Matches the Search page redesign so both surfaces behave identically.
The sidebar popover previously always fan-out-fetched all sources on
every keystroke (via _gsFetchSourceStream streaming NDJSON for every
alternate) and exposed a post-search tab bar to switch views.
Now:
- The popover renders an always-visible source icon row at the top, one
icon per source (Spotify, iTunes, Deezer, Discogs, Hydrabase,
MusicBrainz, Music Videos, Soulseek).
- Typing fetches only the currently-selected source. No fan-out.
- Clicking a different icon: cache hit -> instant re-render; cache miss
-> single-source fetch + render.
- Per-query cache cleared on query change; cache dots on icons show
which sources already have results for the current query.
- Default active source read from /api/settings (metadata.fallback_source)
on first focus; falls back to Spotify.
- Fallback banner shown when the backend served a different source than
the one clicked (rate-limit auto-fallback).
- Soulseek icon click navigates to /search with the query pre-filled,
since the raw file list doesn't fit the popover. The Search page
takes over rendering from there.
Gone: _gsFetchSourceStream (fan-out), _gsRenderTabs, _gsSwitchSource,
_gsState.altAbortCtrl, per-section _loading sets.
Added: _gsInitDefaultSource, _gsFetchSource, _gsFetchYouTubeVideos,
_gsSourceRowHtml, _gsFallbackBannerHtml, _gsSetActiveSource,
_gsNavigateToSearchPage.
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