- fetch() uses a retrying session (connection resets, 5xx, 429 Retry-After)
with backoff, so a transient drop mid-fetch no longer aborts the run.
- tqdm progress bars on all paginated fetches (driven by paging `total`).
- Flow.fetch_spotify(): drop stray `self` from the @staticmethod.
- gui.sh runs the venv's streamlit from the script dir; add requirements.txt.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
