The Search page previously fired a primary /api/enhanced-search request
plus a fan-out loop (_queueAlternateSourceFetches / _fetchAlternateSource)
that streamed NDJSON from /api/enhanced-search/source/<src> for every
other configured source. One search = 7 API calls across Spotify, iTunes,
Deezer, Discogs, Hydrabase, MusicBrainz, and YouTube Music Videos. The
post-search tab bar then let users switch views between the results that
had already been fetched.
This changes the default to explicit per-source selection:
- The old <select id="search-source-select"> dropdown and the
<div id="enh-source-tabs"> post-search tab bar are replaced by a
single always-visible icon row (#enh-source-row) above the search
bar. One button per source, horizontal-scroll on narrow screens.
- Typing fetches only the currently-selected source. No fan-out.
- Clicking a different icon switches to that source and fetches it
on demand, unless results for this query are already cached.
- Per-query cache (Map keyed by source) is cleared whenever the query
changes; cached icons show a small dot, loading icons show a spinner.
- Soulseek is a first-class icon in the row — selecting it routes to
the existing raw-file basic search, no change to that renderer.
- YouTube Music Videos is its own icon, still uses the NDJSON stream
endpoint for incremental rendering.
- Default active icon reads metadata.fallback_source from /api/settings
on init; falls back to Spotify.
- Rate-limit fallback (backend serves Deezer when Spotify is banned)
surfaces as an amber banner above results plus an amber border on the
clicked icon, so users understand why the returned results don't
match the source they picked.
SOURCE_LABELS in shared-helpers.js gains an 'icon' field per source and
a new SOURCE_ORDER constant for the canonical picker order. The fan-out
functions (_queueAlternateSourceFetches, _fetchAlternateSource,
renderSourceTabs, window._switchEnhSourceTab) are gone.
Backend untouched — POST /api/enhanced-search already supported a
`source` param for single-source mode; we were just never using it by
default. Global widget redesign to match is the next commit.
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