BGAppRefreshTask audio recovery; LA expiry notification; code quality

[MtlPhil]

Summary

BGAppRefreshTask — automatic silent audio recovery

• BackgroundRefreshManager.swift (new): singleton that registers a BGAppRefreshTask handler (com.loopfollow.audiorefresh). When iOS wakes the app, it checks whether the silent audio player is still alive and restarts it if not, then reschedules itself for 15 minutes later.
• Info.plist: added com.loopfollow.audiorefresh to BGTaskSchedulerPermittedIdentifiers; added fetch to UIBackgroundModes (required for BGTaskScheduler.submit to succeed).
• AppDelegate: calls BackgroundRefreshManager.shared.register() before return true in didFinishLaunchingWithOptions.
• MainViewController: calls BackgroundRefreshManager.shared.scheduleRefresh() after backgroundTask.startBackgroundTask().
• BackgroundTaskAudio: fixed idempotency — startBackgroundTask() now removes the interruption observer before re-adding it, preventing duplicate callbacks when audio restarts.
• BGAppRefreshTask double setTaskCompleted race fixed: the expiration handler and the DispatchQueue.main.async block are now guarded by a shared completed flag — whichever runs first wins; the second is a no-op. Apple documents calling setTaskCompleted more than once as a programming error.

This adds a third recovery layer alongside the existing AVAudioSession interruption handler and BackgroundAlertManager watchdog notifications.

Extended data slots — all configurable metrics now populated

StorageCurrentGlucoseStateProvider previously only exposed core glucose, IOB, and COB. It now implements the full CurrentGlucoseStateProviding protocol, sourcing all 20+ extended metrics from Storage.shared and Observable.shared:

Metric	Source
Override name	Observable.shared.override
Recommended bolus	Observable.shared.deviceRecBolus
CGM/uploader battery	Observable.shared.deviceBatteryLevel
Pump battery	Observable.shared.pumpBatteryLevel
Basal rate	Storage.shared.lastBasal
Pump reservoir	Storage.shared.lastPumpReservoirU
Autosensitivity	Storage.shared.lastAutosens
TDD	Storage.shared.lastTdd
BG target low/high	Storage.shared.lastTargetLowMgdl/High
ISF	Storage.shared.lastIsfMgdlPerU
Carb ratio	Storage.shared.lastCarbRatio
Carbs today	Storage.shared.lastCarbsToday
Profile name	Storage.shared.lastProfileName
SAGE / CAGE / IAGE	Storage.shared.sageInsertTime / cageInsertTime / iageInsertTime
Min/max predicted BG	Storage.shared.lastMinBgMgdl/MaxBgMgdl
isNotLooping	Observable.shared.isNotLooping
showRenewalOverlay	computed from laRenewBy vs renewalWarning

This means all 22 configurable Live Activity slots (IOB, COB, basal, pump, target, ISF, CR, SAGE/CAGE/IAGE, etc.) now display live data rather than "—".

Live Activity expiry notification + dismissed-by-user distinction

• LiveActivityManager: on first renewal failure, schedules a local notification ("Live Activity Expiring — Open LoopFollow to restart"). Notification is cancelled on successful renewal or forceRestart().
• attachStateObserver: on .dismissed, checks laRenewalFailed to distinguish iOS force-dismissing after the 8-hour limit (auto-restart allowed) from the user manually swiping away (auto-restart blocked until explicit restart via button or App Intent).
• Renewal deadline write ordering fixed: laRenewBy is now written to Storage only after Activity.request() succeeds, eliminating the narrow window where a crash between the write and the request could leave the deadline permanently stuck in the future. No rollback needed on failure.

GlucoseSnapshot.withRenewalOverlay(_:) helper

Replaces the manual field-by-field copy in renewIfNeeded with a single method call.

startIfNeeded seed snapshot improvement

On LA start, now attempts GlucoseSnapshotBuilder.build() first (all extended fields populated), falls back to the persisted store, then to the zero seed.

Dead code removal

• SceneDelegate: removed pendingLATapNavigation flag — it was never set to true.
• LoopFollowLiveActivity: removed commented-out /* let activityID: String */ property.
• LiveActivitySlotConfig.swift: deleted (already removed upstream; resolved here).

Log category fixes

• BackgroundRefreshManager: all logs → .taskScheduler
• AppDelegate + APNSClient: APNs-related logs → .apns

Bug fix

• DeviceStatusLoop: Int(prediction.last!) → Int(round(prediction.last!)) — prevents truncation toward zero on prediction display values.

SwiftFormat pass

Applied SwiftFormat (Swift 6.2) across all changed files.

Test plan

• Build succeeds for both LoopFollow and LoopFollowLAExtension targets
• Silent audio keep-alive still works in background
• BGAppRefreshTask fires and restarts audio when dead (test on device: background app, wait 15+ min)
• BGAppRefreshTask expiration path completes without crash
• All configurable LA slots display live data (IOB, COB, basal, pump, SAGE, etc.)
• LA renewal failure triggers local notification
• Swiping away LA blocks auto-restart; Restart button re-enables it
• iOS-expired LA (after 8 h) allows auto-restart on next foreground
• LA renewal still works at the 7.5-hour mark; deadline is written correctly on success

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