add item menus to the detail screens and now playing

Album, artist and playlist detail screens get a more button plus long-press on their song
and album rows; now playing gets a more button for the current song. Song menus can reach
the album and artist and star; the now-playing song is read from Room so its star state is
current.

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

@@ -8,6 +8,7 @@ import com.subtracks.data.model.Disc
 import com.subtracks.data.model.Song
 import com.subtracks.data.repo.LibraryRepository
 import com.subtracks.data.repo.SourceRepository
+import com.subtracks.data.source.StarType
 import com.subtracks.playback.PlaybackController
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
@@ -53,4 +54,12 @@ class AlbumDetailViewModel(
             playbackController.shuffleAlbum(sourceId.first(), albumId)
         }
     }
+
+    fun setStar(
+        type: StarType,
+        id: String,
+        starred: Boolean,
+    ) {
+        viewModelScope.launch { libraryRepository.setStar(type, id, starred) }
+    }
 }