feat: 添加会话列表和搜索功能，重构聊天界面组件

features/im/hooks/use-conversation-search.ts

@@ -0,0 +1,19 @@
+import { useMemo } from "react";
+
+import type { ConversationItem } from "@/features/im/types/conversation";
+
+export function useConversationSearch(items: ConversationItem[], keyword: string) {
+  return useMemo(() => {
+    const query = keyword.trim().toLowerCase();
+    if (!query) {
+      return items;
+    }
+
+    return items.filter((item) => {
+      return (
+        item.title.toLowerCase().includes(query) ||
+        item.preview.toLowerCase().includes(query)
+      );
+    });
+  }, [items, keyword]);
+}