Improve Game Over Screen & Restart Logic

[Saniya-2022]

🎮 Improve Game Over Screen & Add Proper Restart Functionality

Description

This PR enhances the game over experience and fixes restart functionality, providing a professional UI and better user experience.

Issues Fixed

• Fixes Add Game Restart Option #9 - Add Game Restart Option
• Fixes Add Game Over Screen #13 - Add Game Over Screen

Changes Made

1. ✨ Enhanced Game Over Screen

• Added professional styled game over screen with dark overlay (alpha 220)
• Displays "GAME OVER!" title with red shadow effect for better visibility
• Shows final score prominently in white text
• Includes Pac-Man and ghost sprites for visual appeal
• Added always-visible yellow "Press ANY KEY to Restart!" message
• Improved overall UI/UX with better typography and layout

2. 🔧 Fixed Game Loop Behavior

• Game loop now stops immediately when game ends (prevents game state updates)
• Eliminates screen flickering that occurred in previous implementation
• Game over screen stays visible until user presses a key
• Added 500ms delay to ensure screen renders properly

3. 🎯 Improved Restart Logic

• Created dedicated restartGame() method for clean code organization
• Properly resets all game state:
  • Loads fresh map
  • Resets Pac-Man and ghost positions to starting positions
  • Resets lives to 3
  • Resets score to 0
  • Clears gameOver flag
• Safely checks if game loop is already running before restart
• Prevents edge cases with multiple restart attempts

4. 📋 Code Quality Improvements

• Removed blinking effect from restart message (message now always visible)
• Reorganized keyReleased() method for better readability
• Added proper return statements to prevent accidental command execution
• Improved code comments for clarity
• Followed Java coding standards throughout