feat(web): AI 工作台多 task 串行推进与会话适配

- useWorkbenchAiApplicationPreviewFlow/useWorkbenchAiActionRouter/useWorkbenchAiCommandIntents 支持 task1 完成后自动推进 task2，确认按钮直接拉起申请预览，草稿/提交成功后继续推进下一 task
- workbenchAiIntentPlannerModel/workbenchAiMessageModel/workbenchAiCommandIntentModel 适配多 task 意图规划与消息结构
- aiApplicationPreviewActions/aiApplicationPrecheckModel/aiExpenseDraftModel/aiWorkbenchConversationStore 草稿与会话存储适配
- PersonalWorkbenchAiMode 与样式适配，更新 preview-actions/expense-draft/conversation-store/fast-preview/action-router/command-intent/intent-planner 测试

web/src/composables/workbenchAiMode/usePersonalWorkbenchAiMode.js

@@ -258,7 +258,8 @@ export function usePersonalWorkbenchAiMode(props, emit) {
     resolveLatestInlineUserPrompt,
     scrollInlineConversationToBottom,
     sending,
-    toast
+    toast,
+    onApplicationActionCompleted: startModelPlannedNextTask
   })
 
   const expenseFlow = useWorkbenchAiExpenseFlow({
@@ -710,6 +711,46 @@ export function usePersonalWorkbenchAiMode(props, emit) {
     return pendingMessage
   }
 
+  function buildModelPlannedNextTaskAction(remainingTasks = []) {
+    const tasks = Array.isArray(remainingTasks) ? remainingTasks : []
+    const nextTask = tasks[0]
+    if (!nextTask || typeof nextTask !== 'object') {
+      return null
+    }
+    const taskType = String(nextTask.task_type || nextTask.taskType || '').trim()
+    const assignedAgent = String(nextTask.assigned_agent || nextTask.assignedAgent || '').trim()
+    const isApplication = taskType === 'expense_application' || assignedAgent === 'application_assistant'
+    const isReimbursement = taskType === 'reimbursement' || assignedAgent === 'reimbursement_assistant'
+    if (!isApplication && !isReimbursement) {
+      return null
+    }
+    const ontologyFields = nextTask.ontology_fields || nextTask.ontologyFields || {}
+    const flowId = isApplication ? 'travel_application' : 'travel_reimbursement'
+    const taskLabel = isApplication ? '出差申请' : '费用报销'
+    return {
+      label: `继续处理${taskLabel}`,
+      action_type: 'steward_continue_next_task',
+      payload: {
+        steward_confirm_flow: true,
+        flow_id: flowId,
+        steward_current_task: nextTask,
+        expense_type: String(ontologyFields.expense_type || 'travel').trim() || 'travel',
+        expense_type_label: String(ontologyFields.expense_type_label || '差旅费').trim() || '差旅费',
+        ontology_fields: ontologyFields,
+        original_message: String(nextTask.summary || nextTask.title || `继续处理${taskLabel}`).trim(),
+        steward_remaining_tasks: tasks.slice(1)
+      }
+    }
+  }
+
+  function startModelPlannedNextTask(remainingTasks = []) {
+    const nextTaskAction = buildModelPlannedNextTaskAction(remainingTasks)
+    if (!nextTaskAction) {
+      return
+    }
+    actionRouter.handleInlineSuggestedAction(nextTaskAction)
+  }
+
   function startModelPlannedApplicationPreview(travelApplicationRequest, plannerPendingMessage = null) {
     void applicationFlow.startAiApplicationPreview(
       travelApplicationRequest.expenseType,
@@ -723,7 +764,10 @@ export function usePersonalWorkbenchAiMode(props, emit) {
         autoSubmit: travelApplicationRequest.autoSubmit,
         autoSaveDraft: travelApplicationRequest.autoSaveDraft,
         requestedSubmit: travelApplicationRequest.requestedSubmit,
-        submitRequiresConfirmation: travelApplicationRequest.submitRequiresConfirmation
+        submitRequiresConfirmation: travelApplicationRequest.submitRequiresConfirmation,
+        stewardRemainingTasks: travelApplicationRequest.stewardRemainingTasks,
+        onPreviewReadyForNextTask: startModelPlannedNextTask,
+        onApplicationActionCompleted: startModelPlannedNextTask
       }
     )
   }
@@ -741,7 +785,8 @@ export function usePersonalWorkbenchAiMode(props, emit) {
         autoSubmit: travelApplicationRequest.autoSubmit,
         autoSaveDraft: travelApplicationRequest.autoSaveDraft,
         requestedSubmit: travelApplicationRequest.requestedSubmit,
-        submitRequiresConfirmation: travelApplicationRequest.submitRequiresConfirmation
+        submitRequiresConfirmation: travelApplicationRequest.submitRequiresConfirmation,
+        stewardRemainingTasks: travelApplicationRequest.stewardRemainingTasks
       }
     }
     replaceInlineMessage(plannerPendingMessage.id, createInlineMessage('assistant', confirmText, {