Player: now-playing title with cover, start banner, one status pill; media art for everyone

The swapper sends the media's poster and banner once (`art`, Jellyfin
images or AniList by parsed name); state carries their hashes and every
member fetches them from /i/ like avatars. state.media.swapBy names who
put the media up. uosc and the standard bar show cover, title and
episode; a banner card shows before playback starts. The top-left health
pill and the waiting pill become one frosted status pill in plain words.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/desktop/test/shell_test.dart

@@ -290,12 +290,13 @@ void main() {
     expect(tester.takeException(), isNull);
   });
 
-  testWidgets('waiting pill: who is not ready, or you', (tester) async {
+  testWidgets('status pill: who is not ready, with the ready count', (tester) async {
     coord.playback.alive.value = true;
     await pumpShell(tester, const Size(1280, 800));
     online([member('a', 'Alex', ready: true), member('b', 'Bob'), member('c', 'Cleo')]);
     await tester.pumpAndSettle();
-    expect(find.text('Waiting for Bob, Cleo'), findsOneWidget);
+    expect(find.text('Waiting for Bob and Cleo'), findsOneWidget);
+    expect(find.text('1/3 ready'), findsOneWidget);
   });
 
   test('toasts: feed toasts carry the actor, the rest are the app\'s', () {