Remove 60-second ready-status expiry so the group can always start

Ready status previously expired 60 seconds after a player checked the
box, evaluated per-player against their own timestamp. Unless every
player happened to click ready within the same 60-second window, the
earliest player's readiness would silently expire before the last one
joined, so the session could get stuck on "Waiting for all players to
be ready" indefinitely, especially after a reload re-triggered the
timeout check.

Ready state is now durable: once checked, it stays until the player
unchecks it or the whole group is simultaneously ready, at which point
the session always transitions to PLAYING regardless of how long that
took. session.timer is still only ever set once during that one-way
READY -> PLAYING transition, so a reload never restarts or desyncs the
countdown between players.

templates/game/waiting.html.twig

@@ -64,7 +64,7 @@
                         </label>
                     </div>
                     <p class="text-muted small">
-                        Note: If all players are not ready within 1 minute of you checking this, your status will be reset automatically.
+                        As soon as everyone has checked this box, the game starts automatically for everyone.
                     </p>
                 </form>
 
@@ -79,7 +79,6 @@
 <div id="mercure-config"
      data-mercure-public-url="{{ mercure_public_url|e('html_attr') }}"
      data-topic="/game/hub/{{ session.id|e('html_attr') }}"
-     data-ready-at="{{ readyAt|e('html_attr') }}"
      style="display:none">
 </div>
 
@@ -87,7 +86,6 @@
     const config = document.getElementById('mercure-config');
     const publicUrl = config.dataset.mercurePublicUrl;
     const topic = config.dataset.topic;
-    const readyAt = config.dataset.readyAt;
 
     let reloading = false;
     const reloadOnce = (eventSource) => {
@@ -113,21 +111,5 @@
             }
         };
     }
-
-    // Client-side timeout for ready status
-    if (readyAt) {
-        const timeoutMs = 61000; // 61 seconds (slightly more than server-side 60s)
-        const now = Date.now();
-        const readyAtMs = readyAt * 1000;
-        const timeElapsed = now - readyAtMs;
-        const timeLeft = timeoutMs - timeElapsed;
-
-        if (timeLeft > 0) {
-            setTimeout(() => reloadOnce(), timeLeft);
-        } else {
-            // Already timed out, reload to sync with server
-            reloadOnce();
-        }
-    }
 </script>
 {% endblock %}