fix(android): extract PlaylistCardCover to clear detekt LongMethod

Adding the play-button overlay in the previous commit pushed
PlaylistCard from 49 to 62 lines, two over detekt's 60-line cap.
Splitting the cover stack into its own private composable
(PlaylistCardCover) brings the outer function back under the limit
while keeping the call site readable.

Behavior identical to f17610ec; pure refactor for lint compliance.

android/app/src/main/java/com/fabledsword/minstrel/playlists/widgets/PlaylistCard.kt

@@ -60,6 +60,41 @@ fun PlaylistCard(
         color = Color.Transparent,
     ) {
         Column(modifier = Modifier.padding(horizontal = 8.dp)) {
+            PlaylistCardCover(
+                playlist = playlist,
+                onPlay = onPlay,
+                playEnabled = playEnabled,
+            )
+            Spacer(Modifier.height(8.dp))
+            Text(
+                text = playlist.name,
+                style = MaterialTheme.typography.titleSmall,
+                color = MaterialTheme.colorScheme.onSurface,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+            Text(
+                text = subtitleFor(playlist),
+                style = MaterialTheme.typography.bodySmall,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+        }
+    }
+}
+
+/**
+ * 144dp cover with the system-variant pill (top-start) and play
+ * overlay (bottom-end) stacked on top. Pulled out of [PlaylistCard]
+ * to keep that composable under detekt's 60-line LongMethod cap.
+ */
+@Composable
+private fun PlaylistCardCover(
+    playlist: PlaylistRef,
+    onPlay: (suspend () -> Unit)?,
+    playEnabled: Boolean,
+) {
     CoverTile(
         url = playlist.coverUrl,
         contentDescription = playlist.name,
@@ -92,23 +127,6 @@ fun PlaylistCard(
             }
         },
     )
-            Spacer(Modifier.height(8.dp))
-            Text(
-                text = playlist.name,
-                style = MaterialTheme.typography.titleSmall,
-                color = MaterialTheme.colorScheme.onSurface,
-                maxLines = 1,
-                overflow = TextOverflow.Ellipsis,
-            )
-            Text(
-                text = subtitleFor(playlist),
-                style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
-                maxLines = 1,
-                overflow = TextOverflow.Ellipsis,
-            )
-        }
-    }
 }
 
 /** Small label chip overlaid on a system playlist's cover. */