[Bug]: Snake difficulty changes score but not actual game speed

[mayurigade-hub]

What is happening?
In the Snake game, selecting Easy, Medium, or Hard changes the score multiplier, but the snake movement speed does not really change.

Why is this a problem?
Users expect Hard mode to move faster and Easy mode to move slower. Right now, difficulty mostly affects points, so the gameplay feels almost the same.

How to fix it:
Use the speed value inside the game loop. The snake should move only after enough time has passed based on the selected difficulty.

Steps to Reproduce:

1. Open the Snake game.
2. Select Easy and start the game.
3. Restart and select Hard.
4. Notice that the snake speed does not meaningfully change.

Files affected:
web-app/js/projects/snake.js

[github-actions]

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[mayurigade-hub]

Hello @steam-bell-92
Please assign under GSSoC.

[steam-bell-92]

@mayurigade-hub