Fix: inject HF_TOKEN secret for dataset writes + fix cache path separators

Add floating toast: 'Scroll down to see the snapshot' on commit select

Update SDK version to 5.29.1

Fix: upgrade gradio to v5+ for Python 3.13 compatibility (audioop removed)

Add deduplication: SHA-based deterministic bucket assignment + index + pre-write check

Add requirements.txt

Add README.md

Add app.py

initial commit