feat(library): highlight high-bitrate quality badges

lib/utils/audio_quality_badge_policy.dart

@@ -0,0 +1,24 @@
+const highQualityBadgeBitrateThresholdKbps = 900;
+
+/// Preserves the highlighted color used by legacy 24-bit Library badges while
+/// also supporting newer labels that display a measured bitrate instead.
+bool shouldHighlightAudioQualityBadge(String quality) {
+  final normalized = quality.trim().toLowerCase();
+  if (RegExp(r'\b24(?:\s*[- ]?\s*bit|/)').hasMatch(normalized)) {
+    return true;
+  }
+
+  final kbpsMatch = RegExp(
+    r'\b(\d+(?:\.\d+)?)\s*k(?:bps)?\b',
+  ).firstMatch(normalized);
+  final kbps = double.tryParse(kbpsMatch?.group(1) ?? '');
+  if (kbps != null) {
+    return kbps > highQualityBadgeBitrateThresholdKbps;
+  }
+
+  final mbpsMatch = RegExp(
+    r'\b(\d+(?:\.\d+)?)\s*mbps\b',
+  ).firstMatch(normalized);
+  final mbps = double.tryParse(mbpsMatch?.group(1) ?? '');
+  return mbps != null && mbps * 1000 > highQualityBadgeBitrateThresholdKbps;
+}