fix(expense): narrow travel route risk indicators

web/tests/travel-request-detail-risk-advice.test.mjs

@@ -659,6 +659,22 @@ test('legacy route-level risk cards infer affected travel rows when backend has
         detail: '起始地-目的地',
         invoiceId: 'transfer.png'
       },
+      {
+        id: 'train-transfer-return',
+        name: '火车票',
+        category: '火车票',
+        desc: '深圳-上海',
+        detail: '起始地-目的地',
+        invoiceId: 'transfer-return.png'
+      },
+      {
+        id: 'train-return',
+        name: '火车票',
+        category: '火车票',
+        desc: '上海-武汉',
+        detail: '起始地-目的地',
+        invoiceId: 'return.png'
+      },
       {
         id: 'allowance-row',
         name: '出差补贴',
@@ -678,7 +694,59 @@ test('legacy route-level risk cards infer affected travel rows when backend has
   })
 
   assert.equal(riskCards.length, 1)
-  assert.deepEqual(riskCards[0].itemIds, ['train-outbound', 'train-transfer'])
+  assert.deepEqual(riskCards[0].itemIds, ['train-transfer', 'train-transfer-return'])
+})
+
+test('route-level risk cards narrow broad backend item ids to abnormal route rows', () => {
+  const expenseItems = [
+    {
+      id: 'train-outbound',
+      name: '火车票',
+      category: '火车票',
+      desc: '武汉-上海',
+      detail: '起始地-目的地',
+      invoiceId: 'outbound.png'
+    },
+    {
+      id: 'train-transfer',
+      name: '火车票',
+      category: '火车票',
+      desc: '上海-深圳',
+      detail: '起始地-目的地',
+      invoiceId: 'transfer.png'
+    },
+    {
+      id: 'train-transfer-return',
+      name: '火车票',
+      category: '火车票',
+      desc: '深圳-上海',
+      detail: '起始地-目的地',
+      invoiceId: 'transfer-return.png'
+    },
+    {
+      id: 'train-return',
+      name: '火车票',
+      category: '火车票',
+      desc: '上海-武汉',
+      detail: '起始地-目的地',
+      invoiceId: 'return.png'
+    }
+  ]
+  const riskCards = buildAttachmentRiskCards({
+    expenseItems,
+    claimRiskFlags: [
+      {
+        source: 'submission_review',
+        severity: 'high',
+        label: '多城市行程待说明',
+        message: '本次报销识别到多城市行程（上海、武汉、深圳），但事由中未说明中转、多地拜访或改签原因。',
+        item_ids: expenseItems.map((item) => item.id)
+      }
+    ]
+  })
+
+  assert.equal(riskCards.length, 1)
+  assert.deepEqual(riskCards[0].itemIds, ['train-transfer', 'train-transfer-return'])
 })
 
 test('AI advice shows only the latest manual return while preserving return count context', () => {