Implement Sound Effects & Audio Feedback

Currently, there is no auditory feedback in the game. Adding sound effects enhances engagement and makes gameplay more immersive by providing instant cues for player actions and results.

### 🎯 Proposed Solution
- Add sounds for:
- Move placement (X/O click)
- Invalid moves
- Wins, losses, and draws
- Include background music (optional) and a toggle for mute/unmute in settings.
- Ensure sounds are short, non-intrusive, and pleasant.

### ✅ Expected Behavior
- Sound plays when a move is placed or invalid.
- Victory and draw outcomes trigger unique sound effects.
- Users can control audio settings directly from the game UI.
- Sound preferences persist across sessions.