fix:关闭仪表板编辑界面时清空画布缓存，修复过滤组件回显问题

frontend/src/components/canvas/components/Toolbar.vue

@@ -138,6 +138,8 @@ export default {
 
   methods: {
     close() {
+      // 关闭页面清理缓存
+      this.clearCanvas()
       this.$emit('close-left-panel')
       this.$nextTick(() => {
         bus.$emit('PanelSwitchComponent', { name: 'PanelMain' })