fix: add fake-timer tests for useQuiz timer auto-submit

[payfoxX]

closes #947

I implemented fake-timer tests for the useQuiz hook to verify the timer auto-submit functionality on expiry.

What I fixed
I added comprehensive tests that ensure the timer correctly auto-submits when it expires, that the timer clears upon completion, and that it does not run in review mode. These tests use vitest's fake timers to simulate time progression and assert the expected behavior based on the hook's API.

Issue before the fix
Before the change, the useQuiz hook's timer functionality was not tested. Specifically, there was no verification that complete() is called and isCompleted becomes true when the timer expires, that the interval is cleared on completion, or that the timer remains inactive in review mode. This lack of tests could lead to undetected bugs in the quiz completion logic, potentially causing issues such as quizzes not submitting automatically or timers running inappropriately.

Files changed

• src/hooks/tests/useQuiz.test.tsx: Added new test cases within a 'timer auto-submit on expiry' describe block, using vitest's fake timers to advance time and assert state changes. Aligned test methods with the existing hook API by using result.current.actions.startQuiz, answerQuestion, and complete, and corrected imports to use Quiz and QuestionType from '@/types/quiz' for consistency with the codebase. Included tests for auto-submit at expiry, timer clearing on completion, and review mode behavior.

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