feat: 完善审批退回流程与报销申请关联

后端优化报销单访问策略和常量定义，增强退回原因和审批状态
流转，前端完善退回对话框和审批交互组件，新增报销申请关联
模型，优化文档中心行数据和审批收件箱工具函数，增强引导
流程和会话模型，补充单元测试覆盖。

web/tests/requestProgressSteps.test.mjs

@@ -3,12 +3,21 @@ import test from 'node:test'
 
 import { mapExpenseClaimToRequest } from '../src/composables/useRequests.js'
 
+const CREATE_APPLICATION = '\u521b\u5efa\u7533\u8bf7'
+const DIRECT_MANAGER_APPROVAL = '\u76f4\u5c5e\u9886\u5bfc\u5ba1\u6279'
+const APPROVAL_COMPLETED = '\u5ba1\u6279\u5b8c\u6210'
+const RETURNED = '\u9000\u56de'
+const WAIT_SUBMIT = '\u5f85\u63d0\u4ea4'
+const WAIT_LEADER_LI_APPROVAL = '\u7b49\u5f85 Leader Li \u6279\u590d'
+const LEADER_RETURNED_STATUS = '\u9886\u5bfc\u5df2\u9000\u56de\uff0c\u5f85\u91cd\u65b0\u63d0\u4ea4'
+
 test('application claims are mapped as application documents', () => {
   const request = mapExpenseClaimToRequest({
     id: 'claim-application-1',
     claim_no: 'AP-20260525103045-ABCDEFGH',
     employee_name: '张三',
     department_name: '交付部',
+    manager_name: 'Leader Li',
     expense_type: 'travel_application',
     reason: '支撑国网服务器上线部署',
     location: '上海',
@@ -32,11 +41,59 @@ test('application claims are mapped as application documents', () => {
   assert.equal(request.expenseTableSummary, '预计金额已随申请提交')
   assert.deepEqual(
     request.progressSteps.map((step) => step.label),
-    ['创建申请', '直属领导审批', '审批完成']
+    [CREATE_APPLICATION, WAIT_LEADER_LI_APPROVAL, APPROVAL_COMPLETED]
   )
   assert.equal(request.progressSteps.some((step) => step.label === 'AI预审'), false)
   assert.equal(request.progressSteps.some((step) => step.label === '财务审批'), false)
-  assert.equal(request.progressSteps.find((step) => step.label === '直属领导审批')?.current, true)
+  assert.equal(request.progressSteps.some((step) => step.label === DIRECT_MANAGER_APPROVAL), false)
+  assert.equal(request.progressSteps.find((step) => step.label === WAIT_LEADER_LI_APPROVAL)?.rawLabel, DIRECT_MANAGER_APPROVAL)
+  assert.equal(request.progressSteps.find((step) => step.label === WAIT_LEADER_LI_APPROVAL)?.current, true)
+})
+
+test('returned application claims include leader return node and supplement status', () => {
+  const request = mapExpenseClaimToRequest({
+    id: 'claim-application-returned',
+    claim_no: 'APP-20260525-RETURNED',
+    employee_name: 'Applicant Zhang',
+    department_name: 'Delivery',
+    manager_name: 'Leader Li',
+    expense_type: 'travel_application',
+    reason: 'Project onsite support',
+    location: 'Shanghai',
+    amount: 12000,
+    invoice_count: 0,
+    occurred_at: '2026-05-25T00:00:00.000Z',
+    submitted_at: null,
+    created_at: '2026-05-25T01:30:00.000Z',
+    updated_at: '2026-05-25T04:00:00.000Z',
+    status: 'returned',
+    approval_stage: WAIT_SUBMIT,
+    risk_flags_json: [
+      {
+        source: 'manual_return',
+        event_type: 'expense_application_return',
+        operator: 'Leader Li',
+        opinion: 'Need clearer budget explanation.',
+        return_stage_key: 'direct_manager',
+        next_status: 'returned',
+        next_approval_stage: WAIT_SUBMIT,
+        return_count: 2,
+        created_at: '2026-05-25T04:00:00.000Z'
+      }
+    ],
+    items: []
+  })
+
+  assert.deepEqual(
+    request.progressSteps.map((step) => step.label),
+    [CREATE_APPLICATION, WAIT_LEADER_LI_APPROVAL, RETURNED, WAIT_SUBMIT]
+  )
+  assert.equal(request.progressSteps.find((step) => step.label === RETURNED)?.time, 'Leader Li\u9000\u56de')
+  assert.match(request.progressSteps.find((step) => step.label === RETURNED)?.detail, /2026-05-25/)
+  assert.equal(request.progressSteps.find((step) => step.label === WAIT_SUBMIT)?.current, true)
+  assert.equal(request.secondaryStatusValue, LEADER_RETURNED_STATUS)
+  assert.equal(request.secondaryStatusTone, 'warning')
+  assert.equal(request.progressSteps.some((step) => step.label === APPROVAL_COMPLETED), false)
 })
 
 test('approved application claims complete after direct manager approval only', () => {