Make crosshair shake smooth with oscillation

- Replaced random shake with smooth sine/cosine oscillation
- Added crosshairShakeTime variable to track oscillation phase
- Uses different frequencies (3x and 2.5x) for natural circular motion
- Creates predictable, smooth shake pattern instead of jittery random
- More comfortable aiming experience while maintaining difficulty

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

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

src/scenes/HuntingScene.js

@@ -14,6 +14,7 @@ export default class HuntingScene extends Phaser.Scene {
         this.crosshairY = 300;
         this.crosshairSpeed = 5;
         this.crosshairShakeAmount = 2; // Pixels of shake
+        this.crosshairShakeTime = 0; // Timer for smooth shake oscillation
         this.useKeyboard = false; // Toggle between mouse and keyboard
     }
 
@@ -48,9 +49,10 @@ export default class HuntingScene extends Phaser.Scene {
             this.updateCrosshairMouse();
         }
 
-        // Update crosshair sprite position with shake
-        const shakeX = (Math.random() - 0.5) * this.crosshairShakeAmount * 2;
-        const shakeY = (Math.random() - 0.5) * this.crosshairShakeAmount * 2;
+        // Update crosshair sprite position with smooth shake
+        this.crosshairShakeTime += 0.15; // Increment for smooth oscillation
+        const shakeX = Math.sin(this.crosshairShakeTime * 3) * this.crosshairShakeAmount;
+        const shakeY = Math.cos(this.crosshairShakeTime * 2.5) * this.crosshairShakeAmount;
         this.crosshair.setPosition(this.crosshairX + shakeX, this.crosshairY + shakeY);
 
         // Update harpoons