fade the hero back button and brighten secondary text

app/src/main/kotlin/com/subtracks/ui/library/AlbumDetailScreen.kt

@@ -242,7 +242,7 @@ fun AlbumDetailScreen(
                         )
                     },
                     navigationIcon = {
-                        IconButton(onClick = onBack) {
+                        IconButton(onClick = onBack, modifier = Modifier.graphicsLayer { alpha = barFraction }) {
                             Icon(Icons.AutoMirrored.Rounded.ArrowBack, contentDescription = "Back")
                         }
                     },
@@ -310,7 +310,7 @@ private fun AlbumHeader(
             Text(
                 text = subtitle,
                 style = MaterialTheme.typography.bodyMedium,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                color = MaterialTheme.colorScheme.onBackground,
                 textAlign = TextAlign.Center,
                 maxLines = 1,
                 overflow = TextOverflow.Ellipsis,

app/src/main/kotlin/com/subtracks/ui/library/ArtistDetailScreen.kt

@@ -43,6 +43,7 @@ import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Brush
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Shadow
+import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
@@ -213,7 +214,7 @@ fun ArtistDetailScreen(
                 )
             },
             navigationIcon = {
-                IconButton(onClick = onBack) {
+                IconButton(onClick = onBack, modifier = Modifier.graphicsLayer { alpha = barFraction }) {
                     Icon(
                         imageVector = Icons.AutoMirrored.Rounded.ArrowBack,
                         contentDescription = "Back",

app/src/main/kotlin/com/subtracks/ui/library/SongsContent.kt

@@ -132,7 +132,7 @@ fun SongRow(
         supportingContent = {
             Text(
                 text = song.artist.orEmpty().ifEmpty { "\u00A0" },
-                color = if (isPlaying) MaterialTheme.colorScheme.primary else Color.Unspecified,
+                color = if (isPlaying) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.onBackground,
                 maxLines = 1,
                 overflow = TextOverflow.Ellipsis,
             )