auth/store.svelte.ts no longer imports from $lib/player. Logout
broadcasts via auth/sessionEnd.svelte.ts (a tiny tick + outgoing
userId pair); player subscribes through $effect.root and owns the
player-specific teardown (clearPersistedQueue + playQueue([]) +
closeQueueDrawer()).
Cycle fully inverted — auth is now a pure leaf for player; future
session-end consumers (download cache, recent-search history) plug
in by adding their own effect on the same signal.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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