feat: 完善差旅票据行程提取与费用明细回填逻辑

增强文档智能识别的票据场景关键词和字段提取能力，优化
会话关联草稿报销单的解析路径，修复费用明细合并和票据
去重边界问题，前端改进报销创建和审批详情交互，补充单
元测试覆盖。

server/tests/test_user_agent_service.py

@@ -477,9 +477,9 @@ def test_user_agent_model_prompt_supports_contextual_personalization() -> None:
         assert '"user_grade": "P5"' in user_prompt
 
 
-def test_user_agent_guides_generic_expense_request() -> None:
-    session_factory = build_session_factory()
-    with session_factory() as db:
+def test_user_agent_guides_generic_expense_request() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
         ontology = SemanticOntologyService(db).parse(
             OntologyParseRequest(
                 query="我要报销",
@@ -506,16 +506,61 @@ def test_user_agent_guides_generic_expense_request() -> None:
             "事由说明",
             "票据附件",
         ]
-        assert [item.action_type for item in response.review_payload.confirmation_actions] == [
-            "cancel_review",
-            "edit_review",
-            "save_draft",
-        ]
-
-
-def test_user_agent_guides_implicit_expense_draft_request() -> None:
-    session_factory = build_session_factory()
-    with session_factory() as db:
+        assert [item.action_type for item in response.review_payload.confirmation_actions] == [
+            "cancel_review",
+            "edit_review",
+        ]
+        edit_action = next(
+            item for item in response.review_payload.confirmation_actions if item.action_type == "edit_review"
+        )
+        assert edit_action.label == "选择报销类型"
+        assert edit_action.emphasis == "primary"
+
+
+def test_user_agent_asks_for_type_when_trip_context_is_ambiguous() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        message = "业务发生时间:2026-02-20 至 2026-02-23，去上海支持上海电力部署项目，申请报销"
+        ontology = SemanticOntologyService(db).parse(
+            OntologyParseRequest(
+                query=message,
+                user_id="pytest-ambiguous-type@example.com",
+            )
+        )
+        response = UserAgentService(db).respond(
+            UserAgentRequest(
+                run_id=ontology.run_id,
+                user_id="pytest-ambiguous-type@example.com",
+                message=message,
+                ontology=ontology,
+                tool_payload={"draft_only": True},
+            )
+        )
+
+        assert response.review_payload is not None
+        slot_map = {item.key: item for item in response.review_payload.slot_cards}
+        assert slot_map["expense_type"].value == ""
+        assert slot_map["expense_type"].status == "missing"
+        assert slot_map["time_range"].value == "2026-02-20 至 2026-02-23"
+        assert slot_map["location"].value == "上海"
+        assert response.review_payload.can_proceed is False
+        assert "报销类型" in response.review_payload.missing_slots
+        assert "选择报销类型" in response.review_payload.body_message
+        assert "不会重新改判报销类型" in response.review_payload.body_message
+        edit_action = next(
+            item for item in response.review_payload.confirmation_actions if item.action_type == "edit_review"
+        )
+        assert edit_action.label == "选择报销类型"
+        assert edit_action.emphasis == "primary"
+        assert [item.action_type for item in response.review_payload.confirmation_actions] == [
+            "cancel_review",
+            "edit_review",
+        ]
+
+
+def test_user_agent_guides_implicit_expense_draft_request() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
         today = datetime.now(UTC).date().isoformat()
         ontology = SemanticOntologyService(db).parse(
             OntologyParseRequest(
@@ -611,6 +656,126 @@ def test_user_agent_guides_riding_fare_as_transport_expense() -> None:
         assert "“交通费”" in response.review_payload.intent_summary
 
 
+def test_user_agent_keeps_travel_range_when_user_adds_receipts_after_text_context() -> None:
+    session_factory = build_session_factory()
+    with session_factory() as db:
+        message = "业务发生时间:2026-02-20 至 2026-02-23，去上海支撑上海电力 服务器部署，出差3天"
+        ontology = SemanticOntologyService(db).parse(
+            OntologyParseRequest(
+                query=message,
+                user_id="pytest-travel-range@example.com",
+            )
+        )
+        initial_response = UserAgentService(db).respond(
+            UserAgentRequest(
+                run_id=ontology.run_id,
+                user_id="pytest-travel-range@example.com",
+                message=message,
+                ontology=ontology,
+                tool_payload={"draft_only": True},
+            )
+        )
+
+        assert initial_response.review_payload is not None
+        initial_slots = {item.key: item for item in initial_response.review_payload.slot_cards}
+        assert initial_slots["expense_type"].normalized_value == "travel"
+        assert initial_slots["time_range"].value == "2026-02-20 至 2026-02-23"
+        assert initial_slots["location"].value == "上海"
+        assert "业务发生时间" not in initial_slots["reason"].raw_value
+        assert not initial_slots["reason"].value.startswith("至 2026-02-23")
+
+        followup_context = {
+            "name": "张三",
+            "grade": "P4",
+            "review_action": "link_to_existing_draft",
+            "review_form_values": {
+                "expense_type": "差旅费",
+                "occurred_date": "2026-02-20",
+                "time_range": "2026-02-20 至 2026-02-23",
+                "business_time": "2026-02-20 至 2026-02-23",
+                "business_location": "上海",
+                "reason": "去上海支撑上海电力服务器部署，出差3天",
+            },
+            "business_time_context": {
+                "mode": "range",
+                "start_date": "2026-02-20",
+                "end_date": "2026-02-23",
+                "display_value": "2026-02-20 至 2026-02-23",
+            },
+            "attachment_names": ["2月20_武汉-上海.pdf", "2月23_上海-武汉.pdf", "上海酒店发票.pdf"],
+            "attachment_count": 3,
+            "ocr_documents": [
+                {
+                    "filename": "2月20_武汉-上海.pdf",
+                    "document_type": "train_ticket",
+                    "scene_code": "travel",
+                    "scene_label": "差旅票据",
+                    "summary": "铁路电子客票 2026-02-20 武汉-上海 二等座 票价 354 元",
+                    "text": "铁路电子客票 2026-02-20 武汉-上海 二等座 票价 ￥354.00",
+                    "avg_score": 0.95,
+                    "document_fields": [
+                        {"key": "amount", "label": "票价", "value": "354"},
+                        {"key": "route", "label": "行程", "value": "武汉-上海"},
+                        {"key": "date", "label": "日期", "value": "2026-02-20"},
+                    ],
+                    "warnings": [],
+                },
+                {
+                    "filename": "2月23_上海-武汉.pdf",
+                    "document_type": "train_ticket",
+                    "scene_code": "travel",
+                    "scene_label": "差旅票据",
+                    "summary": "铁路电子客票 2026-02-23 上海-武汉 二等座 票价 354 元",
+                    "text": "铁路电子客票 2026-02-23 上海-武汉 二等座 票价 ￥354.00",
+                    "avg_score": 0.95,
+                    "document_fields": [
+                        {"key": "amount", "label": "票价", "value": "354"},
+                        {"key": "route", "label": "行程", "value": "上海-武汉"},
+                        {"key": "date", "label": "日期", "value": "2026-02-23"},
+                    ],
+                    "warnings": [],
+                },
+                {
+                    "filename": "上海酒店发票.pdf",
+                    "document_type": "hotel_invoice",
+                    "summary": "上海酒店 住宿 3 晚 金额 1200 元",
+                    "text": "上海酒店 住宿 3 晚 金额 1200 元",
+                    "avg_score": 0.96,
+                    "document_fields": [
+                        {"key": "amount", "label": "金额", "value": "1200"},
+                        {"key": "merchant", "label": "酒店名称", "value": "上海酒店"},
+                    ],
+                    "warnings": [],
+                },
+            ],
+        }
+        followup_ontology = SemanticOntologyService(db).parse(
+            OntologyParseRequest(
+                query="请把当前上传的票据合并到现有报销草稿中。",
+                user_id="pytest-travel-range@example.com",
+                context_json=followup_context,
+            )
+        )
+        followup_response = UserAgentService(db).respond(
+            UserAgentRequest(
+                run_id=followup_ontology.run_id,
+                user_id="pytest-travel-range@example.com",
+                message="请把当前上传的票据合并到现有报销草稿中。",
+                ontology=followup_ontology,
+                context_json=followup_context,
+                tool_payload={"draft_only": True},
+            )
+        )
+
+        assert followup_response.review_payload is not None
+        followup_slots = {item.key: item for item in followup_response.review_payload.slot_cards}
+        assert followup_slots["expense_type"].value == "差旅费"
+        assert followup_slots["expense_type"].normalized_value == "travel"
+        assert followup_slots["time_range"].value == "2026-02-20 至 2026-02-23"
+        assert followup_slots["location"].value == "上海"
+        assert followup_slots["reason"].value == "去上海支撑上海电力服务器部署，出差3天"
+
+
 def test_user_agent_does_not_treat_draft_saved_message_as_precheck_risk_for_transport() -> None:
     session_factory = build_session_factory()
     with session_factory() as db:
@@ -1384,6 +1549,7 @@ def test_user_agent_review_payload_does_not_fill_hotel_name_from_train_ticket()
             for field in card.fields
         ]
         assert "商户/酒店" not in field_labels
+        assert "列车出发时间" in field_labels
 
 
 def test_user_agent_review_payload_allows_next_step_when_only_optional_ride_receipt_is_missing() -> None: