TG_LIMIT = 4096


def chunk_text(text: str, max_length: int = TG_LIMIT) -> list[str]:
    """Split text into ≤max_length chunks, preferring newline then space boundaries."""
    if len(text) <= max_length:
        return [text]

    chunks: list[str] = []
    while text:
        if len(text) <= max_length:
            chunks.append(text)
            break

        split_at = text.rfind('\n', 0, max_length)
        if split_at == -1:
            split_at = text.rfind(' ', 0, max_length)
        if split_at == -1:
            split_at = max_length

        chunk = text[:split_at].strip()
        if chunk:
            chunks.append(chunk)
        text = text[split_at:].strip()

    return chunks