feat(queue): backend queue state machine replacing frontend shuffle, navigation, and play-next logic#42
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…navigation, and play-next logic Move ~500 lines of queue state machine from JS frontend to Rust backend. Frontend queue store becomes a thin reactive layer calling backend commands and applying returned state snapshots. Backend: - Extend queue_state table with play_next_offset, play_history_json, play_next_track_ids_json, repeat_one_pending columns - Add toggle_shuffle (Fisher-Yates with play-next pinning), add_play_next (move semantics + offset tracking), advance_to_next/previous (repeat-one two-phase, loop modes, history), skip_to_next/previous (override repeat-one), check_integrity - Register 6 new Tauri commands, enhance queue_set_shuffle to return QueueStateSnapshot - 773 Rust tests pass Frontend: - Remove _shuffleItems, _reshuffleForLoopRestart, _originalOrder, _playHistory, _playNextTrackIds, _playNextOffset, _repeatOnePending, _syncQueueToBackend, _validateQueueIntegrity - Add _applySnapshot and _applyNavigationResult - Update queue-builder and queue.props tests for backend-delegated pattern - 444 Vitest tests pass Closes TASK-328 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Remove unnecessary async from _applyNavigationResult (no await inside). Prefix unused fromNavigation parameter with underscore. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
toggleShuffle now sets this.shuffle before the backend call (like cycleLoop does for loop mode), reverting on failure. Add aria-pressed to the shuffle button so the E2E accessibility test detects state change. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
queue_add_play_next,queue_play_next_track,queue_play_previous_track,queue_skip_next,queue_skip_previous,queue_check_integrityqueue_stateDB table withplay_next_offset,play_history_json,play_next_track_ids_json,repeat_one_pendingcolumnsTest plan
cargo nextest run -p mt-tauri— 773 tests passnpx vitest run— 444 tests passCloses TASK-328
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