The queue/scheduler lived only in renderer memory, so saved/scheduled and other
pending downloads were silently lost on quit (audit M4). Persist them:
- main: queue.ts store (proven cached-atomic createJsonStore, queue.json) +
queue:list / queue:save IPC; QUEUE_MAX cap.
- shared: PersistedQueueItem = the durable subset of DownloadItem (runtime-only
progress/speed/eta/sizeLabel/finishing dropped).
- renderer: mirror the persistable items on every queue change (a signature over
the subset means progress ticks don't re-save; main's jsonStore coalesces the
writes) and rehydrate on launch via an App useEffect. Pure mappers extracted
to store/queuePersist.ts and unit-tested.
Restore semantics: downloading -> queued (yt-dlp continues the .part), saved +
scheduledFor survives so the promoter fires when due, paused/error return
actionable; completed/canceled are never persisted. A queueHydrated gate stops a
launch-time store change from wiping queue.json before it's read.
Reconciles ROADMAP.md. typecheck + 268 tests + eslint + prettier green.
(OS-level quit/relaunch cycle is worth a manual smoke test.)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
debont80
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