Step 2 of the redownload modal now streams results as each download
source responds instead of waiting for all sources to finish. Tidal/
YouTube/Qobuz columns appear instantly while Soulseek searches.
Backend: search-sources endpoint uses ThreadPoolExecutor + NDJSON
streaming — one JSON line per source as it completes.
Frontend: reads the NDJSON stream, appends columns with fade-in
animation as each source responds. Download button enables as soon
as any results arrive.
Each source gets its own column with results grouped and sorted by
confidence. Visual confidence bars, format badges, and source-specific
metadata (Soulseek username/slots). Best overall match auto-selected.
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