feat(metadata): show average bitrate for lossless files in the track screen

lib/screens/track_metadata_cards.dart

@@ -706,6 +706,27 @@ extension _TrackMetadataCards on _TrackMetadataScreenState {
                       ),
                     ),
                   ),
+                if (!_isBitrateFormatLabel(fileExtension) &&
+                    _audioBitrate != null &&
+                    _audioBitrate! > 0)
+                  Container(
+                    padding: const EdgeInsets.symmetric(
+                      horizontal: 12,
+                      vertical: 6,
+                    ),
+                    decoration: BoxDecoration(
+                      color: colorScheme.tertiaryContainer,
+                      borderRadius: BorderRadius.circular(20),
+                    ),
+                    child: Text(
+                      '${_audioBitrate}kbps',
+                      style: TextStyle(
+                        color: colorScheme.onTertiaryContainer,
+                        fontWeight: FontWeight.w600,
+                        fontSize: 12,
+                      ),
+                    ),
+                  ),
                 Container(
                   padding: const EdgeInsets.symmetric(
                     horizontal: 12,

lib/screens/track_metadata_screen.dart

@@ -315,11 +315,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen>
       final formatChanged =
           resolvedFormat != null &&
           resolvedFormat != normalizeAudioFormatValue(storedFormat);
-      final resolvedBitrate = _isBitrateFormatValue(resolvedFormat)
-          ? _readPlausibleBitrateKbps(
-              metadata['bitrate'] ?? metadata['bit_rate'],
-            )
-          : null;
+      // Lossless files carry an average bitrate too (computed by the backend
+      // from file size / duration) — useful for spotting fake 24-bit rips.
+      final resolvedBitrate = _readPlausibleBitrateKbps(
+        metadata['bitrate'] ?? metadata['bit_rate'],
+      );
       final resolvedDuration = readPositiveInt(metadata['duration']);
       final resolvedAlbum = metadata['album']?.toString();
       final resolvedTitle = metadata['title']?.toString();