When the last player clicked ready, toggleReady() published a
redundant 'player_ready' event on top of checkAllPlayersReady()'s
'all_ready', and the client reloaded on every message with no guard
and without closing the EventSource. Chrome kept the old page's
script (and its EventSource) alive across the overlapping reload
calls, causing repeated reconnects to the Mercure hub; Firefox
apparently tore the page down fast enough to mask it. Skip the
redundant publish server-side, and make the client reload idempotent
by tracking whether it already fired and closing the EventSource
before reloading.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
