Improved konami code

[earlduque]

Adding an improved version of the Konami code script with the following changes:

1. Uses e.key instead of e.keyCode (which is deprecated) with modern arrow key names
2. Automatically tracks only the last N keypresses instead of manual position tracking
3. Resets the sequence if the user pauses too long (more forgiving UX)
4. Removes event listener when widget is destroyed to prevent memory leaks
5. Uses array join comparison instead of position tracking
6. Modern variable declarations for better scoping

[am-shakeel]

Looks good