android: the real client — backend, notifications, Live Update, Glyph

The app module was a design gallery: tokens, type and a dial, with no backend,
no notification and nothing driving the rear matrix. This is the rest of it.

**One engine, three views.** `TimerEngine` lives on the Application, not in a
ViewModel, because the Compose screen, the foreground service's notification
and the Glyph must show the *same* second. Two engines polling the same backend
drift apart within seconds and the user sees a notification disagreeing with
the dial. It polls, ticks from a monotonic anchor, and puts every reply through
`:core`'s `reconcile`.

`pomodoro.state()` does not finish an interval whose time is up — it reports
`remaining_seconds = 0` and waits for a client to call `complete`. The tick
loop does, behind the same re-entry guard `desktop/controller.py` uses, since
without one a 1 Hz tick at zero fires `complete` every second until the reply
lands.

**Notifications.** Two channels, because the running interval must be silent
and its *end* must not; one channel cannot be both, and a user who silences a
buzzing countdown has silenced the only part that mattered. The ongoing one is
an Android 16 Live Update: promotion needs `setOngoing` + `setRequestPromotedOngoing`
+ a `ProgressStyle`, and missing any one renders it as an ordinary notification
with no error and no log. Its segments come from `:core`'s `dialTickCount`, so
the status bar, the dial and the Glyph ring agree on what one tick is worth.

**Glyph.** `GlyphMatrixManager.init()` binds `com.nothing.thirdparty/.GlyphService`
and *discards* the boolean `bindService` returns — so on Android 11+ a missing
`<queries>` entry makes the package invisible, the bind silently fail, and the
matrix stay dark with no exception, no log and `onServiceConnected` never
arriving. That was the whole of "the glyph does not work". The manifest now
declares it and `MatrixGlyphDisplay` checks visibility itself rather than
leaving the next person with the same dead end.

The SDK's licence forbids redistribution (clause 2.1(c)), so the .aar stays
git-ignored and `fetch-glyph-sdk.sh` downloads it. Without it a second source
set compiles a no-op display: the app builds, installs and runs with an inert
rear panel, which is also the correct behaviour on any phone that is not a
Nothing.

Verified on the device (Phone (3), Android 16), debug and release: onboarding
against kadence.timka.su, the Live Update with `shortCriticalText` and a 600s
progress track, the matrix accepting 625-dot frames, tasks opening in the Jira
app, and R8 leaving the DTOs decodable. 225 tests, none needing a device.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

android/gradle/libs.versions.toml

@@ -17,6 +17,10 @@ robolectric = "4.14.1"
 serialization = "1.11.0"
 okhttp = "5.5.0"
 junit = "4.13.2"
+# 1.19.1 is what carries NotificationCompat.ProgressStyle and
+# setRequestPromotedOngoing — the Android 16 Live Update API, via the compat layer
+# rather than raw platform calls behind SDK_INT checks.
+androidxCore = "1.19.1"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
@@ -41,6 +45,10 @@ activity-compose = { module = "androidx.activity:activity-compose", version.ref
 navigation-compose = { module = "androidx.navigation:navigation-compose", version.ref = "navigationCompose" }
 lifecycle-viewmodel-compose = { module = "androidx.lifecycle:lifecycle-viewmodel-compose", version.ref = "lifecycle" }
 lifecycle-runtime-compose = { module = "androidx.lifecycle:lifecycle-runtime-compose", version.ref = "lifecycle" }
+lifecycle-service = { module = "androidx.lifecycle:lifecycle-service", version.ref = "lifecycle" }
+
+androidx-core = { module = "androidx.core:core-ktx", version.ref = "androidxCore" }
+coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-android", version.ref = "coroutines" }
 
 [plugins]
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }