fix(frontend): preserve agent context in thread history routes (#1771)

* fix(frontend): preserve agent context in thread history routes

* fix(frontend): preserve agent thread fallback context

* style(frontend): format thread route utils test

---------

Co-authored-by: luoxiao6645 <luoxiao6645@gmail.com>

frontend/src/core/threads/hooks.ts

@@ -528,7 +528,7 @@ export function useThreads(
     limit: 50,
     sortBy: "updated_at",
     sortOrder: "desc",
-    select: ["thread_id", "updated_at", "values"],
+    select: ["thread_id", "updated_at", "values", "context"],
   },
 ) {
   const apiClient = getAPIClient();