Follow-up to the modal fix: the sidebar Service Status + dashboard service card
also mislabeled "Spotify (no auth)" as plain "Spotify". They read the status
`source`, which came straight from metadata.fallback_source ('spotify') with no
awareness of the metadata.spotify_free flag.
- get_primary_source_status now reports a DISPLAY source of 'spotify_free' when
fallback_source='spotify' + metadata.spotify_free is set (the raw 'spotify' is
still used for the auth/connected checks), and treats the free path's
availability as "connected" so the dot isn't falsely red on a no-auth setup.
- getMetadataSourceLabel maps 'spotify_free' → "Spotify (no auth)"; the status
presentation treats spotify_free as part of the Spotify family (session /
rate-limit / cooldown display still work). Added a SOURCE_LABELS entry.
- testDashboardConnection normalizes spotify_free → spotify (the only logic
consumer of the source value — the dashboard Test button).
Routing is unchanged (the real source stays 'spotify' + free flag); this is
purely the display layer. Settings was always correct. 64 integrity tests pass;
the 2 failing soundcloud tests are pre-existing (confirmed identical on a clean
tree).
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