fix(web): 多 task 串行推进 task2 不再被预览生成时提前触发

onPreviewReadyForNextTask 在 task1 申请核对表刚生成、用户还没操作时就
提前拉起 task2,与用户后续在 task1 上的保存草稿/提交操作互相打架,导致
task2 完全无反应。移除该提前推进回调,统一由 onApplicationActionCompleted
在 task1 真正完成后再推进 task2。

- useWorkbenchAiApplicationPreviewFlow: 删除预览生成时的提前推进分支
- usePersonalWorkbenchAiMode: startModelPlannedApplicationPreview 不再传 onPreviewReadyForNextTask
- useWorkbenchAiActionRouter: 低置信确认按钮分支同步删除该回调
- 新增时序回归测试:预览生成不提前推进、保存草稿后才推进
- 更新两处源码正则断言为 doesNotMatch

web/tests/workbench-ai-intent-planner-model.test.mjs

@@ -347,10 +347,12 @@ test('workbench AI mode asks steward model plan before fallback execution', () =
   assert.match(personalWorkbenchAiModeScript, /submitRequiresConfirmation:\s*travelApplicationRequest\.submitRequiresConfirmation/)
   assert.match(personalWorkbenchAiModeScript, /ontologyFields:\s*travelApplicationRequest\.ontologyFields/)
   assert.match(personalWorkbenchAiModeScript, /stewardRemainingTasks:\s*travelApplicationRequest\.stewardRemainingTasks/)
-  assert.match(personalWorkbenchAiModeScript, /onPreviewReadyForNextTask:\s*startModelPlannedNextTask/)
   assert.match(personalWorkbenchAiModeScript, /onApplicationActionCompleted:\s*startModelPlannedNextTask/)
+  // 多 task 串行推进:预览生成时不再提前拉起下一个 task(会与用户在 task1 上的操作互相打架),
+  // 改为只在 task1 完成(保存草稿/提交)后通过 onApplicationActionCompleted 推进 task2。
+  assert.doesNotMatch(personalWorkbenchAiModeScript, /onPreviewReadyForNextTask/)
   assert.match(applicationPreviewFlowScript, /options\.autoSaveDraft/)
-  assert.match(applicationPreviewFlowScript, /options\.onPreviewReadyForNextTask/)
+  assert.doesNotMatch(applicationPreviewFlowScript, /onPreviewReadyForNextTask/)
   assert.match(applicationPreviewFlowScript, /const actionCompletedHandler = typeof options\.onApplicationActionCompleted === 'function'/)
   assert.match(applicationPreviewFlowScript, /actionCompletedHandler\(targetMessage\.stewardRemainingTasks/)
   assert.match(applicationPreviewFlowScript, /onApplicationActionCompleted:\s*options\.onApplicationActionCompleted/)