Contributor ui updates (simplified)

[priyanshunitr]

Addressed Issues

Fixes #142

Screenshots/Recordings

Before

After

Additional Notes

This PR improves the Contributor Profile header by:

• Replacing the redundant heading and subtitle with the contributor’s avatar and username.
• Adding a direct link to the contributor’s GitHub profile.
• Adding a Share Profile button that shares the current contributor profile URL.
• Making the back navigation more visible.
• Matching and centering the Share and Export action buttons.
• Adding a hover effect to the Export button.
• Preventing horizontal overflow on mobile devices.
• Stacking profile actions and using a two-column metrics grid on smaller screens.
• Collapsing navbar action labels into accessible icon buttons on mobile.

Verification

• All 40 automated tests pass.
• The production build completes successfully.
• Desktop, tablet, and 390px mobile layouts were manually verified.
• No new runtime errors were introduced.
• No documentation changes were required because this is a presentational UI update.

AI Disclosure

AI tools were used to assist with implementation and verification. The resulting changes were manually reviewed, tested, and validated against the issue requirements.

Checklist

• My code follows the project's code style and conventions
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
• I have read the Contributing Guidelines

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📥 Commits

Reviewing files that changed from the base of the PR and between f911298 and fa0b8b8.

📒 Files selected for processing (1)

• src/pages/ContributorProfilePage.jsx

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[Ri1tik]

I merged your PR as there was no conflict but later label-conflict happened so I reverted please reopen this PR!!