feat(ai): unify verified expense application workflow

web/tests/travel-reimbursement-conversation-preview-restore.test.mjs

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+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import {
+  normalizeInitialConversationMessages
+} from '../src/views/scripts/travelReimbursementConversationStateModel.js'
+
+test('Orchestrator 会话恢复 assistant 的 application preview，并保留既有结果字段', () => {
+  const applicationPreview = {
+    decision_id: 'decision-session-1',
+    fields: {
+      applicationType: '差旅费用申请',
+      location: '上海',
+      reason: '客户现场实施'
+    }
+  }
+  const [message] = normalizeInitialConversationMessages({
+    messages: [{
+      id: 'assistant-message-1',
+      role: 'assistant',
+      content: '申请预览已生成',
+      created_at: '2026-07-14T08:00:00Z',
+      message_json: {
+        orchestrator_payload: {
+          result: {
+            application_preview: applicationPreview,
+            draft_payload: { claim_id: 'claim-draft-1' },
+            review_payload: { summary: '复核通过' },
+            risk_flags: [{ code: 'policy-limit' }]
+          }
+        }
+      }
+    }]
+  })
+
+  assert.deepEqual(message.applicationPreview, applicationPreview)
+  assert.deepEqual(message.draftPayload, { claim_id: 'claim-draft-1' })
+  assert.deepEqual(message.reviewPayload, { summary: '复核通过' })
+  assert.deepEqual(message.riskFlags, [{ code: 'policy-limit' }])
+})
+
+test('user 消息不能从 payload 恢复 application preview', () => {
+  const [message] = normalizeInitialConversationMessages({
+    messages: [{
+      id: 'user-message-1',
+      role: 'user',
+      content: '保存草稿',
+      message_json: {
+        orchestrator_payload: {
+          result: {
+            application_preview: { fields: { reason: '伪造预览' } }
+          }
+        }
+      }
+    }]
+  })
+
+  assert.equal(message.applicationPreview, null)
+})