feat: add quiz timer and improve quiz UI

[gayatripadalia]

Related Issue

Fixes #314

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Description

This PR adds a countdown timer to the quiz and improves the quiz UI to make the quiz experience more engaging and user-friendly.

Changes made

• Added a 5-minute countdown timer for quizzes.
• Automatically ends the quiz when the timer reaches zero.
• Displays the remaining time in MM:SS format.
• Timer changes to red during the last minute and pulses during the last 10 seconds.
• Added a progress bar to indicate quiz progress.
• Updated the quiz intro from "No time limit" to "5 minute time limit".
• Improved the quiz header by styling the Quiz, Question, and Score labels.

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Type of Change

• Bug fix
• New feature
• Documentation update
• UI/UX improvement
• Refactor

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Screenshots

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How Has This Been Tested?

• Tested locally using the development server.
• Verified the timer starts when the quiz begins.
• Confirmed the timer counts down correctly in MM:SS format.
• Verified the quiz automatically finishes when the timer reaches zero.
• Checked that the progress bar updates correctly.
• Confirmed all existing quiz functionality (answer selection, scoring, and results) works as expected.

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Checklist

• My code follows the project structure and conventions.
• I have tested the changes locally.
• I have linked the related issue properly.
• I have added screenshots where applicable.
• No existing functionality was broken.

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Additional Notes

This implementation introduces a quiz timer and UI enhancements while preserving the existing quiz functionality. Future improvements could include configurable time limits for individual quizzes and recording unanswered questions when the timer expires.

[vercel]

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