feat: enhance chat history loading with new hooks and UI components (#2338)

* Refactor API fetch calls to use a unified fetch function; enhance chat history loading with new hooks and UI components

- Replaced `fetchWithAuth` with a generic `fetch` function across various API modules for consistency.
- Updated `useThreadStream` and `useThreadHistory` hooks to manage chat history loading, including loading states and pagination.
- Introduced `LoadMoreHistoryIndicator` component for better user experience when loading more chat history.
- Enhanced message handling in `MessageList` to accommodate new loading states and history management.
- Added support for run messages in the thread context, improving the overall message handling logic.
- Updated translations for loading indicators in English and Chinese.

* Fix test assertions for run ordering in RunManager tests

- Updated assertions in `test_list_by_thread` to reflect correct ordering of runs.
- Modified `test_list_by_thread_is_stable_when_timestamps_tie` to ensure stable ordering when timestamps are tied.

backend/packages/harness/deerflow/agents/middlewares/summarization_middleware.py

@@ -5,11 +5,11 @@ from __future__ import annotations
 import logging
 from collections.abc import Collection
 from dataclasses import dataclass
-from typing import Any, Protocol, runtime_checkable
+from typing import Any, Protocol, override, runtime_checkable
 
 from langchain.agents import AgentState
 from langchain.agents.middleware import SummarizationMiddleware
-from langchain_core.messages import AIMessage, AnyMessage, RemoveMessage, ToolMessage
+from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, RemoveMessage, ToolMessage
 from langgraph.config import get_config
 from langgraph.graph.message import REMOVE_ALL_MESSAGES
 from langgraph.runtime import Runtime
@@ -173,6 +173,13 @@ class DeerFlowSummarizationMiddleware(SummarizationMiddleware):
             ]
         }
 
+    @override
+    def _build_new_messages(self, summary: str) -> list[HumanMessage]:
+        """Override the base implementation to let the human message with the special name 'summary'.
+        And this message will be ignored to display in the frontend, but still can be used as context for the model.
+        """
+        return [HumanMessage(content=f"Here is a summary of the conversation to date:\n\n{summary}", name="summary")]
+
     def _partition_with_skill_rescue(
         self,
         messages: list[AnyMessage],