fix(downloads): hide unknown byte totals in notifications

android/app/src/main/kotlin/com/zarz/spotiflac/DownloadService.kt

@@ -89,10 +89,14 @@ class DownloadService : Service() {
         internal const val NATIVE_REPLAYGAIN_JOURNAL_FILE = "native_replaygain_journal.json"
         internal const val NATIVE_WORKER_CONTRACT_VERSION = NativeDownloadFinalizer.NATIVE_WORKER_CONTRACT_VERSION
         internal const val NOTIFICATION_PERCENT_TOTAL = 10_000L
+        private const val LEGACY_NOTIFICATION_PERCENT_TOTAL = 100L
         internal val NATIVE_WORKER_STATE_FILE_LOCK = Any()
         internal val NATIVE_REPLAYGAIN_JOURNAL_FILE_LOCK = Any()
         
         private var isRunning = false
+
+        internal fun isPercentOnlyNotificationTotal(total: Long): Boolean =
+            total == NOTIFICATION_PERCENT_TOTAL || total == LEGACY_NOTIFICATION_PERCENT_TOTAL
         
         fun isServiceRunning(): Boolean = isRunning
         
@@ -1818,7 +1822,7 @@ class DownloadService : Service() {
 
         val visibleProgress = when {
             total <= 0L -> "indeterminate"
-            total == NOTIFICATION_PERCENT_TOTAL ->
+            isPercentOnlyNotificationTotal(total) ->
                 "percent:${(progress * 100 / total).toInt()}"
             else -> {
                 // buildNotification renders one decimal place for MB and an
@@ -1909,7 +1913,7 @@ class DownloadService : Service() {
             "Preparing download..."
         } else if (currentArtistName.isNotEmpty() && queueCount <= 1) {
             currentArtistName
-        } else if (total == NOTIFICATION_PERCENT_TOTAL) {
+        } else if (isPercentOnlyNotificationTotal(total)) {
             val progressPercent = (progress * 100 / total).toInt()
             "$progressPercent%"
         } else if (total > 0) {

android/app/src/test/kotlin/com/zarz/spotiflac/NativeWorkerPolicyTest.kt

@@ -6,6 +6,14 @@ import org.junit.Assert.assertTrue
 import org.junit.Test
 
 class NativeWorkerPolicyTest {
+    @Test
+    fun percentOnlyNotificationTotalsDoNotRenderAsBytes() {
+        assertTrue(DownloadService.isPercentOnlyNotificationTotal(10_000L))
+        assertTrue(DownloadService.isPercentOnlyNotificationTotal(100L))
+        assertFalse(DownloadService.isPercentOnlyNotificationTotal(72L * 1024L * 1024L))
+        assertFalse(DownloadService.isPercentOnlyNotificationTotal(0L))
+    }
+
     @Test
     fun rateLimitRetriesExactlyOnce() {
         assertTrue(

lib/providers/download_queue_provider_progress.dart

@@ -373,8 +373,11 @@ extension _DownloadQueueProgress on DownloadQueueNotifier {
           notifProgress = 0;
           notifTotal = 0;
         } else if (bytesTotal <= 0) {
-          notifProgress = (progressPercent * 100).toInt();
-          notifTotal = 100;
+          notifTotal = PlatformBridge.notificationPercentTotal;
+          notifProgress = (progressPercent * notifTotal)
+              .round()
+              .clamp(0, notifTotal)
+              .toInt();
         }
         final serviceStatus = notifTotal <= 0 ? 'preparing' : 'downloading';
 

lib/services/platform_bridge.dart

@@ -145,6 +145,10 @@ class _BridgeInFlight<T> {
 }
 
 class PlatformBridge {
+  /// Sentinel shared with Android's foreground service for progress reports
+  /// that contain a percentage but no byte counts.
+  static const int notificationPercentTotal = 10000;
+
   static const _channel = MethodChannel('com.zarz.spotiflac/backend');
   static const _jsonResultFileKey = '__json_file';
   static const _backgroundJsonDecodeThresholdBytes = 128 * 1024;