feat(erp/erpProjectPlan): 优化甘特图任务时间展示

- 添加计划最晚结束时间字段展示任务最晚结束日期
- 任务日期轴将同一天的任务用散点图表示，避免零宽度矩形不可见
- 计划进度和实际进度均拆分为条形和散点两种数据分别渲染
- 重新组织任务渲染数据，确保时间轴显示更准确更清晰
- 保持任务实际进度和计划进度在图表上的一致性和区分度

src/views/oa/erp/erpProjectPlan/gantt.vue

@@ -30,8 +30,8 @@
         <el-descriptions-item label="任务数量">
           {{ taskList.length }}
         </el-descriptions-item>
-        <el-descriptions-item label="最后同步时间">
-          {{ formatDisplayDate(new Date()) }}
+        <el-descriptions-item label="计划最晚结束时间">
+          {{ lastPlanEndDate }}
         </el-descriptions-item>
       </el-descriptions>
 
@@ -129,6 +129,25 @@ const planStatusLabel = computed(() => {
   return statusMap.value[planDetail.value.projectPlanStatus] || planDetail.value.projectPlanStatus;
 });
 
+const lastPlanEndDate = computed(() => {
+  if (!taskList.value.length) {
+    return '-';
+  }
+  let maxTs: number | null = null;
+  taskList.value.forEach(task => {
+    const ts = toTimestamp(task.planEnd);
+    if (ts !== null) {
+      if (maxTs === null || ts > maxTs) {
+        maxTs = ts;
+      }
+    }
+  });
+  if (maxTs === null) {
+    return '-';
+  }
+  return formatDisplayDate(new Date(maxTs));
+});
+
 const projectPlanId = computed(() => route.params.projectPlanId as string);
 
 const renderGanttItem = (params: any, api: any) => {
@@ -180,41 +199,65 @@ const updateChart = () => {
   let min = Number.POSITIVE_INFINITY;
   let max = Number.NEGATIVE_INFINITY;
 
-  const planData = taskList.value
-    .map((task, index) => {
-      const start = toTimestamp(task.planStart);
-      const end = toTimestamp(task.planEnd);
-      if (start === null || end === null || end < start) {
-        return null;
-      }
+  const planBarData: any[] = [];
+  const planPointData: any[] = [];
+
+  taskList.value.forEach((task, index) => {
+    const start = toTimestamp(task.planStart);
+    const end = toTimestamp(task.planEnd);
+    if (start === null || end === null) {
+      return;
+    }
+    // 同一天的任务使用散点展示，避免零宽度矩形不可见
+    if (end <= start) {
+      min = Math.min(min, start);
+      max = Math.max(max, start);
+      planPointData.push({
+        name: task.taskName,
+        value: [start, index],
+        task
+      });
+    } else {
       min = Math.min(min, start);
       max = Math.max(max, end);
-      return {
+      planBarData.push({
         name: task.taskName,
         value: [index, start, end],
         task
-      };
-    })
-    .filter(Boolean) as Array<{ name: string; value: [number, number, number]; task: GanttTask }>;
+      });
+    }
+  });
 
-  const actualData = showActual.value
-    ? (taskList.value
-        .map((task, index) => {
-          const start = toTimestamp(task.realStart);
-          const end = toTimestamp(task.realEnd);
-          if (start === null || end === null || end < start) {
-            return null;
-          }
-          min = Math.min(min, start);
-          max = Math.max(max, end);
-          return {
-            name: `${task.taskName}-实际`,
-            value: [index, start, end],
-            task
-          };
-        })
-        .filter(Boolean) as Array<{ name: string; value: [number, number, number]; task: GanttTask }>)
-    : [];
+  const actualBarData: any[] = [];
+  const actualPointData: any[] = [];
+
+  if (showActual.value) {
+    taskList.value.forEach((task, index) => {
+      const start = toTimestamp(task.realStart);
+      const end = toTimestamp(task.realEnd);
+      if (start === null || end === null) {
+        return;
+      }
+      // 实际进度同一天也使用散点展示
+      if (end <= start) {
+        min = Math.min(min, start);
+        max = Math.max(max, start);
+        actualPointData.push({
+          name: `${task.taskName}-实际`,
+          value: [start, index],
+          task
+        });
+      } else {
+        min = Math.min(min, start);
+        max = Math.max(max, end);
+        actualBarData.push({
+          name: `${task.taskName}-实际`,
+          value: [index, start, end],
+          task
+        });
+      }
+    });
+  }
 
   if (min === Number.POSITIVE_INFINITY || max === Number.NEGATIVE_INFINITY) {
     const now = Date.now();
@@ -223,24 +266,42 @@ const updateChart = () => {
   }
 
   const series: any[] = [];
-  if (planData.length) {
+  if (planBarData.length) {
     series.push({
       name: '计划进度',
       type: 'custom',
       renderItem: renderGanttItem,
       itemStyle: { color: '#91cc75', opacity: 0.9 },
       encode: { x: [1, 2], y: 0 },
-      data: planData
+      data: planBarData
     });
   }
-  if (actualData.length) {
+  if (planPointData.length) {
+    series.push({
+      name: '计划进度(单日)',
+      type: 'scatter',
+      symbolSize: 10,
+      itemStyle: { color: '#91cc75', opacity: 0.9 },
+      data: planPointData
+    });
+  }
+  if (actualBarData.length) {
     series.push({
       name: '实际进度',
       type: 'custom',
       renderItem: renderGanttItem,
       itemStyle: { color: '#5470c6', opacity: 0.75 },
       encode: { x: [1, 2], y: 0 },
-      data: actualData
+      data: actualBarData
+    });
+  }
+  if (actualPointData.length) {
+    series.push({
+      name: '实际进度(单日)',
+      type: 'scatter',
+      symbolSize: 10,
+      itemStyle: { color: '#5470c6', opacity: 0.75 },
+      data: actualPointData
     });
   }