Show friendly session status labels on the player dashboard

Players saw the raw enum value (e.g. "created") in the sessions
table, which doesn't mean anything to them. Adds SessionStatus::label()
mapping each status to a player-facing description like "Waiting for
players".

src/Game/Enum/SessionStatus.php

@@ -9,4 +9,15 @@ enum SessionStatus: string
     case PLAYING = 'playing';
     case WON = 'won';
     case LOST = 'lost';
+
+    public function label(): string
+    {
+        return match ($this) {
+            self::CREATED => 'Waiting for players',
+            self::READY => 'Waiting for players to be ready',
+            self::PLAYING => 'In progress',
+            self::WON => 'Completed - Won',
+            self::LOST => 'Completed - Lost',
+        };
+    }
 }