Fix launch 0x8BADF00D and Downloads ghost rows

[sanylax0]

Summary

• Device crash logs on sp17 show repeated 0x8BADF00D scene-create kills inside resumePreparation → enqueue (SwiftData notify / SQLite checkpoint). Suspend per-row sortJobs during bulk resume/import and delay resume ~300ms after restore so scene-create can finish.
• Deleting a track during backoff left a forever-“Waiting” Downloads row. handleTracksDeleted clears jobs/priority/retry state, cancels limiter waiters without granting a slot, and is wired from UI + sync deletes.
• Sort Downloads by phase first (active downloads above prioritized waiting), matching real limiter behavior.

Test plan

• Built + installed on physical iPhone Air (sp17); process stayed alive after cold launch
• Cold launch with a large unfinished import: no 0x8BADF00D kill within ~15s
• Delete a downloading/waiting track: row disappears from Downloads immediately
• Import a large playlist: UI stays responsive while jobs appear

Made with Cursor