refactor(rsc): narrow client module boundaries

src/lib/auth/auth_session.ts

@@ -1,5 +1,3 @@
-"use client";
-
 import { AuthStorage } from "@/data/storage/auth/auth_storage";
 import type { IAuthStorage } from "@/data/storage/auth";
 

src/lib/chat/splash_latest_message.ts

@@ -1,5 +1,3 @@
-"use client";
-
 import { getChatRepository } from "@/data/repositories/chat_repository";
 import {
   resolveChatCacheOwnerKey,