Each source in the movie/YouTube download view had one 'Search' button (manual —
you pick a release). Adds a second 'Auto' button beside it that runs the SAME
search and then auto-grabs the best release for your quality profile; renamed the
pair to 'Manual' / 'Auto' for clarity (+ a matching 'Auto all' beside 'Manual all').
How 'best' is chosen: the backend already returns hits ranked best-first
(accepted → score → availability — see test_downloads_search_endpoint_ranks_and_filters),
so Auto just waits for the search to settle, then takes the first accepted hit
that has an uploader and grabs it. The chosen release card gets a ring + the row
shows Auto-grabbing → Sent, so the pick is transparent.
- searchInto/_pollSearch gain an onDone callback (fires when results settle); the
immediate (mock) path fires it too.
- doGrab refactored into shared buildGrabPayload + sendGrab so the manual button
and _autoPick send an identical /grab request (incl. the auto-retry candidate pool).
- searchInto now drops stale _rows on start so an empty Auto search can't grab a
prior search's hit.
Soulseek-grab-only for now (same as the manual button); non-soulseek sources say
'no release met your profile' until that grab path lands. TV show view (separate
onShowClick, still stub searches) untouched. 7 wiring tests; node --check clean.
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