feat(ai): unify verified expense application workflow

web/src/composables/workbenchAiMode/useWorkbenchAiActionRouter.js

@@ -53,6 +53,15 @@ export function useWorkbenchAiActionRouter({
 
     const actionType = String(action?.action_type || '').trim()
     const actionPayload = action?.payload && typeof action.payload === 'object' ? action.payload : {}
+    if (
+      actionPayload.steward_execute_action
+      && String(actionPayload.steward_current_task?.task_type || '').trim() === 'expense_application'
+    ) {
+      // 费用申请必须先进入结构化预览签发流程，不能从 Steward 计划直接执行保存/提交。
+      aiExpenseDraft.value = null
+      void expenseFlow.startAiApplicationPreviewFromAction(actionPayload)
+      return
+    }
     if (actionPayload.steward_execute_action) {
       return executeInlineStewardAction(action, sourceMessage)
     }