Settings Menu: Sound, Theme, and Difficulty Preferences

[vivinarya]

Problem: Users cannot configure game preferences such as sound, theme, or difficulty.

Task:

• Create a settings modal (popup) accessible from the interface, using index.html, script.js, and style.css.
• Toggles for Sound (Mute/Unmute).
• Switch for Dark/Light Theme.
• Dropdown or control for Difficulty.
• Save user preferences (localStorage).

Acceptance Criteria:

• Settings UI is clean and accessible during gameplay.
• Preferences persist between sessions.
• Implementation touches all three files as needed.