feat: 完善文档中心与报销申请交互及侧边栏重构

后端优化编排器报销查询和本体检测精度，增强报销单草稿保
存和附件回填逻辑，前端重构侧边栏组件支持折叠和图标导
航，完善文档中心状态筛选和详情提示，报销创建和审批详情
页优化会话管理和费用明细交互，新增助手应用服务和预设动
作工具函数，补充单元测试覆盖。

web/tests/document-center-new-state.test.mjs

@@ -0,0 +1,60 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import {
+  countNewDocuments,
+  isNewDocument,
+  markDocumentViewed,
+  readDocumentScope,
+  readViewedDocumentKeys,
+  resolveDocumentNewKey,
+  writeDocumentScope
+} from '../src/utils/documentCenterNewState.js'
+
+function createMemoryStorage(initial = {}) {
+  const store = new Map(Object.entries(initial))
+  return {
+    getItem(key) {
+      return store.has(key) ? store.get(key) : null
+    },
+    setItem(key, value) {
+      store.set(key, value)
+    }
+  }
+}
+
+test('document center new state resolves source scoped document keys', () => {
+  assert.equal(resolveDocumentNewKey({ source: 'archive', claimId: 'claim-1' }), 'archive:claim-1')
+  assert.equal(resolveDocumentNewKey({ source: 'approval', documentNo: 'EXP-1' }), 'approval:EXP-1')
+})
+
+test('document center new state counts unseen documents and persists viewed rows', () => {
+  const storage = createMemoryStorage()
+  const rows = [
+    { source: 'archive', claimId: 'claim-1' },
+    { source: 'archive', claimId: 'claim-2' }
+  ]
+  let viewedKeys = readViewedDocumentKeys(storage)
+
+  assert.equal(countNewDocuments(rows, viewedKeys), 2)
+  assert.equal(isNewDocument(rows[0], viewedKeys), true)
+
+  viewedKeys = markDocumentViewed(rows[0], viewedKeys, storage)
+
+  assert.equal(countNewDocuments(rows, viewedKeys), 1)
+  assert.equal(isNewDocument(rows[0], viewedKeys), false)
+  assert.deepEqual([...readViewedDocumentKeys(storage)], ['archive:claim-1'])
+})
+
+test('document center scope state restores only allowed tabs', () => {
+  const storage = createMemoryStorage()
+  const scopes = ['全部', '申请单', '报销单', '审核单', '归档']
+
+  assert.equal(readDocumentScope('全部', scopes, storage), '全部')
+
+  writeDocumentScope('归档', scopes, storage)
+  assert.equal(readDocumentScope('全部', scopes, storage), '归档')
+
+  writeDocumentScope('不存在', scopes, storage)
+  assert.equal(readDocumentScope('全部', scopes, storage), '归档')
+})