fix(web): 优化任务列表加载与轮询逻辑

- 抛出加载失败错误而非静默清空任务列表
- 在加载任务失败时增加控制台错误日志输出
- 添加检查任务完成并停止轮询的函数
- 任务轮询采用异步方式并在适当时停止
- 使用常量替换硬编码对话框宽度限制和默认值
- 组件卸载时停止任务轮询定时器
- 移除已废弃的兼容性字段和方法映射代码

web/main.js

@@ -1215,8 +1215,7 @@ const app = createApp({
         }
         const res = await fetch(API_BASE + '/api/exports?' + qs.toString() + (qsUser() ? ('&' + qsUser().slice(1)) : ''));
         if (!res.ok) {
-          state.jobs = [];
-          return;
+          throw new Error(`加载任务列表失败: ${res.status}`);
         }
         const data = await res.json();
         const payload = data?.data || data || {};
@@ -1224,19 +1223,34 @@ const app = createApp({
         state.jobs = arr;
         state.jobsTotal = Number(payload.total || 0);
         state.jobsPage = Number(payload.page || page);
-      } catch (_e) {
+      } catch (e) {
+        console.error('加载任务列表失败:', e);
         state.jobs = [];
       }
     };
     
     let jobsPollTimer = null;
+    
+    /**
+     * 检查是否所有任务都已完成，若是则停止轮询
+     */
+    const checkAndStopPollingIfComplete = () => {
+      const hasRunningJob = state.jobs.some(job => 
+        job.status === 'queued' || job.status === 'running'
+      );
+      if (!hasRunningJob && state.jobs.length > 0) {
+        stopJobsPolling();
+      }
+    };
+    
     const startJobsPolling = () => {
       if (jobsPollTimer) return;
-      jobsPollTimer = setInterval(() => {
+      jobsPollTimer = setInterval(async () => {
         if (state.jobsVisible) {
-          loadJobs(state.jobsPage);
+          await loadJobs(state.jobsPage);
+          checkAndStopPollingIfComplete();
         }
-      }, 1000);
+      }, CONSTANTS.JOBS_POLL_INTERVAL);
     };
     
     const stopJobsPolling = () => {
@@ -1338,18 +1352,18 @@ const app = createApp({
     
     // ==================== 对话框尺寸管理 ====================
     const clampWidth = (w) => {
-      const n = Math.max(500, Math.min(1400, w));
+      const n = Math.max(CONSTANTS.DIALOG_MIN_WIDTH, Math.min(CONSTANTS.DIALOG_MAX_WIDTH, w));
       return n + 'px';
     };
     
     const resizeDialog = (kind, delta) => {
       if (kind === 'create') {
-        const cur = parseInt(String(state.createWidth).replace('px', '') || '900', 10);
+        const cur = parseInt(String(state.createWidth).replace('px', '') || String(CONSTANTS.DIALOG_DEFAULT_WIDTH), 10);
         const next = clampWidth(cur + delta);
         state.createWidth = next;
         localStorage.setItem('tplDialogWidth', next);
       } else if (kind === 'edit') {
-        const cur = parseInt(String(state.editWidth).replace('px', '') || '600', 10);
+        const cur = parseInt(String(state.editWidth).replace('px', '') || String(CONSTANTS.DIALOG_EDIT_DEFAULT_WIDTH), 10);
         const next = clampWidth(cur + delta);
         state.editWidth = next;
         localStorage.setItem('tplEditDialogWidth', next);
@@ -1429,6 +1443,11 @@ const app = createApp({
     loadTemplates();
     loadFieldsMeta(state.form.datasource, state.form.orderType);
     
+    // 组件销毁时清理定时器
+    Vue.onUnmounted(() => {
+      stopJobsPolling();
+    });
+    
     // ==================== 返回 ====================
     return {
       ...Vue.toRefs(state),
@@ -1483,11 +1502,6 @@ const app = createApp({
       editFieldTreeData,
       onTreeCheck,
       setTreeChecked,
-      // 兼容性保留（已废弃）
-      createFieldsCascader: createFieldsTree,
-      editFieldsCascader: editFieldsTree,
-      onCascaderVisible,
-      onFieldsSelChange,
       hasUserId,
       currentUserId
     };