stop poisoning the unit suite from Room teardown races

The ThemeTest failure was cross-test contamination, not a theme bug. A Room invalidation-tracker query keeps running on a cancelled flow collector after the in-memory DB is closed or finalised, throws "no such table: sources", and kotlinx-coroutines-test records it and fails the next Compose test with UncaughtExceptionsBeforeTest. Which test it lands on is just ordering/load luck.

Close repositories the way DownloadRepository already did: cancel and join the scope, so Room work cannot outlive close. Stop closing the in-memory test DBs; the DB is dropped and collected once the test releases it, instead of being torn down under a pending query. Wait for the stored ref in offlineModeStillServesDownloadedArtwork instead of asserting once, since it was waiting on a different flow than the state coverArt reads. Print full stack traces for failed tests in CI.

app/src/main/kotlin/com/subtracks/data/download/DownloadNotifier.kt

@@ -13,9 +13,11 @@ import com.subtracks.R
 import com.subtracks.data.repo.DownloadRepository
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 
 /**
  * Our own aggregated progress notification for the downloads the platform engine runs. The engine's
@@ -44,7 +46,9 @@ class DownloadNotifier(
     }
 
     internal fun close() {
+        val job = scope.coroutineContext[Job]
         scope.cancel()
+        runBlocking { job?.join() }
     }
 
     private fun build(content: DownloadNotification): Notification =

app/src/main/kotlin/com/subtracks/data/repo/SourceRepository.kt

@@ -16,6 +16,7 @@ import com.subtracks.data.source.streamLengthSuffix
 import com.subtracks.data.source.subsonic.SubsonicClient
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.Flow
@@ -25,6 +26,7 @@ import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.OkHttpClient
@@ -100,7 +102,9 @@ class SourceRepository(
     }
 
     fun close() {
+        val job = scope.coroutineContext[Job]
         scope.cancel()
+        runBlocking { job?.join() }
     }
 
     fun sources(): Flow<List<Source>> = db.sourcesDao().sources()

app/src/main/kotlin/com/subtracks/data/sync/SyncManager.kt

@@ -7,11 +7,14 @@ import com.subtracks.data.repo.SourceRepository
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 
 sealed interface SyncStatus {
     data object Idle : SyncStatus
@@ -46,6 +49,12 @@ class SyncManager(
         requests.trySend(Unit)
     }
 
+    fun close() {
+        val job = scope.coroutineContext[Job]
+        scope.cancel()
+        runBlocking { job?.join() }
+    }
+
     private suspend fun runSync() {
         if (sourceRepository.offline.value) {
             showMessage("Offline mode is on")