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.

frontend/src/core/i18n/locales/en-US.ts

@@ -29,6 +29,7 @@ export const enUS: Translations = {
     close: "Close",
     more: "More",
     search: "Search",
+    loadMore: "Load more",
     download: "Download",
     thinking: "Thinking",
     artifacts: "Artifacts",