feat: add copy-to-clipboard functionality for answers

[Owais-Siddique-11]

Description

Added a copy-to-clipboard feature for answers/solutions to improve workflow efficiency and usability.

Changes Made

• Added one-click copy button for answers
• Integrated Clipboard API support
• Added toast feedback after successful copy
• Improved accessibility with proper labels
• Maintained responsive and consistent UI styling

Closes #233

[vercel]

@Owais-Siddique-11 is attempting to deploy a commit to the Karan Mani Tripathi 's projects Team on Vercel.

A member of the Team first needs to authorize it.

[knoxiboy]

Technical Review

Hi @Owais-Siddique-11! Thank you for your contribution to DoubtDesk.

The code changes look good. Before we can complete the technical review, approve, and merge this pull request, we have one final requirement for all contributors: Please star the DoubtDesk repository.

Once you have starred the repository, please drop a comment here saying "done" (or we will automatically detect it) and we will proceed with approving and merging your PR. Thank you.