Feature Request: Add Accessibility Features and Theme Switcher

The current game design lacks accessibility options such as dark mode and larger/tactile buttons, making it harder for visually impaired or younger players to enjoy. A theme switcher and accessibility improvements can significantly enhance usability.

### 🎯 Proposed Solution
- Add a **Theme Switcher** for light/dark modes.
- Introduce accessibility settings:
- Larger buttons.
- High-contrast color scheme.
- Keyboard navigation and focus indicators.
- Save theme and accessibility preferences locally.

### ✅ Expected Behavior
- Users can toggle between light and dark modes.
- Buttons are larger and accessible via keyboard.
- All UI elements meet WCAG AA contrast standards.

### 💻 Technical Notes
- Use CSS variables or Tailwind theme configuration for theming.
- Ensure ARIA roles for interactive elements.
- Use prefers-color-scheme media query for default theme detection.

### 🧪 Test Steps
1. Switch to Dark Mode → verify consistent UI styling.
2. Navigate with keyboard → ensure focus states are visible.
3. Check contrast ratio using Lighthouse Accessibility Audit.