Extracted QueueManager from qbz-nix to qbz-player crate.
Features:
- Queue manipulation (add, remove, reorder, clear)
- Current track tracking
- Shuffle mode with Fisher-Yates algorithm
- Repeat modes (off, all, one)
- Play history for going back
- Full test coverage preserved
Uses types from qbz-models:
- QueueTrack
- QueueState
- RepeatMode
Phase 3b (player module extraction) deferred - requires:
- Trait abstraction for API client
- Trait abstraction for audio backend
- Config system refactoring
vicrodh
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