M12e: contract pass (pair invite kind, admin name in invite links, sync failed flag, rejection actor, device version name, template id, update check result, untouched accounts, D-027 re-stamp, PushEvent in :core:model, snackbar hosts)

Server: E-3 invite_kind; E-12 link ?from=<admin name>, E-4 passes it into kvitt://invite;
X-Kvitt-App-Version-Name stored in devices.app_version_name (migration 0003, schema 3);
OpenAPI and examples follow. Phone: :core:model, :core:fakes, :data, features and :app
updated together; goldens re-recorded for S-20 (version name) and new S-1/S-22 states.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B

android/feature/home/src/main/kotlin/se/hagstedt/kvitt/feature/home/SyncStatusScreen.kt

@@ -18,10 +18,12 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.ReadOnlyComposable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -74,13 +76,17 @@ data class SyncStatusActions(
     val onOpenDateSettings: () -> Unit = {},
 )
 
-/** Sync status (S-16): status, "Synka nu", pending changes and the changes that were not synced (AC-15.5). */
+/**
+ * Sync status (S-16): status, "Synka nu", pending changes and the changes that were not synced (AC-15.5).
+ * [snackbarHostState] is hosted in this screen's scaffold (a result snackbar after returning here, D-071).
+ */
 @Composable
 fun SyncStatusScreen(
     onBack: () -> Unit,
     onOpenExpense: (ExpenseId) -> Unit,
     onOpenSettlement: (SettlementId) -> Unit,
     modifier: Modifier = Modifier,
+    snackbarHostState: SnackbarHostState = remember { SnackbarHostState() },
     viewModel: SyncStatusViewModel = hiltViewModel(),
 ) {
     val ui by viewModel.ui.collectAsStateWithLifecycle()
@@ -99,16 +105,17 @@ fun SyncStatusScreen(
             }
         },
     )
-    SyncStatusContent(ui, actions, modifier)
+    SyncStatusContent(ui, actions, modifier, snackbarHostState)
 }
 
 private const val LOG_TAG = "KvittSyncStatus"
 
 /** The stateless sync status screen, rendered by [SyncStatusScreen], previews and screenshot tests. */
 @Composable
-fun SyncStatusContent(ui: SyncStatusUi, actions: SyncStatusActions, modifier: Modifier = Modifier) {
+fun SyncStatusContent(ui: SyncStatusUi, actions: SyncStatusActions, modifier: Modifier = Modifier, snackbarHostState: SnackbarHostState? = null) {
     KvittScaffold(
         modifier = modifier,
+        snackbarHostState = snackbarHostState,
         topBar = { KvittTopAppBar(stringResource(R.string.home_sync_status_title), navigation = TopBarNavigation.Back, onNavigation = actions.onBack) },
     ) { padding ->
         val ready = ui as? SyncStatusUi.Ready
@@ -246,10 +253,11 @@ private fun PendingGroup(rows: List<LedgerRow>, actions: SyncStatusActions) {
 private fun RejectionCard(rejection: Rejection, ui: SyncStatusUi.Ready, actions: SyncStatusActions) {
     val scheme = MaterialTheme.colorScheme
     val clock = LocalKvittClock.current
-    val partnerName = ui.partner?.displayName.orEmpty()
+    // §14.4.6 "<actor>": who made the server's version; the partner when the server had none to name.
+    val actorName = (rejection.actor ?: ui.partner)?.displayName.orEmpty()
     val settlement = rejection.entityType == EntityType.SETTLEMENT
     val reason = when (rejection.reason) {
-        SyncRejectionReason.STALE -> stringResource(R.string.home_sync_reject_stale, partnerName)
+        SyncRejectionReason.STALE -> stringResource(R.string.home_sync_reject_stale, actorName)
         SyncRejectionReason.DELETED -> stringResource(R.string.home_sync_reject_deleted)
         SyncRejectionReason.VALIDATION_FAILED -> stringResource(R.string.home_sync_reject_validation)
         SyncRejectionReason.REFERENCE_NOT_FOUND -> stringResource(R.string.home_sync_reject_reference)
@@ -257,8 +265,8 @@ private fun RejectionCard(rejection: Rejection, ui: SyncStatusUi.Ready, actions:
     }
     val help = when {
         rejection.reason != SyncRejectionReason.STALE -> null
-        settlement -> stringResource(R.string.home_sync_reject_stale_help_payment, partnerName)
-        else -> stringResource(R.string.home_sync_reject_stale_help, partnerName)
+        settlement -> stringResource(R.string.home_sync_reject_stale_help_payment, actorName)
+        else -> stringResource(R.string.home_sync_reject_stale_help, actorName)
     }
     val time = DateFormatter.listDateTime(Instant.parse(rejection.rejectedAt), clock.zone, clock.today, kvittLanguage())
     val reasonLine = reason + stringResource(DesignR.string.common_separator_dot) + time

android/feature/home/src/main/kotlin/se/hagstedt/kvitt/feature/home/SyncStatusViewModel.kt

@@ -21,11 +21,13 @@ sealed interface SyncStatusUi {
     data object Starting : SyncStatusUi
 
     /**
-     * @property me the viewer and [partner] the other person: `stale` is explained with the partner's name (§14.4.6;
-     *   `Rejection` carries no actor, see the M7b report).
-     * @property failed the last attempt failed: `SyncSummary` has no such field yet, so the ViewModel passes false.
+     * @property me the viewer and [partner] the other person: `stale` names the rejection's actor, or the partner when
+     *   it has none (§14.4.6).
      */
-    data class Ready(val status: SyncStatusState, val online: Boolean, val me: User, val partner: User?, val failed: Boolean = false) : SyncStatusUi {
+    data class Ready(val status: SyncStatusState, val online: Boolean, val me: User, val partner: User?) : SyncStatusUi {
+        /** The last attempt failed while online ("Synkningen misslyckades"); offline wins, as on the pill (§3.6). */
+        val failed: Boolean get() = online && status.summary.lastAttemptFailed
+
         /** Nothing pending, nothing refused, no clock problem: "Allt är synkat". */
         val allSynced: Boolean
             get() = status.pending.isEmpty() && status.rejections.isEmpty() && !status.summary.clockSkew && !status.summary.running && online && !failed

android/feature/home/src/test/kotlin/se/hagstedt/kvitt/feature/home/HomeScreenshotTest.kt

@@ -23,11 +23,10 @@ fun homeState(scenario: FakeScenario, act: (HomeViewModel) -> Unit = {}): HomeUi
     vm.ui.value
 }
 
-/** Sync status with [scenario]; [failed] stands in for the missing `SyncSummary` field (see the M7b report). */
-fun syncState(scenario: FakeScenario, failed: Boolean = false): SyncStatusUi = withMain {
+/** Sync status with [scenario]. */
+fun syncState(scenario: FakeScenario): SyncStatusUi = withMain {
     val fakes = FakeRepositories(scenario)
-    val ui = SyncStatusViewModel(fakes.sync, fakes.connectivity, fakes.session).ui.value
-    if (failed && ui is SyncStatusUi.Ready) ui.copy(failed = true) else ui
+    SyncStatusViewModel(fakes.sync, fakes.connectivity, fakes.session).ui.value
 }
 
 /** Every state of S-4, S-16 and S-17 (design-spec §4 and PLAN-M7b §5) × light/dark × sv/en. */
@@ -54,7 +53,7 @@ val homeStates: List<ScreenState> = listOf(
     sync("S-16-sync-rejections", HomeScenarios.allRejections),
     sync("S-16-sync-clock", HomeScenarios.clockSkew),
     sync("S-16-sync-running", HomeScenarios.syncing),
-    sync("S-16-sync-error", HomeScenarios.pending, failed = true),
+    sync("S-16-sync-error", HomeScenarios.pending.copy(lastAttemptFailed = true)),
     sync("S-16-sync-offline", HomeScenarios.syncOffline),
     sync("S-16-sync-long", HomeScenarios.longSync, largeFont = true),
 )
@@ -64,8 +63,8 @@ private fun home(name: String, scenario: FakeScenario, largeFont: Boolean = fals
     return ScreenState(name, largeFont) { HomeContent(ui, HomeActions()) }
 }
 
-private fun sync(name: String, scenario: FakeScenario, largeFont: Boolean = false, failed: Boolean = false): ScreenState {
-    val ui = syncState(scenario, failed)
+private fun sync(name: String, scenario: FakeScenario, largeFont: Boolean = false): ScreenState {
+    val ui = syncState(scenario)
     return ScreenState(name, largeFont) { SyncStatusContent(ui, SyncStatusActions()) }
 }
 

android/feature/home/src/test/kotlin/se/hagstedt/kvitt/feature/home/HomeViewModelTest.kt

@@ -12,6 +12,7 @@ import se.hagstedt.kvitt.fakes.home.HomeScenarios
 import se.hagstedt.kvitt.model.DefaultCategoryKey
 import se.hagstedt.kvitt.model.SyncRejectionReason
 import se.hagstedt.kvitt.model.UpdateRepository
+import se.hagstedt.kvitt.model.UpdateCheck
 import se.hagstedt.kvitt.model.UpdateState
 
 /** Records `install()` calls; the update state is set by the test (no mocking library, CLAUDE.md). */
@@ -19,7 +20,7 @@ private class RecordingUpdates(initial: UpdateState) : UpdateRepository {
     val flow = MutableStateFlow(initial)
     var installs = 0
     override val state: Flow<UpdateState> = flow
-    override suspend fun check() = Unit
+    override suspend fun check(): UpdateCheck = UpdateCheck.UpToDate
     override suspend fun install() {
         installs += 1
     }