perf(metadata): avoid SAF copies during quality probes

lib/providers/download_history_provider.dart

@@ -524,7 +524,10 @@ class DownloadHistoryNotifier extends Notifier<DownloadHistoryState> {
       lookupItems: _lookupItemsWithUpdates([updated]),
     );
     await _db.upsert(updated.toJson());
-    _bumpHistoryRevision();
+    // Swiping through older tracks can backfill several quality records in a
+    // short burst. Coalesce their DB-derived Library refreshes just like
+    // download completion writes instead of rebuilding every view per swipe.
+    _scheduleIndexBump();
   }
 
   Future<void> updateMetadataForItem({

lib/providers/download_history_provider_maintenance.dart

@@ -392,7 +392,7 @@ extension _HistoryStartupMaintenance on DownloadHistoryNotifier {
     }
 
     try {
-      final result = await PlatformBridge.readFileMetadata(filePath);
+      final result = await PlatformBridge.readDisplayAudioMetadata(filePath);
       final error = result['error'];
       if (error != null) {
         if (_isPermanentProbeError(error.toString())) {