Fix issue where killing an enemy resulted in orb being rendered with rat sprite on top

src/rendering/__tests__/DungeonRenderer.test.ts

@@ -69,6 +69,8 @@ describe('DungeonRenderer', () => {
           setDepth: vi.fn().mockReturnThis(),
           setScale: vi.fn().mockReturnThis(),
           play: vi.fn().mockReturnThis(),
+          setPosition: vi.fn().mockReturnThis(),
+          setVisible: vi.fn().mockReturnThis(),
           destroy: vi.fn(),
         })),
         container: vi.fn().mockReturnValue({
@@ -140,4 +142,67 @@ describe('DungeonRenderer', () => {
     expect(corpse1.destroy).toHaveBeenCalledTimes(1);
     expect(corpse2.destroy).toHaveBeenCalledTimes(1);
   });
+
+  it('should render exp_orb as a circle and not as an enemy sprite', () => {
+    renderer.initializeFloor(mockWorld);
+    
+    // Add an exp_orb to the world
+    mockWorld.actors.set(99, {
+      id: 99,
+      isPlayer: false,
+      type: 'exp_orb',
+      pos: { x: 5, y: 5 },
+      speed: 0,
+      energy: 0
+    });
+
+    // Make the tile visible for it to render
+    (renderer as any).visible[5 * mockWorld.width + 5] = 1;
+
+    // Reset mocks
+    mockScene.add.sprite.mockClear();
+
+    // Mock scene.add.circle
+    mockScene.add.circle = vi.fn().mockReturnValue({
+      setStrokeStyle: vi.fn().mockReturnThis(),
+      setDepth: vi.fn().mockReturnThis(),
+      setPosition: vi.fn().mockReturnThis(),
+      setVisible: vi.fn().mockReturnThis(),
+    });
+
+    renderer.render([]);
+
+    // Should NOT have added an enemy sprite for the orb
+    const spriteCalls = mockScene.add.sprite.mock.calls;
+    // Any sprite added that isn't the player (which isn't in mockWorld.actors here except if we added it)
+    // The current loop skips a.isPlayer and then checks if type is in GAME_CONFIG.enemies
+    expect(spriteCalls.length).toBe(0);
+
+    // Should HAVE added a circle for the orb
+    expect(mockScene.add.circle).toHaveBeenCalled();
+  });
+
+  it('should render any enemy type defined in config as a sprite', () => {
+    renderer.initializeFloor(mockWorld);
+    
+    // Add a rat (defined in config)
+    mockWorld.actors.set(100, {
+      id: 100,
+      isPlayer: false,
+      type: 'rat',
+      pos: { x: 2, y: 2 },
+      speed: 100,
+      energy: 0,
+      stats: { hp: 10, maxHp: 10, attack: 2, defense: 0, level: 1, exp: 0, expToNextLevel: 0 }
+    });
+
+    (renderer as any).visible[2 * mockWorld.width + 2] = 1;
+    mockScene.add.sprite.mockClear();
+
+    renderer.render([]);
+
+    // Should have added a sprite for the rat
+    const ratSpriteCall = mockScene.add.sprite.mock.calls.find((call: any) => call[2] === 'rat');
+    expect(ratSpriteCall).toBeDefined();
+  });
 });