The old search did a 4.5s slskd search + 8s wait; slskd responses trickle in over
10-30s, so the window closed before results arrived (you'd see them in slskd but the
panel said none). Now it works like the music side:
- slskd_search.start_search() (uses the shared soulseek.search_timeout) + poll_responses().
- POST /downloads/search/start (mock = immediate; soulseek = returns a search id) +
GET /downloads/search/poll. Shared _evaluate_hits ranks each poll's hits.
- UI streams: starts the search, polls every 1.3s, renders results live with a
'searching…' badge, stops when results plateau (4 stable polls) or ~32s. Live
re-renders suppress per-card entrance so it doesn't blink.
Tests green, ruff clean.
