1.0 library + player settings: Jellyfin/Link/Files library with details panel, player gear, settings cards, host flag

Library: source switch, selectable cards with a details panel, one merged
Continue row, Latest grouped per series without re-releases, Link page with
previews and recent links, Files embedded. Player: gear popover in both
designs, progress line while controls hide, live hwdec. Settings rebuilt as
cards. State marks the host member (proto stays 9, unreleased); hosting
shows LAN invite addresses; window buttons in fullscreen. fadeThrough keeps
the outgoing view's state.

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

packages/server/lib/src/server_hub.dart

@@ -516,7 +516,9 @@ void mountSyncRoute(
         }
         memberId = hub.engine.applyJoin(token, session.tokens[token]!.name, hello.user.avatar);
       }
-      session.tokens[token]!.isHost = hub.isHostKey(hello.hostKey);
+      final isHost = hub.isHostKey(hello.hostKey);
+      session.tokens[token]!.isHost = isHost;
+      hub.engine.members[token]?.host = isHost;
       final activeToken = token;
       hub.sockets[activeToken] = ws;
       session.tokens[activeToken]!.onKick = (reason) async {