fix: 销毁实例时不清空主题配置

Author: DymoneLewis

packages/core/src/LogicFlow.tsx

@@ -1445,7 +1445,6 @@ export class LogicFlow {
     this.graphModel.destroy()
     this.tool.destroy()
     this.history.destroy()
-    clearThemeMode()
     for (const extensionName in this.extension) {
       const extensionInstance = this.extension[extensionName]
       if ('destroy' in extensionInstance) {

packages/core/src/view/overlay/OutlineOverlay.tsx

@@ -31,7 +31,7 @@ export class OutlineOverlay extends Component<IProps> {
           (nodeSelectedOutline && isSelected) ||
           (hoverOutline && isHovered)
         ) {
-          const style = element.getOutlineStyle()
+          const style = element.getOutlineStyle() || {}
           let attributes = {}
           Object.keys(style).forEach((key) => {
             if (key !== 'hover') {