[OA][Frontend] - Adding Cheat Detection Components to OA

[LOTaher]

Description

Now that the OA flow is in place, it is time for you to implement all the different hooks we've created to prevent candidates from cheating. This ticket in particular is going to focus on the alt + tab behavior. The hook lives in lib/hooks/useWindowUnfocused.ts. You should use this hook within the OA page. The behavior when the user alt tabs should look like the following:

Note: edit the copy to say "You can't unfocus your assessment window during the exam" instead.

It is modal that pops up and should make the rest of the window blurry as shown (do notice that the modal is different, just pay attention to the surrounding window):

This is strictly a front-end ticket, no other behavior is required. Let @LOTaher know if you have any questions!

Acceptance Criteria

• Implementation matches requirements above.