notifications: add sleep-aware Quiet Time

[TheCodedKid]

What

Addresses request feature found here: #1804

How

• add opt-in Sleep Aware Quiet Time during light and restful sleep
• add an Until Wake mode that starts immediately and ends after sleep followed by waking
• preserve manual, scheduled, calendar-aware, and sleep-aware activation as independent sources
• expose both modes in Quiet Time settings and explain when Health Tracking is required

Sleep Aware is persisted and synchronized with notification preferences. Manually ending it during sleep overrides it only for the current sleep timeframe.

Until Wake stores whether sleep has been observed, survives restarts and temporary tracking interruptions, and does not clear unrelated Quiet Time sources when waking.

Testing

• nix develop -c ./pbl test -M '.*services/activity/test_activity[.]c' --show_output --no_images (24 tests pass)
• nix develop -c ./pbl test -M '.*services/test_do_not_disturb[.]c' --show_output --no_images (17 tests pass)
• QEMU Gabbro firmware build
• visually verified Sleep Aware, Until Wake, and the Health Tracking requirement dialog
• gitlint across all four commits

AI usage

Developed with assistance from GPT-5.6 Sol and manually reviewed.

Sorry about bulk at the end, alot of test cases

[Copilot]

Pull request overview

This PR adds new Quiet Time (Do Not Disturb) activation modes that integrate with Activity sleep detection, allowing Quiet Time to be enabled automatically during sleep (“Sleep Aware”) or enabled immediately until sleep is observed and the user wakes (“Until Wake”). It extends the firmware’s DND service, preference persistence/sync, event propagation, settings UI, and unit tests to support these modes while keeping other DND sources (manual/scheduled/calendar-aware) independent.

Changes:

• Add Sleep Aware DND and Until Wake DND modes to the DND service, including persistence of state and activity-event handling.
• Wire sleep state changes into the system event loop and emit a new activity event on sleep state transitions.
• Expose both modes in Quiet Time settings UI and expand unit tests to cover the new behaviors.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/fw/services/test_do_not_disturb.c	Adds unit tests and fakes for sleep-aware and until-wake DND behavior and preference persistence.
tests/fw/services/activity/test_activity.c	Extends health/activity tests to assert sleep-state-change activity events are emitted.
src/fw/shell/normal/shell_event_loop.c	Dispatches activity events to the DND service so it can react to sleep/tracking changes.
src/fw/services/notifications/do_not_disturb.c	Implements sleep-aware and until-wake logic, activity event handling, and new override/persistence behavior.
src/fw/services/notifications/do_not_disturb_toggle.c	Ensures the manual DND action toggle disables Until Wake when ending Quiet Time.
src/fw/services/notifications/alerts_preferences.c	Persists new DND preferences (sleep-enabled and until-wake state) and reloads sleep-enabled on settings sync.
src/fw/services/blob_db/settings_blob_db.c	Adds dndSleepEnabled to the list of syncable notification preferences.
src/fw/services/activity/activity_sessions.c	Emits a new activity event when sleep state changes.
src/fw/kernel/events.h	Adds PebbleActivityEvent_SleepStateChanged and a sleep_state field to PebbleActivityEvent.
src/fw/apps/system/settings/quiet_time.c	Adds UI entries/toggles for Sleep Aware and Until Wake, including health-tracking gating.
include/pbl/services/notifications/do_not_disturb.h	Exposes new DND APIs and activity event handler declaration.
include/pbl/services/notifications/alerts_preferences_private.h	Adds private preference APIs and DndUntilWakeState enum for Until Wake persistence.

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