perf: memory and rebuild optimizations across app

- Bound Deezer cache with LRU eviction and periodic cleanup
- Configure Flutter image cache limits (240 entries / 60 MiB)
- Add ResizeImage wrapper for precacheImage calls
- Add memCacheWidth/cacheWidth to cover images across screens
- Add DownloadedEmbeddedCoverResolver as centralized cover service
- Throttle download progress notifications with dedup checks
- Normalize progress/speed/bytes values to reduce UI rebuilds
- Optimize queue list with per-item ConsumerWidget and RepaintBoundary
- Preserve derived indexes in LocalLibraryState.copyWith
- Skip non-error logs when detailed logging disabled
- Use async file stat and early-break loops in queue filters

lib/utils/logger.dart

@@ -119,10 +119,15 @@ class LogBuffer extends ChangeNotifier {
       final result = await PlatformBridge.getGoLogsSince(_lastGoLogIndex);
       final logs = result['logs'] as List<dynamic>? ?? [];
       final nextIndex = result['next_index'] as int? ?? _lastGoLogIndex;
+      final keepNonErrorLogs = _loggingEnabled;
 
       for (final log in logs) {
-        final timestamp = log['timestamp'] as String? ?? '';
         final level = log['level'] as String? ?? 'INFO';
+        if (!keepNonErrorLogs && level != 'ERROR' && level != 'FATAL') {
+          continue;
+        }
+
+        final timestamp = log['timestamp'] as String? ?? '';
         final tag = log['tag'] as String? ?? 'Go';
         final message = log['message'] as String? ?? '';
 
@@ -372,6 +377,10 @@ class AppLogger {
   }
 
   void _addToBuffer(String level, String message, {String? error}) {
+    if (!LogBuffer.loggingEnabled && level != 'ERROR' && level != 'FATAL') {
+      return;
+    }
+
     LogBuffer().add(
       LogEntry(
         timestamp: DateTime.now(),