Add .prettierignore excluding __LOCAL_LLMs/ (and dist/build/generated). Those
are mirrored copies refreshed by the chat-history sync; prettier was rewriting
them on every commit, fighting the generator and producing permanent diff
churn. Also commits the latest refresh snapshot in its native format.
Generated with [Devin](https://cli.devin.ai/docs)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
