style：甘特图tooltip隐藏逻辑优化

src/views/mes/components/ScheduleGanttPanel.vue

@@ -209,7 +209,26 @@ const buildPreviewGanttData = (scheduleList: any[]) => {
   return { data: tasks, links }
 }
 
+const cleanupTaskTooltips = () => {
+  const tooltipsExt = (gantt.ext as any)?.tooltips
+  const tooltip = tooltipsExt?.tooltip
+  if (tooltipsExt?.detach) {
+    tooltipsExt.detach('.gantt_task_line')
+    tooltipsExt.detach('.gantt_task_content')
+  }
+  if (tooltip?.hide) {
+    tooltip.hide()
+  }
+  const node = tooltip?.getNode?.()
+  if (node) {
+    node.style.display = 'none'
+    node.style.visibility = 'hidden'
+    node.style.opacity = '0'
+  }
+}
+
 const destroyGantt = () => {
+  cleanupTaskTooltips()
   ganttEventIds.value.forEach((eventId) => gantt.detachEvent(eventId))
   ganttEventIds.value = []
   gantt.clearAll()