The poll capped at 32s but slskd results trickle in over ~50s (the music side waits
the whole search_timeout), so slow searches like 'Project Hail Mary' returned 'none'
before results landed. Now:
- /search/start returns poll_ms (slskd search_timeout + 8s); the UI polls that long
(capped 80s), streaming results as they arrive, stopping early only once results
clearly plateau (≥20s + stable) or hit 25.
- /search/poll returns total_files; when 0 video releases but slskd DID return files,
the panel says 'returned N files, but none are video — likely audio/other for this
title' instead of a blank 'none' (Soulseek is audio-heavy; many movie titles are
audiobooks there). slskd_search.poll_search() returns {hits, total_files}.
Tests green, ruff + balance clean.
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