Function _is_non_fast_forward_push

deployments/desktop/shared/agents.py:1447–1449

(output: str)

            (
                "GitHub sync needs remote changes, but automatic rebase conflicted. "
                f"Resolve the reading-notes repo manually, then sync again: {rebase_output}"
            )
            if language == "en"
            else (
                "GitHub 同步需要合并远端新提交，但自动 rebase 发生冲突。"
                f"请手动处理阅读笔记仓库冲突后再同步：{rebase_output}"