metadata: tint library screens from the playing track

The library accent follows the playback artwork (LibraryRoute derives it from
the current item), so pass the playing album instead of the first list entry,
which made the tab bar disagree with the miniplayer. Inset the miniplayer
progress bar when the tab bar is present, matching AppRoot.

app/src/test/kotlin/com/subtracks/ui/DemoScreenshotTest.kt

@@ -144,10 +144,10 @@ class DemoScreenshotTest {
                                 AlbumsScreen(
                                     demo.albums,
                                     demo.coverArt,
-                                    demo.artwork(demo.albums.first().coverArt),
+                                    demo.artwork(demo.nowPlayingAlbum.coverArt),
                                     modifier = Modifier.weight(1f),
                                 )
-                                demo.MiniPlayerOverlay(demo.nowPlayingSong, demo.nowPlayingAlbum)
+                                demo.MiniPlayerOverlay(demo.nowPlayingSong, demo.nowPlayingAlbum, progressInset = true)
                             }
                         }
 
@@ -195,10 +195,10 @@ class DemoScreenshotTest {
                                     onPlaylistClick = {},
                                     onSync = {},
                                     onOpenSettings = {},
-                                    artwork = demo.artwork(demo.artists.first().coverArt),
+                                    artwork = demo.artwork(demo.nowPlayingAlbum.coverArt),
                                     modifier = Modifier.weight(1f),
                                 )
-                                demo.MiniPlayerOverlay(demo.nowPlayingSong, demo.nowPlayingAlbum)
+                                demo.MiniPlayerOverlay(demo.nowPlayingSong, demo.nowPlayingAlbum, progressInset = true)
                             }
                         }
 
@@ -221,7 +221,7 @@ class DemoScreenshotTest {
                                     starredSupported = true,
                                     search = DEMO_SEARCH,
                                     onSearchChange = {},
-                                    artwork = demo.artwork(demo.searchAlbums.first().coverArt),
+                                    artwork = demo.artwork(demo.nowPlayingAlbum.coverArt),
                                     modifier = Modifier.weight(1f),
                                 )
                                 demo.MiniPlayerOverlay(demo.nowPlayingSong, demo.nowPlayingAlbum)
@@ -284,6 +284,7 @@ class DemoScreenshotTest {
     private fun DemoData.MiniPlayerOverlay(
         song: Song,
         album: Album,
+        progressInset: Boolean = false,
         modifier: Modifier = Modifier,
     ) {
         MiniPlayer(
@@ -291,6 +292,7 @@ class DemoScreenshotTest {
             positionMs = positionFor(song),
             coverArt = coverArt(album.coverArt, true),
             artwork = artwork(album.coverArt),
+            progressInset = progressInset,
             onExpand = {},
             onPlayPause = {},
             onNext = {},