feat(tiles): Quick Settings tiles for the next alarm and a quick timer

"Next alarm" reads the next-alarm widget's model and shows the weekday
and time of the next alarm, or "No alarms"; a tap opens the Alarms tab,
behind an unlock on a locked device, through the PendingIntent overload
of startActivityAndCollapse on API 34+.

"Quick timer" is the quick-timer widget's twin: at rest it shows its
duration and a tap starts a transient timer through the timer engine;
while that timer is active the tile is on, shows when it ends (or that
it is paused or done), and a tap resets it. It works on a locked device,
as the timer notification does. Its duration is a new backed-up setting,
chosen by long-pressing the tile, with the widget's bounds and picker.

Both are active tiles, redrawn by TileSync when the state they mirror
changes rather than bound on every panel open. No new permission.

Fixes #26

docs/ARCHITECTURE.md

@@ -99,9 +99,10 @@ kit module: the kit's roadmap keeps schedulers app-local.
 | `domain/backup/` | `BackupContent` (M10): the plain Kotlin model between `data/backup`'s JSON codec and the repository/engine; decoupled from the wire DTOs the same way the data layer is decoupled from Room |
 | `domain/selfcheck/` | `SelfCheck` (M10): the "why might my alarm not ring?" rule table: pure functions over a `DeviceState` snapshot, each producing a `CheckResult` with a status and an optional deep-link `SelfCheckFix` |
 | `domain/widget/` | the three widget presenters (M10), `NextAlarmWidgetModel`/`TimerWidgetModel`/`ClockWidgetModel`: selection and formatting only, so a widget's content is unit-tested without Glance |
+| `domain/tile/` | `QuickTimerTileModel`/`QuickTimerTilePresenter` (#26): what the quick-timer Quick Settings tile shows and what a tap does, over the quick-timer widget's own selection. The next-alarm tile needs no presenter of its own; it reads `NextAlarmWidgetModel` |
 | `data/db/` | `ClockulaDatabase` (`@Database` v3, `exportSchema = true`) and `Migrations` |
 | `data/alarms/` | the alarm and ring-state entities, DAOs, mappers and repositories |
-| `data/timers/` | `TimerEntity`, `TimerDao`, `TimerMapper`, `TimerRepository(+Impl)`, `TimerRingStateStore` (the ring session's one DataStore record) |
+| `data/timers/` | `TimerEntity`, `TimerDao`, `TimerMapper`, `TimerRepository(+Impl)`, `TimerRingStateStore` (the ring session's one DataStore record), `QuickTileStateStore` (which timer the quick-timer tile started, #26) |
 | `data/worldclocks/` | `WorldClockEntity`, `WorldClockDao`, `WorldClockMapper`, `WorldClockRepository(+Impl)`, unchanged since M2; M8 is the milestone that finally calls all of it |
 | `data/zones/` | the ICU seam (M8): `ZoneNames`, `IcuZoneNames` (the only `android.icu` file in the app) and `ZoneDirectory`, the locale-keyed catalog cache and the DST-keyed display-name memo |
 | `data/stopwatch/` | `LapEntity`, `LapDao` (one `COUNT(*)` added in M7), `LapMapper`, `StopwatchStateStore`, `StopwatchRepository(+Impl)` |
@@ -116,7 +117,7 @@ kit module: the kit's roadmap keeps schedulers app-local.
 | `alarm/ring/` | the alarm's ringing foreground service and its notifications. Its audio player and vibrator moved to `ring/` in M6, shared with the timer's ring |
 | `alarm/di/` | `AlarmModule`: `@Binds` for the four seams |
 | `ring/` | `RingAudioPlayer` and `RingVibrator`: one `MediaPlayer` wrapper and one vibrator for both ring paths. A build rule fails on a second one |
-| `timer/` | `TimerEngine` and the three seams it talks to (`TimerScheduler`, `TimerServiceHandle`, `AlarmRingStatus` + `AlarmStateRingStatus`), plus `TimerIntents` |
+| `timer/` | `TimerEngine` and the three seams it talks to (`TimerScheduler`, `TimerServiceHandle`, `AlarmRingStatus` + `AlarmStateRingStatus`), plus `TimerIntents`, and `QuickTileTimer` (#26), the quick-timer tile's model and tap, through the engine and with no Android type |
 | `timer/android/` | the seams' Android implementations: the one elapsed-realtime AlarmManager slot, the service handle |
 | `timer/receiver/` | `TimerExpiryReceiver` (the slot arriving), `TimerActionReceiver` (the notification's buttons) |
 | `timer/service/` | `TimerService` (one foreground service for the countdown and the ring) and `TimerNotifications` |
@@ -130,6 +131,8 @@ kit module: the kit's roadmap keeps schedulers app-local.
 | `system/` | `RebootRepair`, the boot-id gate |
 | `backup/` | `BackupEngine` (M10), the orchestrator (a ringing alarm dismissed and running timers deleted before a replace, `AlarmEngine.reschedule()`/`TimerEngine.resync()` after it), plus `BackupFiles`, the SAF seam, with its Android implementation in `backup/android/` |
 | `widget/` | the three `GlanceAppWidget`/`GlanceAppWidgetReceiver` pairs (M10) and `WidgetSync`, the event-driven collector (started from `ClockulaApp.onCreate`) that redraws all three on any change to the state they mirror. `widget/di/` holds the `@EntryPoint` Glance needs, since a `GlanceAppWidgetReceiver` is never `@AndroidEntryPoint`-constructed |
+| `tile/` | the two Quick Settings tiles (#26): `NextAlarmTileService` and `QuickTimerTileService`, which only render and forward a click, `TileKit` (opening the app, behind an unlock on a locked device, through the `PendingIntent` overload on API 34+), and `TileSync`, `WidgetSync`'s counterpart: both are *active* tiles, redrawn only when this asks the system to, never on every panel open |
+| `ui/tile/` | `TilePreferencesActivity` (#26), what long-pressing a tile opens: the quick-timer tile's duration, through the quick-timer widget's own picker |
 | `ui/theme/`, `ui/crash/` | the M0/M1 theme and the crash-report surface |
 | `ui/shell/` | the navigation policy (`ShellNavigation`), the adaptive shell, the live pill and its source/ViewModel, the notification-permission ask. `EmptyTabScreen` is gone: its KDoc said it existed only until each of M5–M8 replaced its own tab, and the world clock was its last caller |
 | `ui/common/` | `rememberLocalTimeFormatter`, the app's one 12/24-hour formatter, over a `java.time.LocalTime`, with `rememberAlarmTimeFormatter` delegating to it (M8 D17); and, since M6, the ringtone picker (`RingtonePickerState`, `RingtonePickerScreen`), which both editors need |
@@ -599,6 +602,7 @@ Four slices:
 | Stopwatch run record (M2) | `stopwatch_state`, `stopwatch_started_elapsed_millis`, `stopwatch_accumulated_millis`, `stopwatch_last_lap_cumulative_millis` (M7 is the first caller of the last, for the in-progress lap's split) | `StopwatchPrefs`, behind `StopwatchStateStore` |
 | System facts (M3) | `last_boot_id` | `SystemPrefs`, behind `BootStateStore`, the persisted half of the reboot gate |
 | Timers (M6) | `timer_presets`, `timer_ring_sounding_since_millis` | `TimerPrefs`: the presets surfaced as `SettingsPrefs.timerPresets`, the ring session's anchor behind `TimerRingStateStore` |
+| Quick-timer tile (#26) | `quick_tile_duration_millis`, `quick_tile_timer_id` | `TimerPrefs`: the duration (a backed-up setting) surfaced as `SettingsPrefs.quickTileDuration`, the transient timer the tile started (volatile, not backed up) behind `QuickTileStateStore` |
 
 The stopwatch's *run* is a single record, so it lives in DataStore rather than
 as a one-row table (`PLAN.md` §5); its *laps* are a list, so they live in Room.