Smarter/more granular event handling

frontend/src/api/player.tsx

@@ -46,6 +46,15 @@ export interface SearchResponse {
   results: SearchResult[];
 }
 
+export enum ServerEvent {
+  PlaylistUpdate      = "playlist_update",
+  NowPlayingUpdate    = "now_playing_update",
+  VolumeUpdate        = "volume_update",
+  FavoritesUpdate     = "favorites_update",
+  MetadataUpdate      = "metadata_update",
+  MPDUpdate           = "mpd_update",
+}
+
 export const API = {
   async getPlaylist(): Promise<PlaylistItem[]> {
     const response = await fetch('/api/playlist');