(`Unsupported chart type: ${chart.type}`);
+        return { title: { text: 'Unsupported chart type' } };
     }
   }
 }

frontend/src/frameworks/components/dataImport/ImportModal.tsx

@@ -71,7 +71,7 @@ export default function ImportModal() {
       cancelText="取消"
       width={currentStep === 1 ? 960 : 600}
       okButtonProps={{ disabled: currentStep === 0 }}
-      destroyOnClose
+      destroyOnHidden
     >
       <Steps
         current={currentStep}

frontend/src/frameworks/components/export/ExportDialog.tsx

@@ -270,7 +270,7 @@ export const ExportDialog: React.FC = () => {
           </Button>
         </Space>
       }
-      destroyOnClose
+      destroyOnHidden
     >
       <Spin spinning={loading} tip="正在导出...">
         <div>

frontend/src/frameworks/components/template/TemplateModal.tsx

@@ -37,7 +37,7 @@ export const TemplateModal: React.FC = () => {
       okText={activeTab === 'save' ? '保存模板' : '确定'}
       cancelText="关闭"
       width={720}
-      destroyOnClose
+      destroyOnHidden
     >
       <Tabs
         activeKey={activeTab}