fix(web): 保存草稿/提交成功后也推进到下一个 task

之前多 task 串行推进只在 steward action 执行链(executeInlineStewardAction)
生效,但保存草稿走的是 application preview 流(executeInlineApplicationPreviewAction),
成功后只显示'查看单据',不会提示继续下一个报销 task。

- startAiApplicationPreviewFromAction 透传 steward_remaining_tasks 到 preview message
- startAiApplicationPreview 把 stewardRemainingTasks 存到 message 上
- executeInlineApplicationPreviewAction 成功后:检查 targetMessage.stewardRemainingTasks,
  有剩余 task 则追加'继续处理费用报销'按钮(复用 steward_confirm_flow 分支)
- 新增 buildApplicationPreviewNextTaskAction 辅助函数

现在保存草稿/提交申请成功后,用户会看到:[查看单据] [继续处理费用报销]

web/src/composables/workbenchAiMode/useWorkbenchAiApplicationPreviewFlow.js

@@ -330,6 +330,38 @@ export function useWorkbenchAiApplicationPreviewFlow({
     }
   }
 
+  function buildApplicationPreviewNextTaskAction(targetMessage) {
+    // 多 task 串行推进:申请草稿保存/提交成功后,检查是否有剩余 task(如报销),
+    // 有则生成"继续处理下一个任务"按钮,让用户一键推进。
+    const remainingTasks = Array.isArray(targetMessage?.stewardRemainingTasks)
+      ? targetMessage.stewardRemainingTasks
+      : []
+    const nextTask = remainingTasks[0]
+    if (!nextTask || !nextTask.task_type) {
+      return null
+    }
+    const taskType = String(nextTask.task_type || '').trim()
+    const isApplication = taskType === 'expense_application'
+    const flowId = isApplication ? 'travel_application' : 'travel_reimbursement'
+    const taskLabel = isApplication ? '出差申请' : '费用报销'
+    const ontologyFields = nextTask.ontology_fields || nextTask.ontologyFields || {}
+    return {
+      label: `继续处理${taskLabel}`,
+      description: `接下来处理${taskLabel}：${String(nextTask.summary || nextTask.title || '').slice(0, 40)}`,
+      icon: isApplication ? 'mdi mdi-file-plus-outline' : 'mdi mdi-receipt-text-plus-outline',
+      action_type: 'steward_continue_next_task',
+      payload: {
+        steward_confirm_flow: true,
+        flow_id: flowId,
+        steward_current_task: nextTask,
+        expense_type: String(ontologyFields.expense_type || 'travel').trim() || 'travel',
+        expense_type_label: String(ontologyFields.expense_type_label || '差旅费').trim() || '差旅费',
+        ontology_fields: ontologyFields,
+        original_message: String(nextTask.summary || nextTask.title || `继续处理${taskLabel}`).trim()
+      }
+    }
+  }
+
   async function executeInlineApplicationPreviewAction(actionType, sourceMessage = null, options = {}) {
     const targetMessage = sourceMessage?.applicationPreview ? sourceMessage : resolveLatestInlineApplicationPreviewMessage()
     if (!targetMessage?.applicationPreview) {
@@ -424,6 +456,8 @@ export function useWorkbenchAiApplicationPreviewFlow({
         targetMessage.draftPayload = draftPayload
       }
       targetMessage.suggestedActions = []
+      const detailActions = buildInlineApplicationDetailAction(draftPayload)
+      const nextTaskAction = buildApplicationPreviewNextTaskAction(targetMessage)
       replaceInlineMessage(
         pendingMessage.id,
         createInlineMessage('assistant', buildInlineApplicationPreviewActionResultText(actionType, payload), {
@@ -432,7 +466,7 @@ export function useWorkbenchAiApplicationPreviewFlow({
             streamStatus: 'completed',
             thinkingEvents: completeInlineThinkingEvents(resolveInlineThinkingEvents(pendingMessage))
           },
-          suggestedActions: buildInlineApplicationDetailAction(draftPayload)
+          suggestedActions: nextTaskAction ? [...detailActions, nextTaskAction] : detailActions
         })
       )
       persistCurrentConversation()
@@ -552,9 +586,10 @@ export function useWorkbenchAiApplicationPreviewFlow({
         suggestedActions: buildInlineApplicationPreviewSuggestedActions(preview),
         requestedSubmit: Boolean(options.requestedSubmit),
         submitRequiresConfirmation: Boolean(options.submitRequiresConfirmation),
+        stewardRemainingTasks: Array.isArray(options.stewardRemainingTasks) ? options.stewardRemainingTasks : [],
         stewardPlan: {
           streamStatus: 'completed',
-          thinkingEvents: completeInlineThinkingEvents(resolveInlineThinkingEvents(pendingMessage))
+          thinkingEvents: completeWorkbenchAiThinkingEvents(resolveInlineThinkingEvents(pendingMessage))
         },
         text: content
       })

web/src/composables/workbenchAiMode/useWorkbenchAiExpenseFlow.js

@@ -143,7 +143,12 @@ export function useWorkbenchAiExpenseFlow({
     return startAiApplicationPreview(
       expenseType,
       expenseTypeLabel,
-      payload.carry_text || resolveLatestInlineUserPrompt()
+      payload.carry_text || resolveLatestInlineUserPrompt(),
+      {
+        stewardRemainingTasks: Array.isArray(payload.steward_remaining_tasks)
+          ? payload.steward_remaining_tasks
+          : []
+      }
     )
   }