feat(model): track visited rooms on Player for the map

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/Player.java

@@ -5,7 +5,9 @@ import lombok.Setter;
 import thb.jeanluc.adventure.model.item.Item;
 
 import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
 import java.util.Optional;
+import java.util.Set;
 
 /**
  * The player avatar. Tracks the current room, an ordered inventory, and a
@@ -15,9 +17,11 @@ import java.util.Optional;
 public class Player {
 
     /** Room the player is currently standing in. */
-    @Setter
     private Room currentRoom;
 
+    /** Ids of rooms the player has entered, in first-visit order (for the map). */
+    private final Set<String> visitedRoomIds = new LinkedHashSet<>();
+
     /**
      * Inventory keyed by item id. {@link LinkedHashMap} keeps insertion
      * order for stable {@code inventory} listings while still providing
@@ -44,6 +48,17 @@ public class Player {
         }
         this.currentRoom = startRoom;
         this.gold = startGold;
+        this.visitedRoomIds.add(startRoom.getId());
+    }
+
+    /**
+     * Moves the player into a room and records it as visited.
+     *
+     * @param room the room now occupied; must not be null
+     */
+    public void setCurrentRoom(Room room) {
+        this.currentRoom = room;
+        this.visitedRoomIds.add(room.getId());
     }
 
     /**