[Part 1 of 3] refactor: add cgm lifecycle progress and support new alerting system

[ETolboom]

Replaces the plugin's legacy UNUserNotificationCenter-based alerting (NotificationHelper, glucose schedules, snooze/critical-alarm UI) with LoopKit's native Alert framework, and adds CGMManagerUI sensor lifecycle surfaces (expiring/signal-loss/failed/unactivated), mirroring SyaiKit's and LibreLoop's alerting pattern. Glucose-threshold alerting is now owned by the app, not the plugin.

Part 1 of 3 related PRs (independent of the other two, but they build on top of this one in my fork):

1. This PR
2. [Part 2 of 3] fix: disable redundant glucose smoothing #43 — fix: disable redundant glucose smoothing
3. [Part 3 of 3] refactor: rework CGM settings screen and persist sensor state across launches #44 — feat/settings view rework

[Copilot]

Pull request overview

This PR refactors LibreTransmitter’s user-facing alerting away from the legacy UNUserNotificationCenter/custom glucose-schedule system and toward LoopKit’s native Alert framework, while also adding CGM lifecycle UI surfaces (CGMManagerUI) for sensor status (warmup/expiring/signal-loss/failed/unactivated).

Changes:

• Replaced legacy notification helper + glucose-schedule/snooze/critical-alarm UI with LoopKit Alert issuance/retraction for lifecycle conditions.
• Added LibreSensorLifecycle model and surfaced lifecycle status via cgmStatusHighlight, cgmStatusBadge, and cgmLifecycleProgress.
• Removed now-obsolete settings screens and persistence types related to glucose-threshold alerting/notification toggles.

Reviewed changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
LibreTransmitterUI/Views/Setup/Libre2DirectSetup.swift	Removes calibration/setup completion local notifications.
LibreTransmitterUI/Views/Setup/BluetoothSelection.swift	Stops requesting notification permissions during BT selection.
LibreTransmitterUI/Views/Settings/SnoozeView.swift	Removed legacy snooze UI for glucose schedule alarms.
LibreTransmitterUI/Views/Settings/SettingsView.swift	Removes alarm/notification-related settings navigation and state.
LibreTransmitterUI/Views/Settings/NotificationSettingsView.swift	Removed legacy notification toggles UI.
LibreTransmitterUI/Views/Settings/AlarmSettings/CustomDataPickerView.swift	Removed legacy alarm schedule time picker UI.
LibreTransmitterUI/Views/Settings/AlarmSettings/CriticalAlarmsVolumeView.swift	Removed critical alarm volume UI tied to legacy notifications.
LibreTransmitterUI/Views/Settings/AlarmSettings/AlarmSettingsView.swift	Removed legacy glucose-threshold alarm schedule editor.
LibreTransmitterUI/LibreTransmitterManager+UI.swift	Adds LoopKit CGM lifecycle progress/highlight/badge based on sensorLifecycle.
LibreTransmitter/Observables/AlarmStatus.swift	Removed observable state used by legacy schedule alarms UI.
LibreTransmitter/NotificationHelperOverride.swift	Removed legacy critical-alert override toggle file.
LibreTransmitter/NotificationHelper.swift	Removed legacy UNNotification-based alerting implementation.
LibreTransmitter/LibreTransmitterManagerV3.swift	Adds lifecycle-tracking state and uses it for status + alert evaluation.
LibreTransmitter/LibreTransmitterManager+Transmitters.swift	Stops issuing legacy notifications; records lifecycle faults/state instead.
LibreTransmitter/LibreTransmitterManager+Libre2EU.swift	Removes legacy “sensor expiring” notification path for Libre2 BLE.
LibreTransmitter/Alerting/LibreTransmitterManagerV3+Alerts.swift	New: issues/retracts LoopKit Alerts based on lifecycle condition diffs.
LibreTransmitter/Alerting/LibreSensorLifecycle.swift	New: unified lifecycle computation across classic and Libre2 direct-BLE paths.
LibreTransmitter/Alerting/LibreAlertCondition.swift	New: maps lifecycle conditions to LoopKit Alert content + severity.
LibreTransmitter/.gitignore	Removes ignore rule for deleted NotificationHelperOverride file.
LibreTransmitter.xcodeproj/project.pbxproj	Removes legacy sources; adds new alerting/lifecycle sources/groups.
Features.swift	Removes legacy vibration feature flag tied to glucose alarms.
Common/Settings/UserDefaults+Bluetooth.swift	Adds dangerModeActivated persistence (migrated from removed alarm settings file).
Common/Settings/UserDefaults+Alarmsettings.swift	Removed legacy alarm/notification/glucose-schedule defaults storage.
Common/Settings/GlucoseSchedules.swift	Removed legacy glucose schedule + snooze model.
build.md	Removes build steps related to legacy vibration/critical-alerts notifications.
.gitignore	Removes ignore rule for deleted NotificationHelperOverride file.

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[dabear]

Thanks for the contribution. However, please rebase on top of the next-dev branch and submit a new PR against that branch directly, or much of the code refactors there would get merge conflicts

[dabear]

Also, smaller PRs are much welcome, makes them easier to review and test locally. Ideally I test everything individually for a week locally before merging, even applies to my own commits. Would be great to have lifecycle progress in a separate PR for example

[ETolboom]

Hi dabear,

Thanks for taking a look. Ill make sure to create a new PR rebased on your work in dev-next. Looking at the branch I think we indeed have quite some overlap so I'll try to base it on your changes.

As for your second comment: I will split this current PR to make it more manageable.