thicker library fab icon, two-line now playing header, cached art ratio

- FAB: use the Rounded Segment icon so the glyph reads thick
- Now Playing: two-line header, an uppercase "Now playing: <type>" label (disc-title style) above the source, both left aligned
- CoverArt: remember the aspect ratio every image loads at and seed the non-square placeholder from it, so the detail hero does not start square and snap

app/src/main/kotlin/com/subtracks/ui/components/Components.kt

@@ -1,6 +1,7 @@
 package com.subtracks.ui.components
 
 import android.content.Context
+import androidx.collection.LruCache
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
@@ -36,6 +37,21 @@ import coil3.request.ImageRequest
 import coil3.request.crossfade
 import com.subtracks.data.model.CoverArtRef
 
+private const val MAX_CACHED_RATIOS = 256
+
+private object ArtworkRatioCache {
+    private val ratios = LruCache<String, Float>(MAX_CACHED_RATIOS)
+
+    fun get(cacheKey: String): Float? = ratios.get(cacheKey)
+
+    fun put(
+        cacheKey: String,
+        ratio: Float,
+    ) {
+        if (ratio > 0f && ratio.isFinite()) ratios.put(cacheKey, ratio)
+    }
+}
+
 @Composable
 fun CoverArt(
     ref: CoverArtRef?,
@@ -49,7 +65,7 @@ fun CoverArt(
     val context = LocalPlatformContext.current
     var failed by remember(ref, thumbnailRef) { mutableStateOf(false) }
     var thumbnailLoaded by remember(ref, thumbnailRef) { mutableStateOf(false) }
-    var thumbnailRatio by remember(ref, thumbnailRef) { mutableStateOf<Float?>(null) }
+    var thumbnailRatio by remember(ref, thumbnailRef) { mutableStateOf(thumbnailRef?.cacheKey?.let(ArtworkRatioCache::get)) }
     val model = remember(ref, thumbnailRef) { ref?.let { imageRequest(context, it, crossfade = thumbnailRef != null) } }
     val frameModifier =
         Modifier
@@ -74,6 +90,11 @@ fun CoverArt(
                         model = model,
                         contentDescription = null,
                         contentScale = ContentScale.Crop,
+                        onSuccess = { success ->
+                            success.painter.intrinsicSize
+                                .ratioOrNull()
+                                ?.let { ArtworkRatioCache.put(ref.cacheKey, it) }
+                        },
                         onError = { failed = true },
                         modifier = Modifier.fillMaxSize(),
                     )
@@ -150,7 +171,10 @@ private fun BoxScope.CoverArtContent(
                 onThumbnailLoaded()
                 success.painter.intrinsicSize
                     .ratioOrNull()
-                    ?.let(onThumbnailRatio)
+                    ?.let {
+                        onThumbnailRatio(it)
+                        ArtworkRatioCache.put(thumbnailRef.cacheKey, it)
+                    }
             },
             modifier = Modifier.fillMaxSize(),
         )

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

@@ -25,8 +25,8 @@ import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.Sort
 import androidx.compose.material.icons.automirrored.rounded.PlaylistPlay
+import androidx.compose.material.icons.automirrored.rounded.Segment
 import androidx.compose.material.icons.rounded.Add
 import androidx.compose.material.icons.rounded.Album
 import androidx.compose.material.icons.rounded.ArrowDownward
@@ -480,7 +480,7 @@ fun LibraryScreen(
             ) {
                 Box {
                     Icon(
-                        Icons.AutoMirrored.Filled.Sort,
+                        Icons.AutoMirrored.Rounded.Segment,
                         contentDescription = "List options",
                         modifier = Modifier.size(28.dp),
                     )

app/src/main/kotlin/com/subtracks/ui/playback/NowPlayingScreen.kt

@@ -51,9 +51,11 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.text.PlatformTextStyle
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.LineHeightStyle
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import coil3.SingletonImageLoader
 import coil3.compose.LocalPlatformContext
@@ -175,11 +177,21 @@ fun NowPlayingScreen(
                     topBar = {
                         TopAppBar(
                             title = {
+                                Column {
+                                    Text(
+                                        text = "Now playing: ${state.context?.kind?.label() ?: "library"}".uppercase(),
+                                        style = MaterialTheme.typography.labelLarge,
+                                        fontWeight = FontWeight.SemiBold,
+                                        letterSpacing = 1.sp,
+                                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                                        maxLines = 1,
+                                    )
                                     Text(
                                         text = title,
                                         maxLines = 1,
                                         overflow = TextOverflow.Ellipsis,
                                     )
+                                }
                             },
                             navigationIcon = {
                                 IconButton(onClick = onBack) {
@@ -385,6 +397,14 @@ fun NowPlayingScreen(
     }
 }
 
+private fun QueueKind.label(): String =
+    when (this) {
+        QueueKind.Album -> "album"
+        QueueKind.Playlist -> "playlist"
+        QueueKind.Song -> "song"
+        QueueKind.Songs -> "library"
+    }
+
 private fun formatTime(milliseconds: Long): String {
     val totalSeconds = (milliseconds / 1000).coerceAtLeast(0)
     val minutes = totalSeconds / 60