feat: redesign main page, get player working (mostly) with Apple Music source

web/src/ts/player/plugins/interface.d.ts

@@ -1,3 +1,6 @@
+import type {
+    Ref
+} from 'vue';
 import type {
     Song
 } from '@/ts/dtype/playlist';
@@ -91,9 +94,9 @@ export interface PlayerSourcePlugin {
     'getDuration': () => number;
 
     /**
-     * Check if source is available for playback
+     * Check if source is authorized
      */
-    'available': () => boolean;
+    'authorized': Ref<boolean>;
 
     /**
      * Called when user adds another song to the playlist via this source.