Fix game route dumping players into the terminal for non-PLAYING sessions

GameController::index() only special-cased READY; every other status
(including a freshly-created session still waiting for players, and
even an already WON/LOST one) fell straight through to rendering the
live game terminal - which is broken there since screens/rights/pwd
are never initialized before startSession() flips CREATED -> READY.

The dashboard's "Enter Game" button links to this route regardless of
status, so any player clicking it on a CREATED session hit this
directly. Now CREATED redirects back to the dashboard with an
explanatory flash, and WON/LOST redirect to their respective pages
instead of re-rendering a dead terminal.

src/Game/Controller/GameController.php

@@ -134,6 +134,19 @@ final class GameController extends AbstractController
         // Lazily pick up readiness changes from other players since our last request
         $dashboardService->checkAllPlayersReady($session);
 
+        if ($session->getStatus() === SessionStatus::CREATED) {
+            $this->addFlash('info', 'This session is still waiting for more players to join.');
+            return $this->redirectToRoute('game_dashboard');
+        }
+
+        if ($session->getStatus() === SessionStatus::WON) {
+            return $this->redirectToRoute('game_won', ['session' => $session->getId()]);
+        }
+
+        if ($session->getStatus() === SessionStatus::LOST) {
+            return $this->redirectToRoute('game_lost', ['session' => $session->getId()]);
+        }
+
         if ($session->getStatus() === SessionStatus::READY) {
             $isReady = false;
             if ($player) {