fix: restore EchartsBulletChartPlugin import lost in conflict resolution

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: claude

superset-frontend/src/visualizations/presets/MainPreset.ts

@@ -64,6 +64,7 @@ import {
   EchartsHeatmapChartPlugin,
   EchartsGanttChartPlugin,
   EchartsTimePivotChartPlugin,
+  EchartsBulletChartPlugin,
 } from '@superset-ui/plugin-chart-echarts';
 import {
   SelectFilterPlugin,