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。

server/tests/test_expense_claim_service.py

@@ -2883,6 +2883,133 @@ def test_direct_manager_can_approve_subordinate_claim_to_finance_review() -> Non
         )
 
 
+def test_application_submit_skips_ai_review_and_receipt_requirements(monkeypatch: pytest.MonkeyPatch) -> None:
+    current_user = CurrentUserContext(
+        username="application-owner@example.com",
+        name="张三",
+        role_codes=["employee"],
+        is_admin=True,
+    )
+
+    with build_session() as db:
+        claim = ExpenseClaim(
+            claim_no="APP-20260525-SUBMIT",
+            employee_name="张三",
+            department_name="交付部",
+            project_code="PRJ-A",
+            expense_type="travel_application",
+            reason="支撑国网服务器上线部署",
+            location="上海",
+            amount=Decimal("12000.00"),
+            currency="CNY",
+            invoice_count=0,
+            occurred_at=datetime(2026, 5, 25, 9, 0, tzinfo=UTC),
+            submitted_at=None,
+            status="draft",
+            approval_stage="待提交",
+            risk_flags_json=[
+                {
+                    "source": "submission_review",
+                    "severity": "medium",
+                    "message": "旧 AI 预审提示不应保留到申请单提交结果。",
+                }
+            ],
+        )
+        db.add(claim)
+        db.commit()
+        claim_id = claim.id
+        service = ExpenseClaimService(db)
+
+        def fail_ai_review(_claim: ExpenseClaim) -> dict[str, object]:
+            raise AssertionError("费用申请提交不应进入 AI 预审")
+
+        monkeypatch.setattr(service, "_run_ai_submission_review", fail_ai_review)
+
+        submitted = service.submit_claim(claim_id, current_user)
+
+        assert submitted is not None
+        assert submitted.status == "submitted"
+        assert submitted.approval_stage == "直属领导审批"
+        assert submitted.invoice_count == 0
+        assert submitted.items == []
+        assert not any(
+            isinstance(flag, dict) and flag.get("source") == "submission_review"
+            for flag in submitted.risk_flags_json
+        )
+        assert any(
+            isinstance(flag, dict)
+            and flag.get("source") == "application_submission"
+            and flag.get("event_type") == "expense_application_submission"
+            and flag.get("next_approval_stage") == "直属领导审批"
+            for flag in submitted.risk_flags_json
+        )
+
+
+def test_direct_manager_can_approve_application_claim_to_completed_stage() -> None:
+    current_user = CurrentUserContext(
+        username="manager-application-approve@example.com",
+        name="李经理",
+        role_codes=["manager"],
+        is_admin=False,
+    )
+
+    with build_session() as db:
+        manager = Employee(
+            employee_no="E8112",
+            name="李经理",
+            email="manager-application-approve@example.com",
+        )
+        employee = Employee(
+            employee_no="E8113",
+            name="张三",
+            email="zhangsan-application-approve@example.com",
+            manager=manager,
+        )
+        db.add_all([manager, employee])
+        db.flush()
+        claim = ExpenseClaim(
+            claim_no="APP-20260525-APPROVE",
+            employee_id=employee.id,
+            employee_name="张三",
+            department_name="交付部",
+            project_code="PRJ-A",
+            expense_type="travel_application",
+            reason="支撑国网服务器上线部署",
+            location="上海",
+            amount=Decimal("12000.00"),
+            currency="CNY",
+            invoice_count=0,
+            occurred_at=datetime(2026, 5, 25, 9, 0, tzinfo=UTC),
+            submitted_at=datetime(2026, 5, 25, 10, 0, tzinfo=UTC),
+            status="submitted",
+            approval_stage="直属领导审批",
+            risk_flags_json=[],
+        )
+        db.add(claim)
+        db.commit()
+        claim_id = claim.id
+
+        approved = ExpenseClaimService(db).approve_claim(
+            claim_id,
+            current_user,
+            opinion="业务必要，同意申请。",
+        )
+
+        assert approved is not None
+        assert approved.status == "approved"
+        assert approved.approval_stage == "审批完成"
+        assert any(
+            isinstance(flag, dict)
+            and flag.get("source") == "manual_approval"
+            and flag.get("event_type") == "expense_application_approval"
+            and flag.get("opinion") == "业务必要，同意申请。"
+            and flag.get("previous_approval_stage") == "直属领导审批"
+            and flag.get("next_status") == "approved"
+            and flag.get("next_approval_stage") == "审批完成"
+            for flag in approved.risk_flags_json
+        )
+
+
 def test_finance_can_approve_claim_to_archive_stage() -> None:
     current_user = CurrentUserContext(
         username="finance-approve@example.com",