style: move fullscreen button to top-left corner

src/scenes/HuntingScene.js

@@ -49,8 +49,8 @@ export default class HuntingScene extends Phaser.Scene {
         const shootMessage = this.isMobile ? 'Hunt whales! Tap to shoot harpoon.' : 'Hunt whales! Click or press SPACE to shoot harpoon.';
         this.showMessage(shootMessage);
 
-        // Fullscreen button (positioned to avoid HUD)
-        createFullscreenButton(this, { x: 30, y: 580 });
+        // Fullscreen button
+        createFullscreenButton(this);
     }
 
     update() {

src/utils/fullscreen.js

@@ -6,12 +6,12 @@ import { fontSize } from './responsive.js';
  * Create a fullscreen toggle button in the corner of the screen
  * @param {Phaser.Scene} scene - The Phaser scene to add the button to
  * @param {object} options - Optional configuration
- * @param {number} options.x - X position (default: 770)
- * @param {number} options.y - Y position (default: 580)
+ * @param {number} options.x - X position (default: 30)
+ * @param {number} options.y - Y position (default: 20)
  */
 export function createFullscreenButton(scene, options = {}) {
-    const x = options.x || 770;
-    const y = options.y || 580;
+    const x = options.x || 30;
+    const y = options.y || 20;
 
     // Button background
     const btn = scene.add.rectangle(x, y, 50, 30, 0x000000, 0.6);