feat(album): display disc groups from catalog metadata

lib/widgets/animation_utils.dart

@@ -490,10 +490,12 @@ class _CollectionHeaderSkeleton extends StatelessWidget {
             children: [
               const SkeletonBox(width: 48, height: 48, borderRadius: 24),
               const SizedBox(width: 16),
-              SkeletonBox(
-                width: screenWidth * 0.45,
-                height: 48,
-                borderRadius: 24,
+              Flexible(
+                child: SkeletonBox(
+                  width: screenWidth * 0.45,
+                  height: 48,
+                  borderRadius: 24,
+                ),
               ),
               const SizedBox(width: 16),
               const SkeletonBox(width: 48, height: 48, borderRadius: 24),

lib/widgets/disc_separator_chip.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
+import 'package:spotiflac_android/theme/mornye_theme.dart';
 
 /// "Disc N" chip with a trailing hairline, shown between disc groups in
 /// album track lists.
@@ -11,6 +12,28 @@ class DiscSeparatorChip extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
+    if (context.isMornye) {
+      return Padding(
+        padding: const EdgeInsets.fromLTRB(20, 20, 20, 8),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Divider(
+              height: 1,
+              color: MornyeTheme.metadataDividerColor(context),
+            ),
+            const SizedBox(height: 12),
+            Text(
+              context.l10n.downloadedAlbumDiscHeader(discNumber),
+              style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+                fontWeight: FontWeight.w600,
+              ),
+            ),
+          ],
+        ),
+      );
+    }
 
     return Padding(
       padding: const EdgeInsets.fromLTRB(20, 16, 20, 8),