fix(chats): prevent duplicate saved messages entries in chat list

app/chats/repository.py

@@ -60,7 +60,11 @@ def _user_chats_query(user_id: int, query: str | None = None) -> Select[tuple[Ch
             ChatUserSetting,
             (ChatUserSetting.chat_id == Chat.id) & (ChatUserSetting.user_id == user_id),
         )
-        .where(ChatMember.user_id == user_id, func.coalesce(ChatUserSetting.archived, False).is_(False))
+        .where(
+            ChatMember.user_id == user_id,
+            func.coalesce(ChatUserSetting.archived, False).is_(False),
+            Chat.is_saved.is_(False),
+        )
     )
     if query and query.strip():
         q = f"%{query.strip()}%"
@@ -162,6 +166,7 @@ async def find_saved_chat_for_user(db: AsyncSession, *, user_id: int) -> Chat |
         select(Chat)
         .join(ChatMember, ChatMember.chat_id == Chat.id)
         .where(ChatMember.user_id == user_id, Chat.is_saved.is_(True))
+        .order_by(Chat.id.asc())
         .limit(1)
     )
     result = await db.execute(stmt)