Add whale hunting mini-game with crosshair mechanics

- Created HuntingScene with mouse and keyboard controls
- Crosshair can be controlled by mouse or WASD/Arrow keys
- TAB key toggles between control modes
- Whales spawn and swim across screen from both directions
- Harpoon shooting mechanic (click or SPACE)
- Collision detection and whale hit animations
- Whale oil rewards (+1 per successful hunt)
- HUD displays fuel, oil, and whales hunted
- Return to map button
- Updated MapScene to transition to HuntingScene

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/scenes/MapScene.js

@@ -159,12 +159,12 @@ export default class MapScene extends Phaser.Scene {
             this.showMessage('Not enough fuel to reach the hunting grounds! You need at least 20 units.');
             return;
         }
-        // Go to transition scene, then to map (hunting scene not yet implemented)
+        // Go to transition scene, then to hunting scene
         this.scene.start('TransitionScene', {
             inventory: this.inventory,
             destination: 'hunting',
             fuelCost: 20,
-            nextScene: 'MapScene' // Will change to 'HuntingScene' when implemented
+            nextScene: 'HuntingScene'
         });
     }